HP 500 G2 User manual

HP Smart Array Multipath Software
User Guide
December 2005 (Fourth Edition)
Part Number 354907-004

© Copyright 2005 Hewlett-Packard Development Company, L.P.
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December 2005 (Fourth Edition)
Part Number 354907-004
Audience assumptions
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.

Contents 3
Contents
Overview..................................................................................................................................... 5
Software overview..................................................................................................................................... 5
Software distribution.................................................................................................................................. 5
Minimum requirements............................................................................................................................... 5
Supported operating systems ...................................................................................................................... 6
Microsoft feature support.................................................................................................................. 6
Linux feature support........................................................................................................................ 6
Multiple operating system support...................................................................................................... 6
Supported four-node configurations ............................................................................................................. 6
Two-server external boot configuration ............................................................................................... 6
Two-server internal boot configuration................................................................................................ 7
Two-server mixed boot configuration.................................................................................................. 7
Two-server cluster configuration......................................................................................................... 7
Three-server external boot configuration ............................................................................................. 7
Three-server internal boot configuration .............................................................................................. 8
Three-server mixed boot configuration ................................................................................................ 8
Installation and operation in Microsoft environments......................................................................... 9
Pre-installation hardware setup for Microsoft ................................................................................................. 9
Uninstalling the Smart Array Multipath software driver ................................................................................. 10
Installation for an existing 2-node cluster with Microsoft Windows 2000 ........................................................ 10
Multipath installation for Microsoft............................................................................................................. 11
Post-installation hardware setup for Microsoft.............................................................................................. 11
Microsoft browser security settings............................................................................................................. 11
Static LUN balancing............................................................................................................................... 12
Installation and operation in Red Hat Enterprise Linux 2.1 environments............................................ 14
Pre-installation configuration for Red Hat Enterprise Linux 2.1 ....................................................................... 14
Editing the active kernel ................................................................................................................. 14
Modifying the RAIDTAB configuration file ......................................................................................... 16
Multipath installation for Red Hat Enterprise Linux 2.1.................................................................................. 19
Static load (read-only) balancing in Red Hat Enterprise Linux 2.1 .................................................................. 20
Installation and operation in Red Hat Enterprise Linux 3.0 and 4.0 environments ............................... 21
Pre-installation hardware setup for Red Hat Enterprise Linux 3.0 and 4.0........................................................21
Multipath installation for Red Hat Enterprise Linux 3.0 and 4.0 ..................................................................... 21
Post-installation configuration for Red Hat Enterprise Linux 3.0 and 4.0.......................................................... 22
Static load (read-only) balancing in Red Hat Enterprise Linux 3.0 and 4.0...................................................... 23
Installation and operation in UnitedLinux environments.................................................................... 24
Pre-installation hardware setup for UnitedLinux............................................................................................ 24
Multipath installation for UnitedLinux.......................................................................................................... 24
Post-installation configuration for UnitedLinux .............................................................................................. 25
Static load (read-only) balancing in UnitedLinux .......................................................................................... 26
Troubleshooting.......................................................................................................................... 27
Problem diagnosis................................................................................................................................... 27
Problems during installation ...................................................................................................................... 27
HBA failure ............................................................................................................................................ 28
Cable failure .......................................................................................................................................... 28
Acronyms and abbreviations........................................................................................................ 29

Contents 4
Index......................................................................................................................................... 30

