HP ProLiant DL360p User manual

Configuring Arrays on HP Smart Array Controllers
Reference Guide
Abstract
This document is for the person who installs, administers, and troubleshoots servers and storage systems. HP assumes you are qualified in the
servicing of computer equipment and trained in recognizing hazards in products with hazardous energy levels.
Part Number: 433572-007
March 2012
Edition: 7

© Copyright 2006, 2012 Hewlett-Packard Development Company, L.P.
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and/or its affiliates.

Contents 3
Contents
Overview of array configuration tools ............................................................................................. 5
Utilities available for configuring an array ......................................................................................................5
Comparison of the utilities.............................................................................................................................5
Support for standard configuration tasks...............................................................................................6
Support for advanced configuration tasks .............................................................................................6
HP Smart Array Advanced Pack ..................................................................................................... 8
About SAAP ................................................................................................................................................8
Required hardware ......................................................................................................................................8
Option ROM Configuration for Arrays .......................................................................................... 10
About ORCA .............................................................................................................................................10
Using the ORCA menu-driven interface.........................................................................................................10
Creating a logical drive with ORCA...................................................................................................11
Installing a license key with ORCA.....................................................................................................12
Using the ORCA CLI...................................................................................................................................13
HP Online Array Configuration Utility for NetWare ........................................................................ 15
About CPQONLIN .....................................................................................................................................15
Summary of configuration procedure using CPQONLIN.................................................................................15
Operating CPQONLIN in manual configuration mode ...................................................................................15
Menu options in CPQONLIN.............................................................................................................16
Typical manual configuration procedures......................................................................................................17
Creating a new array and logical drive..............................................................................................18
Adding spare drives .........................................................................................................................18
Setting the rebuild priority or expand priority ......................................................................................19
Setting the accelerator ratio...............................................................................................................19
Expanding an array .........................................................................................................................20
Migrating RAID level or stripe size .....................................................................................................20
HP Array Configuration Utility ...................................................................................................... 22
About ACU................................................................................................................................................22
Accessing ACU in the offline environment.....................................................................................................22
Launching ACU with HP Intelligent Provisioning (Gen8 or later) ............................................................22
Launching ACU during POST (Gen8 or later) ......................................................................................23
Launching ACU from the SmartStart CD (G7 or earlier)........................................................................23
Launching ACU from an ISO image (all generations) ...........................................................................23
Accessing ACU in the online environment.....................................................................................................27
Launching ACU on a local server.......................................................................................................28
Launching ACU on a local server to configure a remote server..............................................................29
Launching ACU on a remote server to configure a local server..............................................................29
Using the ACU GUI ....................................................................................................................................30
Navigating the GUI..........................................................................................................................31
Configuration tasks...........................................................................................................................40
Diagnostics tasks..............................................................................................................................46
Wizards..........................................................................................................................................48
Using the ACU CLI .....................................................................................................................................51
Opening the CLI in Console mode .....................................................................................................52

Contents 4
Opening the CLI in Command mode ..................................................................................................52
CLI syntax........................................................................................................................................52
Typical procedures ...........................................................................................................................57
Using ACU scripting...................................................................................................................................73
Capturing a configuration .................................................................................................................73
Using an Input script.........................................................................................................................73
Creating an ACU script file ...............................................................................................................74
Script file options .............................................................................................................................75
XML support ....................................................................................................................................88
ACU scripting warning messages ......................................................................................................91
ACU scripting error messages ...........................................................................................................91
HP Array Diagnostics and SmartSSD Wear Gauge Utility................................................................ 96
About the utility..........................................................................................................................................96
Reported information ..................................................................................................................................96
Installing the utility......................................................................................................................................98
Setting up ADU Remote Service Mode..........................................................................................................99
Launching the utility in CLI mode..................................................................................................................99
Launching the utility in GUI mode.................................................................................................................99
Diagnostic report procedures.....................................................................................................................100
Viewing the diagnostic report..........................................................................................................100
Generating the diagnostic report .....................................................................................................102
Identifying and viewing diagnostic report files...................................................................................103
SmartSSD Wear Gauge report procedures .................................................................................................103
Viewing the SmartSSD Wear Gauge report ......................................................................................103
Generating the SmartSSD Wear Gauge report..................................................................................104
Identifying and viewing SmartSSD Wear Gauge report files ...............................................................105
Drive arrays and fault-tolerance methods ..................................................................................... 106
Drive arrays.............................................................................................................................................106
Effects of a drive failure ............................................................................................................................108
Fault-tolerance methods.............................................................................................................................109
RAID 0—No fault tolerance.............................................................................................................109
RAID 1 and RAID 1+0 (RAID 10).....................................................................................................110
RAID 1 (ADM) and RAID 10 (ADM) .................................................................................................111
RAID 5—distributed data guarding ..................................................................................................113
RAID 6 (ADG)—Advanced Data Guarding .......................................................................................113
RAID 50........................................................................................................................................115
RAID 60........................................................................................................................................116
Comparing the hardware-based RAID methods .................................................................................116
Selecting a RAID method.................................................................................................................117
Alternative fault-tolerance methods ...................................................................................................117
Diagnosing array problems........................................................................................................ 119
Diagnostic tools .......................................................................................................................................119
Troubleshooting resources .........................................................................................................................119
Acronyms and abbreviations...................................................................................................... 121
Documentation feedback ........................................................................................................... 123
Index....................................................................................................................................... 124

