XtendLan xl-raid-2804issa Manual

XL-RAID-2804ISSA
iSCSI – SATA II SUBSYSTEM
Installation and Configuration
Manual
Revision 1.0

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Table of Contents
Chapter 1 Introduction ........................................................................................... 5
1.1 Key Fea t ures ............................................ ............................................................... ............................................ . 6
1.2 Technical S pecifi ca ti ons ...................... .......... ............................................................... .................................. . 7
1.3 Terminology ............................................. ............................................................... ................... ........................ . 9
1.4 RAID Concepts ........................................... ............................................................... ..................................... . 11
Chapter 2 Getting Started ................................................................................... 16
2.1 Pa c k a gi ng , Shipment and Delivery ........................ ............................................................... ................. . 16
2.2 U npack i ng the S ubsy stem ........................ .......... .............................................................. ......................... . 16
2.3 I den t ifyi ng Parts of the XL-RAID-2804ISSA S ubsys t em
.......... .............................................................. . 17
2.3.1 Front V iew ............................................ ............................................................... .................................... . 17
2.3.2 Rear View ............................................. .......................................... ..................... ..................................... . 17
2.3.3 EnvironmentalStatus LED s.............................. .............................................................. ................... . 19
2.3.4 Smart F unction Panel .............. .................... ............................................................... ........................ . 20
2.4 Connecting iSCSI Subsystem to Your Network .............. ............................................................... .... 20
2.5 Power i n g On ............................................. ............................................................... ....................................... . 21
2.6 I nstalling Hard Drives .................................. ............................... ................................ ................................. . 21
2.6.1 HDD Status In d ic a t or ................................... .............................................................. ......................... . 22
2.7 iSCSI Introduction ...... ................................ ............................................................... .................................... . 23
2.8 Management Methods ...................................... ......................................................... ...... .......................... . 24
2.8.1 Web GU I............................................... ............................................................... ..................................... . 24
2.8.2 Console Serial Port ....................... ............ ............................................................... ............................ . 25
2.8.3 Remote Control – Secure Shell .......................... .............................................................. .............. . 25
2.9 Enclosure............................................... ............................................................... ............................................. . 26
2.9.1 LCDControl Module (LCM) .............................. .................. ............................................. ................ . 26
2.9.2 System B u zzer ......................................... ............................................................... ................................ . 27
Chapter 3 Web GUI Guideline ............................................................................ 28
3.1 XL-RAID-2804ISSA GUI Hierarchy
.............................. ............................................................... ..................... . 28
3.2 Lo g i n ....... ............................................ ............................................................... ................................................. . 29
3.3 Quick I nstall ........................................... ................................ ............................... ........................................... . 30
3.4 System C onfi g u ra tion ..................................... .............................................................. ............................... . 32
3.4.1 System N ame ........................................... ............................................................... ............................... . 32
3.4.2 IP add r ess ............................................ ............................................ ................... ..................................... . 33
3.4.3 Language .............................................. ............................................................... .................................... . 33
3.4.4 Login Config ....... ................................... ............................................................... .................................. . 34