Overview 5
Overview
In this section
Software overview.................................................................................................................................... 5
Software distribution................................................................................................................................. 5
Minimum requirements.............................................................................................................................. 5
Supported operating systems ..................................................................................................................... 6
Supported four-node configurations ............................................................................................................ 6
Software overview
Smart Array Multipath software delivers dual path functionality and supports failover capability for a
redundant HBA in a server with redundant cabling to an HP StorageWorks Modular Smart Array 500
Generation 2 storage system. This fault-tolerant tool enhances availability in clustering and DAS solutions
with up to two servers managing up to 2 TB of stored data.
The software supports multiple I/O paths to the same logical volumes. When a path fails, the software
moves the logical drives from the failed path to the path of the redundant HBA in the same server.
Smart Array Multipath software works differently with Microsoft® and Linux products to provide specific
features that are compatible with operating system functionality.
Software distribution
Smart Array Multipath software is included with the 4-port U320 Shared Storage Module option. Smart
Array Multipath software version 2.0B and later only contains Multipath I/O deliverables for Microsoft®
Windows® operating systems and is only available for web download from the HP website
(http://h18007.www1.hp.com/support/files/server).
For Linux operating systems, refer to the procedures in this guide to configure the standard Linux drivers
for multipath usage.
Minimum requirements
Be sure that your solution consists of the following hardware:
•At least one server with two supported HBAs (Smart Array 642 adapters or future supported
adapters) with updated firmware
•A supported operating system installed on the server or MSA500 G2 storage system
•An MSA500 G2 storage system with the following:
•At least one HP StorageWorks Modular Smart Array 500 Generation 2 Controller
•A 2-Port Shared Storage Module and two SCSI cables
or
•A 4-Port Shared Storage Module and four SCSI cables
For the latest versions of firmware, refer to the HP website (http://www.hp.com/support/proliantstorage).

Overview 6
Supported operating systems
Supported operating systems include:
•Microsoft®
•Windows® 2000
•Windows® Server 2003
•Linux
•Red Hat Enterprise Linux
•UnitedLinux
For information about the most current operating system support, errata kernels, and service pack
requirements, refer to the HP website (http://www.hp.com/products/sharedstorage).
Microsoft feature support
•Static LUN balancing enables the administrator to optimize I/O by assigning specific volumes to
specific paths in the storage system. If one path fails, the storage system moves volumes to the path
for the redundant HBA for I/O management.
•Server-based PCI Hot Plug functionality supports online HBA addition and replacement.
•Logical volume hot-add functionality supports online array expansion/extension.
•ProLiant Storage Manager with the ProLiant Multipath Manager software and device manager
extension provide point-and-click multipath management.
•Configuration flexibility enables boot volumes for DAS solutions to reside on the storage system.
Linux feature support
•Static load (read-only) balancing enables the HBAs to optimize I/O with dual paths to the same
volumes in the storage system. If one HBA fails, the storage system moves volumes to the path for the
redundant HBA for I/O management.
•Depending on the operating system, servers maintain boot volumes and enable greater storage
capacity on the storage system.
Multiple operating system support
For multipath configurations with multiple operating systems, use SSP to restrict HBAs from accessing
logical volumes containing data from a different operating system. For more information about SSP, refer
to the documentation that ships with the 4-Port Shared Storage Module.
Supported four-node configurations
The following sections identify supported multipath configurations with their respective 4-Port Shared
Storage Module connections and locations for boot and data volumes. These configurations require two
or three servers attached with four SCSI cables to the MSA500 G2 storage system.
Two-server external boot configuration
All boot and data volumes reside on the MSA500 G2 storage system.

Overview 7
Server Port (bus) Boot volume location Data volume location
1 A1
B1
Storage system* Storage system
2 A2
B2
Storage system* Storage system
*Red Hat Enterprise Linux operating systems support boot volumes on servers only. For a mixed or external boot
configuration in a multiple operating system environment, always locate Linux boot volumes on servers.
Two-server internal boot configuration
Boot volumes reside on their respective servers, while data volumes reside on the MSA500 G2 storage
system.
Server Port (bus) Boot volume location Data volume location
1 A1
B1
Server 1 Storage system
2 A2
B2
Server 2 Storage system
Two-server mixed boot configuration
One boot volume resides on its respective server, while the other boot volume resides on the MSA500 G2
storage system. Both data volumes reside on the MSA500 G2 storage system.
Server Port (bus) Boot volume location Data volume location
1 A1
B1
Storage system* Storage system
2 A2
B2
Server 2 Storage system
*Red Hat Enterprise Linux operating systems support boot volumes on servers only. For a mixed or external boot
configuration in a multiple operating system environment, always locate Linux boot volumes on servers.
Two-server cluster configuration
Identical servers (hardware and software configuration) connect to the MSA500 G2 storage system. Boot
volumes reside on their respective servers, while both data volumes reside on the storage system.
Server Port (bus) Boot volume location Data volume location
1 A1
B1
Server 1 Storage system
2 A2
B2
Server 2 Storage system
Three-server external boot configuration
All boot and data volumes reside on the MSA500 G2 storage system. One server connects to two ports.