Overview of array configuration tools 5
Overview of array configuration tools
Utilities available for configuring an array
To configure an array on an HP Smart Array controller, three utilities are available:
•HP Array Configuration Utility (ACU)—An advanced utility that enables you to perform many complex
configuration tasks
•Option ROM Configuration for Arrays (ORCA)—A simple utility used mainly to configure the first logical
drive in a new server before the operating system is loaded
•HP Online Array Configuration Utility for NetWare (CPQONLIN)—A customized version of ACU for
online configuration of servers that use Novell NetWare
Before you use a utility, confirm that the utility can support the required task. View a comparison of the utilities
(on page 5).
Whichever utility you use, remember the following factors when you build an array:
•All drives grouped in a logical drive must be of the same type (for example, either all SAS or all SATA
and either all hard drives or all solid state drives).
•For the most efficient use of drive space, all drives within an array should have approximately the same
capacity. Each configuration utility treats every physical drive in an array as if it has the same capacity
as the smallest drive in the array. Any excess capacity of a particular drive cannot be used in the array
and is unavailable for data storage.
•The more physical drives configured in an array, the greater the probability that the array will
experience a drive failure during any given period.
•To guard against the data loss that occurs when a drive fails, configure all logical drives in an array with
a suitable fault-tolerance (RAID) method. For more information, see "Drive arrays and fault-tolerance
methods (on page 106)."
Comparison of the utilities
Feature ACU CPQONLIN ORCA
Interface GUI, CLI, and Scripting Menu-based Menu-based or CLI
Languages English, French, German,
Italian, Japanese, and
Spanish
English English
Source of
executable file
Software CD, web, or
embedded in the system
Software CD or Web Preinstalled in ROM of HP
Smart Array controllers
When the utility can
be used
All formats can be run in
online and offline
environments.
Any time the operating
system is running
During POST, before the
operating system is
installed
Where the utility can
be used
Any machine that uses a
supported browser
Only on the local server Only on the local server

Overview of array configuration tools 6
ORCA supports only basic configuration tasks, whereas CPQONLIN and ACU provide full-range support for
standard configuration tasks (on page 6). ACU also provides support for advanced configuration tasks (on
page 6). Some of these advanced tasks are not available in all ACU interface formats (GUI, CLI, and
Scripting).
Support for standard configuration tasks
A "+" indicates the feature or task is supported. A "–" indicates the feature or task is not supported.
Task ACU CPQONLIN ORCA
Create or delete arrays and logical drives + + +
Assign a RAID level to a logical drive + + +
Identify devices by causing their LEDs to illuminate + + –
Assign a spare drive to an array + + +
Share a spare drive among several arrays + + –
Assign multiple spare drives to an array + + –
Set the spare activation mode + – –
Specify the size of the logical drive + + –
Create multiple logical drives per array + + –
Set the stripe size + + –
Migrate the RAID level or stripe size + + –
Expand an array
+ + –
Set the expand priority, migrate priority, and accelerator ratio
+ + –
Extend a logical drive + – –
Set the boot controller + – +
Support for advanced configuration tasks
The following table uses these symbols:
+—The ACU format supports this task.
–—The ACU format does not support this task.
+/– —Support for this task varies by controller. To support this task, some controllers must have SAAP
activated by a registered license key.
To identify controller-specific feature support and SAAP requirements, see the controller user guide or the HP
website (http://www.hp.com/products/smartarray).
For more information, see "About SAAP (on page 8)."
Procedure ACU GUI ACU CLI ACU Scripting
Activate or delete license keys + + +
Configure multiple systems identically +1+1+
Configure a RAID 6 logical drive +/– +/– +/–
Configure a RAID 60 logical drive
+/– +/– +/–
Copy the configuration of one system to multiple systems –1–1+
Disable a redundant controller +2+ –
Enable or disable a physical drive write cache + + +