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3.4.5 Passw ord .............................................. ........................................................ ....... ..................................... . 34
3.4.6 Date.................................................. ............................................................... ........................................... . 34
3.4.7 Mail ..................... ............................. ............................................................... ........................................... . 35
3.4.8 SNM P.................................................. ...................................................... ......... ........................................ . 35
3.4.9 Me ssenger ............................................. ............................................................... ................................... . 36
3.4.10 System Log S erv e r ......... ........................... ............................................................... .......................... . 36
3.4.11 Event Log ............................................ ............................................................... ......... .......................... . 37
3.5 iSCSI Config ............................................ ............................................................... .......................................... . 38
3.5.1 Entity Property ............................ ........... ............................................................... ................................. . 38
3.5.2 NIC................................................... ............................................................... ................... ......................... . 39
3.5.3 N ode .................................................. ............................................................... ......................................... . 40
3.5.4 Session ..................................... .......... ............................................................... ........................................ . 41
3.5.5 CHAP Account .......................................... ............................................................... ............ .................. . 41
3.6 Volume Co n f ig ura t io n ..................................... .............................................................. .............................. . 42
3.6.1 Volume Relationship Dia gram ............................ ...... ........................................................ .............. . 42
3.6.2 Physical Disk ......................................... ............................................................... ................................... . 43
3.6.3 Volume Group .......................................... ............................................................... .............................. . 45
3.6.4 User Data V olu m e ...................................... ............................................. .................. ........................... . 47
3.6.5 Cache Volu m e.......................................... . .............................................................. ............................... . 48
3.6.6 Logical Unit N u mb er................. .................. . .............................................................. ......................... . 49
3.6.7 Examples .............................................. ............................................................... ................... .................. . 50
3.7 Enclosure Man age m ent .................................... ............................................................... ........................... . 60
3.7.1 SES Configuration ..................................... ........... .................................................... ............................ . 60
3.7.2 Hardware Monitor....................................... .............................................................. ........................... . 61
3.7.3 Hard Drive S.M.A.R.T. Function S u pport ................. .............................................................. ....... 62
3.7.4 UPS ................................................... ............................................................... ...... ..................................... . 63
3.8 System M ain t ena nce ...................................... ............................................................... ............................... . 64
3.8.1 Upgrade .................................... ........... ............................................................... ..................................... . 64
3.8.2 I nfo .................................................. ............................................................... .............. .............................. . 65
3.8.3 Reset to Default ...................................... ............................................................... ............................... . 65
3.8.4 Config Import & Ex p ort .......................... ...... ............................................................... ...................... . 65
3.8.5 S h u t d own .............................................. ............................................................... ................................... .. 67
3.9 Lo go u t.................................................. . .............................................................. ............................................... . 67
Chapter 3 Advanced Operation .......................................................................... 68
4.1 Re buil d ................................................. ............................................................... ............................................... . 68
4.2 VG Migration and E x pansion ........... ................... ............................................................... ...................... . 70
4.3 UDV E xt ension ........................................... ............................................................... ...................... ................ . 72
4.4 Snapshot /R o llback ...................................... ............................................................... .................................. . 73
4.4.1 Create Snapshot Volume ................................ ........ ....................................................... ................... . 73

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4.4.2 Auto Snaps h ot ......................................... ............................................................... ............................... . 75
4.4.3 Rollback .............................................. ............................................................... ....................................... . 75
4.5 Disk Ro a min g ............................................ ....................................... ........................ ....................................... . 76
4.6 Support Microsoft MPIO and MC /S......................... ............................................................... .............. . 76
Appendix ..................................................................................................................... 77
A. Cer tific a t i on Lis t ....................................... ............................................................... ......................................... . 77
B. Event No t ifica t io ns ...................................... ............................................................... ..................................... . 79
C. K no wn Is s ues............................................. . ......................... ..................................... ......................................... . 83
D. Microsoft iSCSI Initiator ................................ ............................................................... ................................ . 83
E. Tru nk in g / LACP Setup I nstr uc tions ......................... ............................................................... .................... . 87
F. MPIO and MC/S Setup Instr uc tion s ......................... ...................................................... ......... ................. . 96
G. QLogic QLA4010C Setup I nstr uc ti ons ....................... ............................................................... ............. 111
H. I nstall ati o n Steps for Large Volume (TB ) .................. ................ .............................................. ............. 116