Overview 8
Server Port (bus) Boot volume location Data volume location
1 A1
B1
Storage system* Storage system
2 A2 Storage system* Storage system
3 B2 Storage system* Storage system
*Red Hat Enterprise Linux operating systems support boot volumes on servers only. For a mixed or external boot
configuration in a multiple operating system environment, always locate Linux boot volumes on servers.
Three-server internal boot configuration
Boot volumes reside on their respective servers, while data volumes reside on the MSA500 G2 storage
system. One server connects to two ports.
Server Port (bus) Boot volume location Data volume location
1 A1
B1
Server 1 Storage system
2 A2 Server 2 Storage system
3 B2 Server 3 Storage system
Three-server mixed boot configuration
Two boot volumes reside on their respective servers, while one boot volume resides on the MSA500 G2
storage system. All data volumes reside on the MSA500 G2 storage system. One server connects to two
ports.
Server Port (bus) Boot volume location Data volume location
1 A1
B1
Storage system* Storage system
2 A2 Server 2 Storage system
3 B2 Server 3 Storage system
*Red Hat Enterprise Linux operating systems support boot volumes on servers only. For a mixed or external boot
configuration in a multiple operating system environment, always locate Linux boot volumes on servers.

Installation and operation in Microsoft environments 9
Installation and operation in Microsoft
environments
In this section
Pre-installation hardware setup for Microsoft................................................................................................ 9
Uninstalling the Smart Array Multipath software driver................................................................................ 10
Installation for an existing 2-node cluster with Microsoft Windows 2000 ...................................................... 10
Multipath installation for Microsoft............................................................................................................ 11
Post-installation hardware setup for Microsoft ............................................................................................ 11
Microsoft browser security settings ........................................................................................................... 11
Static LUN balancing.............................................................................................................................. 12
Pre-installation hardware setup for Microsoft
To prepare for software installation:
1. Complete the MSA500 G2 storage system hardware installation:
NOTE: For hardware and option installation procedures, refer to the storage system user guide or the
documentation that ships with the option.
a. Install the MSA500 G2 storage system.
b. Install the 4-Port Shared Storage Module.
c. Install the MSA500 G2 controllers.
d. Update the system firmware, if needed.
2. Complete the server installation:
a. Install all hardware, including a second supported HBA. Refer to the server user guide.
IMPORTANT: The server only supports one SCSI path during installation. If the server is already cabled for
a multipath configuration, disconnect the SCSI cable connected from the redundant HBA to the storage
system.
b. Install one of the supported operating systems.
c. Reboot the server.
3. Install multipath cabling for one of the supported four-node configurations (on page 6).
4. Be sure that only one SCSI cable is connected from the server to the MSA500 G2 storage system.
During installation, the Smart Array Multipath software supports only one SCSI path per Microsoft®-
based server.
5. Power up the storage system.
Wait for the controller display to provide a “Startup Complete” message.
6. Power up one of the servers.

Installation and operation in Microsoft environments 10
Uninstalling the Smart Array Multipath software driver
CAUTION: Before uninstalling the software driver in a Microsoft® Windows® Server 2003 clustering
environment, use the Cluster Administrator to stop the cluster service on the appropriate node.
1. Power down the server.
2. Disconnect all SCSI cables from any controller in the storage system, unless the boot drive is
attached.
3. Power up the server.
4. Select Start>Settings>Control Panel.
5. Select Add/Remove Programs.
6. From the list of components, select HP Smart Array Multipath Software 2.0C.
NOTE: For Microsoft® Windows® Server 2003 only, the selection is HP Smart Array Multipath Driver.
7. Click Change/Remove.
8. Click OK.
NOTE: A Microsoft® Windows® Server 2003 system does not indicate progress during the removal. Wait
at least 10 minutes to allow the system to complete the removal.
9. Click Cancel.
10. Shut down the server.
11. Disconnect the SCSI cable from the redundant HBA.
Installation for an existing 2-node cluster with Microsoft
Windows 2000
1. Log on to one node of the cluster with an account having domain administrator privileges.
2. Open the Cluster Administrator and move all cluster groups to the second node.
3. On the first node, stop the cluster service and set the startup type to Manual.
4. Install the HP Smart Array Multipath Software. Refer to "Multipath installation for Microsoft (on page
11)."
5. Reboot as instructed.
6. Log on to Windows® 2000 with an account having domain administrator privileges.
7. Click Yes or OK for any new hardware found or installed.
8. Shut down the system. Do not reboot.
9. Install the second HBA and connect the cable from second HBA to the storage system.
10. Power up the server.
11. Log in to Windows® 2000 with an account having domain administrator privileges after the startup
completes.
12. Start the cluster service and set the startup type to Automatic.
13. Open the Cluster Administrator.
14. Move the disk groups from the second node to the first node and verify that all groups come online.
15. Repeat all steps for the second node.