Overview of array configuration tools 7
Procedure ACU GUI ACU CLI ACU Scripting
HP Drive Erase (replace the content of a physical drive or logical
drive with zeros or random 0 and 1)
+/– +/– –
Identify devices by causing their LEDs to flash + + –
Move an array (copy all array data to a new array and then
delete the old array)
+/–2+/– +/–
Optimize the controller performance for video +/–2+/– +/–
Re-enable a failed logical drive + + –
Set the surface scan delay + + +
Set the preferred controller for a logical drive (in systems that
support redundant controllers)
+2+ +
Shrink an array (restripe the data on an array to occupy fewer
physical drives, then remove the excess drives from the array)
+/–2+/– +/–
Split a RAID 1 array or recombine a split array (offline only) +/– – –
1Scripting is the most efficient method for this task.
2The task is supported only from the Configuration screen.

HP Smart Array Advanced Pack 8
HP Smart Array Advanced Pack
About SAAP
SAAP is a collection of additional and advanced controller features embedded in the firmware of select
Smart Array controllers.
To access SAAP features, activate the software with a registered license key. (SAAP 1.0 is standard on the
HP Smart Array P812 Controller.)
SAAP 1.0 provides the following features:
•RAID 6 (ADG)
•RAID 60 (ADG)
•Advanced Capacity Expansion
•Mirror splitting and recombining in offline mode
•Drive Erase
•Performance optimization for video on demand
•Dual domain
SAAP 2.0 includes all v1.0 features and also provides the following additional features:
•RAID 1 (ADM)
•RAID 10 (ADM)
•Capability for moving and deleting individual LUNs
To access SAAP features, you must purchase a license key from HP. To obtain a license key, see the SAAP
product page on the HP website (http://www.hp.com/go/SAAP).
To install the license key and activate SAAP, use one of the following methods:
•Installing a license key with ORCA (on page 12)
•Installing a license key with ACU (on page 44)
•Installing a license key with ACU CLI ("Entering or deleting a license key" on page 60)
•Installing a license key with ACU Scripting ("LicenseKey, DeleteLicenseKey" on page 79)
Some SAAP features are required for advanced configuration tasks in ACU. For a list of these tasks, see
"Support for advanced configuration tasks (on page 6)."
Required hardware
For a list of Smart Array controllers that support SAAP, see the SAAP product page on the HP website
(http://www.hp.com/go/SAAP).
To support some controller features, the controller may also require a hardware configuration that includes
the following cache (array accelerator) options:

HP Smart Array Advanced Pack 9
•A cache module that is 256 MiB or larger
•A compatible battery pack or capacitor pack
To obtain these options, contact an HP authorized reseller or see the HP website
(http://www.hp.com/products/smartarray).