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Chapter 1 Introduction
The XL-RAID-2804ISSA RAID Subsystem
XL-RAID-2804ISSA connects to the host system in iSCSI interface. It can be configured to any
RAID level. XL-RAID-2804ISSA provides reliable data protection for servers and the RAID 6
function is available. The RAID 6 function allows two HDD failures without any impact on the
existing data. Data can be recovered from the remaining data and parity drives. (Data can be
recovered from the rest disks/drives.)
Snapshot-on-the-box is a fully usable copy of a defined collection of data that contains an
image of the data as it appeared at the point in time, which means a point-in-time data replication.
It provides consistent and instant copies of data volumes without any system downtime. XL-RAID-
2804ISSA Snapshot-on-the-box can keep up to 32 snapshots for all data volumes. Rollback
feature is provided for restoring the previously-snapshot data easily while continuously using the
volume for further data access. The data access is regular as usual including read/write without
any impact to end users. The "on-the-box" terminology implies that it does not require any
proprietary agents installed at host side. The snapshot is taken at target side and done by XL-
RAID-2804ISSA. It will not consume any host CPU time thus the server is dedicated to the specific
or other application. The snapshot copies can be taken manually or by schedule every hour or
every day, depends on the modification.
XL-RAID-2804ISSA is the most cost-effective disk array subsystem with completely integrated high-
performance and data-protection capabilities which meet or exceed the highest industry standards,
and the best data solution for small/medium business users.

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1.1 Key Features
2 x GbE ports support independent access, fail-over or load-balancing (802.3ad port
trunking, LACP)
Supports iSCSI jumbo frame
Supports Microsoft Multipath I/O (MPIO)
Supports RAID levels 0, 1, 0+1, 3, 5, 6, 10, 30, 50, 60 and JBOD
Local N-way mirror: Extension to RAID 1 level, N copies of the disk.
Global and dedicated hot spare disks
Write-through or write-back cache policy for different application usage
Dedicated or shared cache allocation for volume usage
Supports greater than 2TB per volume set (64-bit LBA support)
Supports manual or scheduling volume snapshot (up to 32 snapshot)
Snapshot rollback mechanism
Online volume migration with no system down-time
Online volume expansion
Instant RAID volume availability and background initialization
Supports S.M.A.R.T, NCQ and OOB Staggered Spin-up capable drives

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1.2 Technical Specifications
Form Factor: 2U 19-inch rackmount chassis
RAID processor: Intel IOP341 64-bit
RAID Level: 0, 1, 0+1, 3, 5, 6, 10, 30, 50, 60 and JBOD
N-way mirror (N copies of the disk)
Cache memory: 512MB ~ 2GB DDR II
No. of channels (host + drive): 2 + 8
Host bus interface: 1Gb/s Ethernet
Drive bus interface: 3Gb/s SATA II
Hot-swap drive trays: Eight (8) 1-inch trays
Host access control: Read-Write & Read-Only
Supports CHAP authentication
802.3ad port trunking, LACP support
Jumbo frame support
Maximum logical volume: up to 256
Maximum host connection: up to 32
Maximum host clustering: up to 8 for one logical volume
Manual/scheduling volume snapshot: up to 32
Snapshot rollback mechanism support
Supports Microsoft Multipath I/O (MPIO)
Global/dedicated cache configurable by volume
Global and dedicated hot spare disks
Online Volume migration
Online Volume sets expansion
Configurable stripe size
Instant RAID volume availability and background initialization support
Supports over 2TB per volume
Online consistency check
Bad block auto-remapping
S.M.A.R.T. support

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New disk insertion / removal detection
Auto volume rebuild
Array roaming
Audible alarm
Password protection
UPS connection
Hot-swap power supplies: Two (2) 350W power supplies w/PFC
Cooling fans: 2
Battery backup(Option)
Power requirements: AC 90V ~ 264V full range, 8A ~ 4A, 47Hz ~ 63Hz
Environmental
Relative Humidity: 10% ~ 85% Non-condensing
Operating Temp: 10oC ~ 40oC (50oF ~ 104oF)
Physical Dimensions: 88(H) x 482(W) x 650(D)mm
Weight: 12.5 kgs (without drives)