Installation and operation in Microsoft environments 11
Multipath installation for Microsoft
CAUTION: Before installing Smart Array Multipath Software, be sure to uninstall any previous versions of
the software and update the HBA and MSA500 G2 controller drivers.
1. Insert the Smart Array Multipath Software CD into the CD-ROM drive of the server.
IMPORTANT: If autorun is disabled, run setup.exe from the CD.
2. To agree to the software license agreement, click Agree.
3. When the Main screen displays, select Install Multipath Software.
4. Click OK.
IMPORTANT: If HP web-based applications have not been installed on the system, the Web-based
Management Setup Wizard displays. The wizard prompts you to provide an administrator login and
password. Follow the on-screen instructions.
The CD installs the Smart Array Multipath Manager, the ProLiant Storage Manager, and the
redundancy driver.
5. When the system prompts for a reboot, remove the CD then click Cancel.
6. Shut down the server.
7. Connect the SCSI cable to the redundant HBA.
8. Power up the server.
9. After the server boots, open a browser window and enter:
https://localhost:2381
The system prompts you with a security certificate.
10. To accept the certificate and proceed to the login, select Yes.
11. Enter the administrator login and password.
The System Management Homepage displays.
12. Click the Settings tab.
13. Click Options.
14. In the Configuration Options section, select Local Access.
15. Click Save Configuration.
16. Repeat steps 1 through 15 for each server connected to the MSA500 G2 storage system.
Post-installation hardware setup for Microsoft
To prepare for software operation:
1. Reconnect the SCSI cable from the redundant HBA to the MSA500 G2 storage system.
2. Cycle the server power.
3. Repeat steps 1 and 2 for each server.
4. Use the appropriate software for multipath operations.
Microsoft browser security settings
For Windows® Server 2003, the modified version of Internet Explorer 6.0 defaults all servers to the
“Internet zone,” which enables the highest level of security. At this security level, browsing to HP
Management agents generates many security messages.

Installation and operation in Microsoft environments 12
To avoid these security messages:
1. Open Internet Explorer 6.0.
2. Select Tools>Internet Options.
3. Select the Security tab.
4. Click Local intranet.
5. Manually set the servers to the Local intranet zone by entering:
http://<servername or IP address>:2301
https://<servername or IP address>:2381
Static LUN balancing
The Smart Array Multipath software and Microsoft operating system support static LUN balancing. The
movement of drives to specific paths can be done two ways:
•Locally with a DME
•Remotely with the Smart Array Multipath found on the Smart Array Multipath Software CD
To balance LUNs with the DME:
1. From the desktop, right-click My Computer.
2. Click Manage. The Device Manager window opens.
3. Click SCSI and RAID Controllers.
4. Right-click one of the array controller icons and click Properties.
5. When the Properties window opens, click the Redundancy Configuration tab.
From the Redundancy Configuration tab, the administrator can view the following controller
information:
•Name
•Slot number
•Status
•Slot number of redundant controller
•Controller tree
6. In the controller tree, right-click one of the logical volumes and then click Switch Path. The system
moves the logical volume to the other path.
To manage your redundant configuration:
1. First-time users must install the software. Install the ProLiant Storage Manager software and Smart
Array Multipath Manager software ("Multipath installation for Microsoft" on page 11).
2. Browse to the System Management Homepage by entering:
https:\\<name of server>:2381
IMPORTANT: If you encounter numerous security messages on a Microsoft® Windows® Server 2003
platform, review the Microsoft browser security settings (on page 11).
3. To accept the security certificate, click Yes. The system may prompt for the administrator password
established during the original software installation. The System Management Homepage opens.
4. Click the Home tab.
5. Select ProLiant Storage Manager. A new window opens.
6. Click the appropriate controller on the Device View tab.
7. Click Multipath Management. The Multipath Management and Configuration screen displays.