Option ROM Configuration for Arrays 10
Option ROM Configuration for Arrays
About ORCA
ORCA is a ROM-resident array configuration utility that executes automatically during initialization of an HP
Smart Array controller. This utility is designed to enable a logical drive to be configured on a new HP server
before the operating system is installed:
•If the boot drive has not been formatted and the boot controller is connected to six or fewer physical
drives, ORCA runs as part of the auto-configuration process when the new server is first powered up.
During this auto-configuration process, ORCA uses all of the physical drives on the controller to set up
the first logical drive. The RAID level used for the logical drive depends on the number of physical drives
(one drive = RAID 0; two drives = RAID 1+0; three to six drives = RAID 5). If the drives have different
capacities, ORCA locates the smallest drive and uses the capacity of that drive to determine how much
space to use on each of the other drives.
•If the boot drive has been formatted or if there are more than six drives connected to the controller, you
are prompted to run ORCA manually.
For more information about the auto-configuration process, see the HP ROM-Based Setup Utility User Guide
on the Documentation CD that is provided with the server.
ORCA is available in two formats:
•Using the ORCA menu-driven interface (on page 10)
•Using the ORCA CLI (on page 13)
HP ProLiant 100 Series servers do not support the CLI format. For these servers, use the menu-driven
interface.
Either format provides a quick and easy method for basic logical drive configuration. Both formats have
limited support for standard configuration tasks (on page 6). However, these few tasks are adequate if your
configuration needs are simple. For example, stripe size is predetermined by the RAID level that you choose,
and the size of the logical drive is determined automatically by the size of the physical drives that you select.
Using the ORCA menu-driven interface
1. Power up the server.
POST runs.
If the BIOS interface is in Command Line mode, change it to Auto mode:
a. Press the F9 key to open RBSU when prompted during POST.
b. Set the BIOS interface mode to Auto. Enter the following text:
set config bios interface mode 1
RBSU saves the configuration automatically.
c. Exit RBSU. Enter exit.
The server reboots, and then POST runs again.

Option ROM Configuration for Arrays 11
During POST, all controllers in the server are initialized one at a time in the current boot order sequence.
If a controller is connected to one or more hard drives, a message appears during the initialization
process for that controller, prompting you to start ORCA.
2. At the ORCA prompt for the controller that you want to configure, press the F8 key.
The ORCA main menu appears, enabling you to do the following:
oCreate, view, or delete a logical drive ("Creating a logical drive with ORCA" on page 11)
oEnter an SAAP license key ("Installing a license key with ORCA" on page 12)
Creating a logical drive with ORCA
1. Power up the server.
POST runs.
During POST, all controllers in the server are initialized one at a time in the current boot order sequence.
If a controller is connected to one or more hard drives, a message appears during the initialization
process for that controller, prompting you to start ORCA.
2. At the ORCA prompt for the controller that you want to configure, press the F8 key.

Option ROM Configuration for Arrays 12
The ORCA main menu appears.
3. Select Create Logical Drive.
The screen displays a list of all available (unconfigured) physical drives and the valid RAID options for
the system.
4. Press the arrow keys, spacebar, and Tab key to navigate the screen and set up the logical drive,
including an online spare drive, if one is required.
5. Press the Enter key to accept the settings.
6. Press the F8 key to confirm the settings and save the new configuration.
After several seconds, the Configuration Saved screen appears.
7. Press the Enter key to continue.
8. (Optional) To create additional logical drives, repeat steps 3 through 7.
9. Format the logical drive.
oIf you have not yet installed the operating system, format the logical drive when you install the
operating system.
oIf the operating system is already installed, format the logical drive as described in the operating
system documentation.
Installing a license key with ORCA
If the controller supports SAAP, you can use ORCA to install the license key and activate SAAP functionality.
For more information, see "About SAAP (on page 8)."

Option ROM Configuration for Arrays 13
To install a license key:
1. Power up the server.
POST runs.
During POST, all controllers in the server are initialized one at a time in the current boot order sequence.
If a controller is connected to one or more hard drives, a message appears during the initialization
process for that controller, prompting you to start ORCA.
2. At the ORCA prompt for the controller that you want to configure, press the F8 key.
The ORCA main menu appears.
3. Select Manage License Keys.
This option appears only if the Smart Array controller has a 256-MB, or larger, cache installed.
4. Under the License Key menu, select Add License Key.
5. Enter the license key in the space provided.
ORCA issues a notification after the license key activates successfully.
To use SAAP features, use the HP Array Configuration Utility. For more information, see "Configuration tasks
(on page 40)."
Using the ORCA CLI
1. Power up the server.
POST runs.

Option ROM Configuration for Arrays 14
If the BIOS interface is in Auto mode, change it to Command Line mode as follows:
a. Press the F9 key to open RBSU when prompted during POST.
b. In RBSU, select BIOS Serial Console & EMS>BIOS Interface Mode.
c. Change the setting to Command Line.
d. Press the Esc key to exit RBSU, and then press the F10 key to confirm that you want to exit.
The server reboots, and POST runs again.
During POST, all controllers in the server are initialized one at a time in the current boot order sequence.
If a controller is connected to one or more hard drives, a message appears during the initialization
process for that controller, prompting you to start ORCA.
2. At the ORCA prompt for the controller that you want to configure, press the F8 key.
The ORCA command line prompt appears.
3. Enter the command for the task that you want to perform. For information about command syntax and
to see a list of possible commands, enter help.
4. If you create a logical drive, format it when you install the operating system. If the operating system is
already installed, follow the instructions for formatting logical drives that are given in the operating
system documentation.

HP Online Array Configuration Utility for NetWare 15
HP Online Array Configuration Utility for
NetWare
About CPQONLIN
The HP Online Array Configuration Utility for NetWare (CPQONLIN) enables you to configure an array on
a NetWare server while the server is online.
To configure an array when the server is offline, use ACU.
To install CPQONLIN, obtain the appropriate Smart Component from the HP website
(http://www.hp.com/support) or the software CD that is provided with the controller. When prompted for
product information, enter the appropriate server model name. Installation instructions are provided with the
component.
Summary of configuration procedure using
CPQONLIN
1. At the console prompt, enter cpqonlin.
2. Press the arrow keys to scroll the highlight to the Array Configuration Utility menu item, and then press
the Enter key.
The screen displays a list of the controllers in the server.
3. Scroll to the controller that you want to configure and then press the Enter key.
oIf there are no logical drives connected to the controller, an auto-configuration wizard opens and
displays the optimum configuration for the drives on the controller. You can accept the suggested
configuration, modify just the RAID level of any logical drives, or use the Custom Configuration
option to completely reconfigure the drives manually ("Operating CPQONLIN in manual
configuration mode" on page 15).
oIf there is at least one logical drive connected to the controller, CPQONLIN continues in manual
configuration mode ("Operating CPQONLIN in manual configuration mode" on page 15). Press
the arrow, Enter, and Esc keys to navigate around the screen and set up the new logical drive. To
get online help at any time, press the F1 key.
4. When you have finished configuring the array, save the changes as prompted.
5. To make new logical drives available for data storage, format them using the instructions given in the
operating system documentation.
Operating CPQONLIN in manual configuration mode
When CPQONLIN opens in manual configuration mode, the screen displays two panels.

HP Online Array Configuration Utility for NetWare 16
•The main panel is the Logical Configuration View panel, which shows the selected controller and a tree
of all arrays, logical drives, and unassigned physical drives that are connected to the controller. (To
toggle to the physical configuration view, press the Tab key.)
•The secondary panel displays a menu of configuration options ("Menu options in CPQONLIN" on page
16) for the item that is highlighted in the Logical Configuration View panel.
To begin the configuration process, scroll the highlight to the item listed in the main panel that you want to
configure and then press the Enter key. The highlight jumps to the secondary panel, where you can continue
the configuration process using the same method (scroll to a menu item, and then press the Enter key). To
return the highlight to the previous panel at any time in the configuration process, press the Esc key.
For help, press the F1 key.
Detailed procedures for common tasks are described in "Typical manual configuration procedures (on page
17)."
Menu options in CPQONLIN
Menu options are visible only if they are applicable. For example, if you highlight the controller in the Logical
Configuration View panel and the controller does not have any unassigned physical drives, the Controller
Options menu does not display the Create New Array menu option.
•Controller Options menu (appears in the secondary panel when the controller is highlighted in the
Logical Configuration View panel)
Menu option Result of selecting the option
Controller Settings A new panel opens, displaying settings for three options:
Rebuild Priority, Expand Priority, and Accelerator Ratio.