Installation and operation in Microsoft environments 13
8. From the Multipath Management and Configuration screen, do one of the following:
•To move all drives from the current path to the redundant path, click the link for the controller
and select Switch All Paths. The system moves all drives to the redundant path.
•To move a drive from one path to the redundant path, click the link for the drive and select
Switch Path.
IMPORTANT: After establishing a redundant configuration and adding a logical volume, use Windows®
Disk Manager to detect the new volume.

Installation and operation in Red Hat Enterprise Linux 2.1 environments 14
Installation and operation in Red Hat Enterprise
Linux 2.1 environments
In this section
Pre-installation configuration for Red Hat Enterprise Linux 2.1...................................................................... 14
Multipath installation for Red Hat Enterprise Linux 2.1 ................................................................................ 19
Static load (read-only) balancing in Red Hat Enterprise Linux 2.1................................................................. 20
Pre-installation configuration for Red Hat Enterprise Linux
2.1
Before installing Smart Array Multipath software on a server with a Linux Red Hat operating system:
•Create a new Linux kernel that recognizes the multipath hardware configuration.
•Modify the raidtab configuration file to be sure it contains the appropriate information.
Editing the active kernel
To configure the system for multipath operations, HP recommends the following steps:
1. Modify the makefile.
2. Overwrite the active config file.
3. Edit the .config and make the kernel.
4. Insert the new kernel into the GRUB or LILO boot-loader.
The procedures in this section provide examples for all these basic steps.
Alternatively, you can install the modules without rebuilding the kernel.
IMPORTANT: Modules not installed in a kernel are not loaded at boot time, requiring you to remake
modules after every power cycle or reboot. HP recommends that you install the modules into the kernel using
the steps in this section.
Modifying the Makefile
IMPORTANT: The following procedure is for Linux Red Hat only.
To modify the Makefile:
1. Identify the name of the active kernel:
a. At the root level of the kernel source tree (usually /usr/src/linux-xxx), enter:
uname -a
b. Remember this name for use in later procedures.
2. Use an editor to modify the Makefile. For example, enter:
vi Makefile

Installation and operation in Red Hat Enterprise Linux 2.1 environments 15
3. In the EXTRAVERSION field, replace the current value (typically -3.ecustom) by entering:
E3.multipath
NOTE: Do not use the same name suffix as the active kernel. This naming ensures that any misconfiguration
does not harm the current configuration.
Overwriting the active .config file
IMPORTANT: Before overwriting any file, create a backup of the original file.
To overwrite the active .config file for Red Hat operating systems:
1. Locate the specific .config file for the modified kernel:
a. From the root level of the kernel source, enter:
cd configs
b. Identify the appropriate .config file by name, for example:
2.4.9-i686-enterprise.config
2. Copy the kernel to the root level of the kernel source and overwrite the active .config file. Enter:
cp kernel-2.4.9-i686-enterprise.config ../.config
3. When prompted to overwrite the existing file, enter:
y
Editing the .config file and making the kernel
To edit the .config file:
1. Open the configuration menu. Enter:
make menuconfig
2. Select Multi-device support (RAID and LVM).
3. Select RAID support.
4. Be sure that the RAID support option is checked with an asterisk. If it is not checked, use the space
bar to cycle through the settings until an asterisk appears next to the option.
5. Select Multipath I/O support.
6. Be sure that the Multipath I/O support option is set as a module. If it is not set as a module, use the
space bar to cycle through the settings until an “M” appears next to the option.
7. Press the Esc key twice to exit the menus.
8. When prompted to save the new kernel configuration, press the Enter key to select Yes.
9. Make the kernel:
a. From the root level, enter:
mrproper
make dep
make bzImage
make modules
make modules_install
b. Wait for the kernel to be made. Depending on the hardware configuration, this process can last
up to 30 minutes.
10. Insert the new kernel into GRUB or LILO.

Installation and operation in Red Hat Enterprise Linux 2.1 environments 16
a. Copy the new kernel boot image to the /boot directory (use the Tab key to autocomplete
directory names or display possible options). Name the boot image vmlinuz-xxxx where xxxx is
the kernel version number with the name you used in the very first step (ex., vmlinuz-2.4.9-
Emultipath).
cp /usr/src/linux-xxx/arch/ixxx/boot/bzImage /boot/vmlinuz-xxxxx
b. Make the boot image bootable:
mkinitrd vmlinuz-xxxx xxxxx
c. Update the GRUB or LILO configuration file to include the new kernel, by doing one of the
following:
•To update GRUB, edit /boot/grub/menu.lst in a text editor, copy one of the entries and change
the values to match those of the new kernel boot image and the title GRUB will use to display.
•For LILO, edit the /etc/lilo.conf by copying one of the entries and changing the values to match
those of the new kernel boot image and the title LILO will use to display. To apply the new
configuration, run the following command:
/sbin/lilo
The new kernel is ready for use.
11. Reboot and select the new kernel at the GRUB or LILO prompt. If the new kernel does not work
properly, select the original kernel to boot from and remake the kernel or reconfigure the operating
system.
Installing the module without modifying the kernel
1. Load the module. Enter:
insmod multipath
2. Verify that the module is installed and loaded by listing all modules. Enter:
lsmod
The kernel is now ready for multipath operations, but to support multipath, you must enter these
commands each time the server is restarted.
Modifying the RAIDTAB configuration file
To perform multipath operations with a Linux operating system, a raidtab configuration file must be
present. Use the instructions in the following sections to be sure the raidtab configuration file contains the
appropriate information.
RAIDTAB terms
Observe the following definitions for raidtab terms:
•raiddev—introduces the configuration for a particular device
•nr-raid-disks—the number of raid disks in the array; specified in the /dev/cciss directory
•persistent-superblock—must be set to 1 if an md device is to be mounted/used during a reboot
•chunk-size—sets the stripe size in bytes, in the power of 2
•device—the physical device that makes up the RAID array
•raid-disk—the index of the device in the RAID array
For more information, refer to the operating system documentation.

Installation and operation in Red Hat Enterprise Linux 2.1 environments 17
Sample RAIDTAB configuration file
The following raidtab sample file is for a multipath configuration with three partitions (/dev/md0,
/dev/md1, and /dev/md2) where each md device represents a partition on the device. If another
partition is needed, add it as /dev/md3 with the same characteristics as the preceding partitions.
The limit for number of partitions is four primary partitions. However, creating one of the four partitions as
a type “type 0xf” Win 95 Ext’d (LBA) partition enables you to create extended logical partitions inside of
the primary partition. Inside of the extended partition, you can create additional Linux partitions.
The raidtab configuration file must reside in the /etc directory. The contents of /etc/raidtab should
resemble the following:
raiddev /dev/md0
raid-level multipath
nr-raid-disks 2
persistent-superblock 1
chunk-size 8
device /dev/cciss/c0d2p1
raid-disk 0
device /dev/cciss/c1d2p1
raid-disk 1
raiddev /dev/md1
raid-level multipath
nr-raid-disks 2
persistent-superblock 1
chunk-size 8
device /dev/cciss/c0d2p2
raid-disk 0
device /dev/cciss/c1d2p2
raid-disk 1
raiddev /dev/md1
raid-level multipath
nr-raid-disks 2
persistent-superblock 1
chunk-size 8
device /dev/cciss/c0d2p3
raid-disk 0
device /dev/cciss/c1d2p3
raid-disk 1
Completing the Linux multipath setup
After a valid raidtab file is created in the /etc directory, verify that the correct drivers and modules are
loaded.
1. Verify that the md and multipath drivers are loaded, either statically or by a module load. Enter:
lsmod