HP Online Array Configuration Utility for NetWare 17
Menu option Result of selecting the option
Create New Array Three panels open:
•
Create Array (displays a menu with the following
options: Assign Drive, Assign Spare, Remove Drive,
and Accept Changes)
•
Physical Drives (lists the spare drives and unassigned
physical drives that are connected to the controller)
•
New Array (shows the updated physical configuration
view)
•Array Options menu (appears in the secondary panel when an array is highlighted in the Logical
Configuration View panel)
Menu option Result of selecting the option
Expand Array Three panels open:
•
Expand Array (displays a menu with the following
options: Assign Drive, Remove Spare, and Accept
Changes)
•
Physical Drives (lists the spare drives and unassigned
physical drives that are connected to the controller)
•
Expand Existing Array (shows the updated physical
configuration view)
Assign Spare A new panel opens, displaying a menu of the valid drives.
Remove Spare A new panel opens, displaying the spares.
Delete Entire Array The data and all the logical drive structures on the array
are deleted.
•Logical Drive Options menu (appears in the secondary panel when a logical drive is highlighted in the
Logical Configuration View panel)
Menu option Result of selecting the option
Delete The data and the logical drive structure on the array are
deleted.
Drive Settings A new panel opens, displaying settings for two options:
Fault Tolerance and Stripe Size.
SSP Settings* A new panel opens, displaying the Enable or Disable
option.
*This menu option is available only with the MSA1000 and MSA1500.
Typical manual configuration procedures
This section describes the procedures for the following common tasks:
•Creating a new array and logical drive (on page 18)
•Adding spare drives (on page 18)
•Setting the rebuild priority or expand priority (on page 19)
•Setting the accelerator ratio (on page 19)
•Expanding an array (on page 20)
•Migrating RAID level or stripe size (on page 20)

HP Online Array Configuration Utility for NetWare 18
Creating a new array and logical drive
1. Open CPQONLIN and select the controller that you want to configure.
The Logical Configuration View panel appears.
2. Press the Enter key.
The highlight moves to the Controller Options panel.
3. Highlight the Create New Array option, and then press the Enter key.
The screen displays three panels (Create Array, Physical Drives, and New Array), and the highlight
moves to the Create Array panel.
4. Highlight the Assign Drive option, and then press the Enter key.
The highlight moves to the Physical Drives panel.
5. Highlight a drive that you want to be part of the array, and then press the Enter key.
The New Array panel displays the added drive, and the highlight returns to the Create Array panel.
6. Repeat steps 4 and 5 until you have finished building the array.
oFor the most efficient use of drive space, select physical drives of comparable capacity.
oFor optimum system performance, select physical drives that are connected to different ports on the
controller.
oIf you intend to create a RAID 5 configuration, keep the risk of logical drive failure low by assigning
no more than 14 physical drives to the array.
oDo not select any physical drives that you want to be spare drives. Spare drives are created in a
separate procedure ("Adding spare drives" on page 18).
7. Highlight the Accept Changes menu option, and then press the Enter key.
The Create New Logical Drive panel appears.
8. Select the RAID level that you want the logical drive to use, and then press the Enter key.
9. Select the stripe size that you want the logical drive to use, and then press the Enter key.
10. Enter the capacity that you want the logical drive to have, and then press the Enter key.
11. Press the Esc key to save the settings and return to the Logical Configuration View panel.
12. To make new logical drives available for data storage, format them using the instructions given in the
operating system documentation.
Adding spare drives
Assigning one or more online spare drives to an array enables you to postpone replacement of faulty drives.
However, it does not increase the fault-tolerance level of any logical drives in the array. For example, a
logical drive in a RAID 5 configuration suffers irretrievable data loss if two of its physical drives are
simultaneously in a failed state, regardless of the number of spare drives assigned to the array.
Any drive that you want to use as a spare must meet the following criteria:
•It must be an unassigned drive or a spare for another array.
•It must be of the same type as existing drives in the array (for example, SATA or SAS).
•It must have a capacity no less than that of the smallest drive in the array.
To add a spare drive to an array:

HP Online Array Configuration Utility for NetWare 19
1. In the Logical Configuration View panel, highlight the array that needs a spare, and then press the Enter
key.
2. In the Array Options menu, highlight the Assign Spare option, and then press the Enter key.
The screen displays the Valid Spares Selection(s) panel, which displays only the drives that qualify to be
spares for the selected array. If a drive that you expect to see is not listed, it might have too small a
capacity compared to the other drives in the array. Press the Tab key to toggle to the physical
configuration view and check the drive size.
3. Highlight the drive that you want to assign as a spare, and then press the Enter key.
4. (Optional) Add more spares to the array by repeating step 3.
5. When you have finished assigning spares, press the Esc key to return the highlight to the Array Options
menu.
Setting the rebuild priority or expand priority
The settings that you use for the rebuild priority and expand priority features determine how much importance
you want an array rebuild or expansion to have relative to normal I/O operations.
•At the low priority setting, the rebuild or expansion takes place only when the controller is not busy
handling normal I/O requests. This setting has minimal effect on normal I/O operations. However, an
array that is rebuilt at this setting must operate for an extended time with possibly compromised fault
tolerance during the rebuild, and if another physical drive fails during this time, you could lose data.
•At the medium priority setting, rebuild or expansion occurs for half of the time, and normal I/O requests
are handled during the rest of the time.
•At the high priority setting, the rebuild or expansion occurs at the expense of normal I/O operations.
Although system performance is affected, this setting provides better data protection because the array
is vulnerable to drive failure for a shorter time.
To modify either of these settings:
1. In the Logical Configuration View panel, highlight the controller, and then press the Enter key.
The highlight moves to the Controller Options panel.
2. Highlight the Controller Settings option, and then press the Enter key.
The Controller Settings panel appears.
3. Highlight the rebuild priority setting that you want this controller to use, and then press the Enter key.
(This setting applies only to logical drives that have been configured with RAID 1+0, RAID 5, or RAID
6 fault tolerance because only these logical drives can be rebuilt.)
4. Repeat step 3 for the expand priority setting.
5. Press the Esc key to save the settings and return to the Logical Configuration View panel.
Setting the accelerator ratio
The setting that you use for the accelerator ratio feature determines how much of the cache memory is
allocated to read-ahead cache and how much to posted-write cache. Different applications have different
optimum settings. This setting applies only if the controller uses a battery-backed cache.
To modify the accelerator ratio:
1. In the Logical Configuration View panel, highlight the controller, and then press the Enter key.
The highlight moves to the Controller Options panel.

HP Online Array Configuration Utility for NetWare 20
2. Highlight the Controller Settings option, and then press the Enter key.
The Controller Settings panel appears.
3. Highlight the accelerator ratio setting that you want this controller to use, and then press the Enter key.
4. Press the Esc key to save the settings and return to the Logical Configuration View panel.
Expanding an array
You can increase the storage space on an array by adding physical drives. Any drive that you want to add
must meet the following criteria:
•It must be an unassigned drive.
•It must be of the same type as existing drives in the array (for example, SATA or SAS).
•It must have a capacity no less than that of the smallest drive in the array.
When you want to expand an array, allow about 15 minutes per gigabyte for the expansion to be
completed. During this time, the controller cannot perform any other expansion or migration. Performance
might be degraded slightly during the expansion, depending on the Expand Priority setting ("Setting the
rebuild priority or expand priority" on page 19). To minimize any effect on normal server operations,
expand an array during periods of low server use.
To expand an array:
1. Back up all data on the array. Although array expansion is unlikely to cause data loss, observing this
precaution provides extra data security.
2. Confirm that the cache battery is connected and fully charged.
3. In the Logical Configuration View panel, highlight the array, and then press the Enter key.
4. In the Array Options menu, highlight the Expand Array option, and then press the Enter key.
The screen displays three panels (Expand Array, Physical Drives, and Expand Existing Array), and the
highlight moves to the Expand Array panel.
5. Highlight the Assign Drive option, and then press the Enter key.
The highlight moves to the Physical Drives panel.
6. Highlight a physical drive that you want to add to the array, and then press the Enter key. (For optimum
use of drive capacity, select a drive that has the same capacity as other drives in the array.)
The highlight returns to the Expand Array panel.
7. (Optional) Repeat steps 5 and 6 to add more drives.
8. Highlight the Accept Changes option, and then press the Enter key.
9. Press the Esc key to begin the array expansion and return to the Logical Configuration View panel.
To view the progress of the array expansion, press the F3 key, and then scroll to the progress bar near the
bottom of the screen.
Migrating RAID level or stripe size
When you want to migrate the RAID level or stripe size, allow about 15 minutes per gigabyte for the
migration to be completed. During this time, the controller cannot perform any other expansion or migration.
Performance might be degraded slightly during the migration, depending on the Expand Priority and Rebuild
Priority settings ("Setting the rebuild priority or expand priority" on page 19). To minimize any effect on
normal server operations, migrate during periods of low server use.