Installation and operation in Red Hat Enterprise Linux 2.1 environments 18
This command reveals which modules are running. Examining the boot-time messages reveals the
static loaded drivers.
IMPORTANT: If you have made configuration changes to the kernel (including the multipath or /dev/md
driver) and have not rebooted from the new kernel, you must reboot before continuing. Red Hat typically
includes the md driver in the kernel.
2. Verify that the md driver is in the kernel. Enter:
dmesg | grep md | more
This command shows the boot-time messages. If the md driver was loaded, several messages should
appear, similar to the following messages:
md: md driver version X.X
md: Autodetecting RAID arrays
md: autorun…
md: …autorun DONE
3. If the multipath driver was built as a module but not loaded, load the module. Enter:
insmod multipath
This command loads the driver. If the driver does not load the multipath module, rebuild the module.
4. After verifying loaded drivers, make the raid files. For the sample partition table in the "Sample
RAIDTAB Configuration File (on page 17)” section, enter:
mkraid /dev/md0
mkraid /dev/md1
mkraid /dev/md2
mkraid /dev/md3
CAUTION: Do not use Fdisk or mkraid to create any other partitions on this logical drive. This action
results in data corruption and data loss.
5. If mkraid responds that the partition contains existing data, do the following:
a. Force the mkraid to run. Enter:
mkraid – f
b. Make filesystems on the raid devices. Enter:
mkfs –t ext2 /dev/md0
mkfs –t ext2 /dev/md1
mkfs –t ext2 /dev/md2
mkfs –t ext2 /dev/md3
mkfs –t ext2 /dev/md4
IMPORTANT: The example in step 5b uses ext2 because known bugs in the ext3 filesystem can cause
data corruption.
6. The multipath RAID device should be functioning. To mount the device /dev/md0, enter:
mount /dev/md0 /spare_filesystem
If necessary, you can stop or start the RAID device with the following commands:
•To stop the RAID device, enter:
raidstop /dev/md0
This command may need to start the md device after a reboot. Place the command in the rc /etc
configuration files for mounted filesystems at boot time.

Installation and operation in Red Hat Enterprise Linux 2.1 environments 19
•To start the RAID device, enter:
raidstart /dev/md0
This command can be placed in shutdown scripts in /etc.
For more information, refer to the operating system documentation.
Pre-installation hardware setup for Red Hat Enterprise Linux 2.1
To prepare for software installation:
1. Complete the MSA500 G2 storage system hardware installation:
NOTE: For hardware and option installation procedures, refer to the storage system user guide or the
documentation that ships with the option.
a. Install the MSA500 G2 storage system.
b. Install the 4-Port Shared Storage Module.
c. Install the MSA500 G2 controllers.
d. Update the system firmware, if needed.
2. Complete the server installation:
a. Install all hardware, including a second supported HBA. Refer to the server user guide.
b. Install one of the supported operating systems.
c. Reboot the server.
3. Install multipath cabling for one of the supported four-node configurations (on page 6).
4. Power up the storage system.
Wait for the controller display to provide a Startup Complete message.
5. Power up one of the servers.
Multipath installation for Red Hat Enterprise Linux 2.1
Use the following procedure for supported versions of Red Hat operating systems.
IMPORTANT: Red Hat Enterprise ES/AS users must obtain the RPM and DDI files from the OS base media.
To use the Smart Array Multipath Software with a Linux operating system, download the required driver
RPM.
To download the driver RPM:
1. Insert the Smart Array Multipath Software CD into the CD-ROM drive of the server.
2. Open a console prompt.
3. Mount the CD-ROM.
4. Change to the Linux directory.
5. List the contents of the directory and select the proper RPM for the current operating system.
6. Install the proper RPM using the following command:
rpm -ihv cpq_cciss_<os version>.i386.rpm
7. After successful installation, reboot the server.
8. Repeat steps 1 through 7 for each server connected to the MSA500 G2 storage system.

Installation and operation in Red Hat Enterprise Linux 2.1 environments 20
Static load (read-only) balancing in Red Hat Enterprise
Linux 2.1
The Smart Array Multipath software and Linux operating system support static load (read-only) balancing
functionality. To create, add, or extend logical volumes, use ACU Version 7.10 or later. Locate ACU on
the SmartStart CD. Refer to the HP Array Configuration Utility User Guide on the SmartStart CD or refer to
the HP website (http://www.hp.com).