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1.3 Terminology
The document uses the following terms:
RAID
RAID is the abbreviation of “Redundant Array of Independent Disks”.
There are different RAID levels with different degree of the data
protection, data availability, performance to host environment.
PD
The Physical Disk belongs to the member disk of one specific volume
group.
VG
Volume Group. A collection of removable media or physical disks. One VG
consists of a set of UDVs and owns one RAID level attribute.
UDV
User Data Volume. Each VG could be divided into several UDVs. The UDVs
from one VG share the same RAID level, but may have different volume
capacity.
CV
Cache Volume. XL-RAID-2804ISSA uses the on board memory as cache.
All RAM (except for the part which is occupied by the controller) can be
used as cache. User can divide the cache for one UDV or sharing among
all UDVs. Each UDV will be associated with one CV for data transaction.
Each CV could be assigned different cache memory size.
LUN
Logical Unit Number. A logical unit number (LUN) is an unique identifier
used on a iSCSI connection which enables it to differentiate among
separate devices (each of which is a logical unit).
GUI
Graphic User Interface.
RAID width,
RAID copy,
RAID row
(RAID cell in
one row)
RAID width, copy and row are used to describe one VG.
E.g.:
1. One 4-disk RAID 0 volume: RAID width= 4; RAID copy=1;
RAID row=1.
2. One 3-way mirroring volume: RAID width=1; RAID copy=3;
RAID row=1.
3. One RAID 10 volume over 3 4-disk RAID 1 volume: RAID
width=1; RAID copy=4; RAID row=3.
WT
Write-Through cache write policy. A caching technique in which the
completion of a write request is not signaled until data is safely stored on
non-volatile media. Each data is synchronized in both data cache and the
accessed physical disks.
WB
Write-Back cache write policy. A caching technique in which the
completion of a write request is signaled as soon as the data is in cache
and actual writing to non-volatile media occurs at a later time. It speeds
up system write performance but needs to bear the risk where data may
be inconsistent between data cache and the physical disks in one short
time interval.

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RO
Set the volume to be Read-Only.
DS
Dedicated Spare disks. The spare disks are only used by one specific VG.
Others could not use these dedicated spare disks for any rebuilding
purpose.
GS
Global Spare disks. GS is shared for rebuilding purpose. If some VGs need
to use the global spare disks for rebuilding, they could get the spare disks
out from the common spare disks pool for such requirement.
DC
Dedicated Cache.
GC
Global Cache.
DG
DeGraded mode. Not all of the array’s member disks are functioning, but
the array is able to respond to application read and write requests to its
virtual disks.
S.M.A.R.T.
Self-Monitoring Analysis and Reporting Technology.
WWN
World Wide Name.
HBA
Host Bus Adapter.
MPIO
Multi-Path Input/Output.
MC/S
Multiple Connections per Session
S.E.S
SCSI Enclosure Services.
NIC
Network Interface Card.
iSCSI
Internet Small Computer Systems Interface.
LACP
Link Aggregation Control Protocol.
MTU
Maximum Transmission Unit.
CHAP
Challenge Handshake Authentication Protocol. An optional security
mechanism to control access to an iSCSI storage system over the iSCSI
data ports.
iSNS
Internet Storage Name Service.

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1.4 RAID Concepts
RAID Fundamentals
The basic idea of RAID (Redundant Array of Independent Disks) is to combine multiple inexpensive
disk drives into an array of disk drives to obtain performance, capacity and reliability that exceeds
that of a single large drive. The array of drives appears to the host computer as a single logical
drive.
Five types of array architectures, RAID 1 through RAID 5, were originally defined; each provides
disk fault-tolerance with different compromises in features and performance. In addition to these
five redundant array architectures, it has become popular to refer to a non-redundant array of disk
drives as a RAID 0 arrays.
Disk Striping
Fundamental to RAID technology is striping. This is a method of combining multiple drives into one
logical storage unit. Striping partitions the storage space of each drive into stripes, which can be as
small as one sector (512 bytes) or as large as several megabytes. These stripes are then
interleaved in a rotating sequence, so that the combined space is composed alternately of stripes
from each drive. The specific type of operating environment determines whether large or small
stripes should be used.
Most operating systems today support concurrent disk I/O operations across multiple drives.
However, in order to maximize throughput for the disk subsystem, the I/O load must be balanced
across all the drives so that each drive can be kept busy as much as possible. In a multiple drive
system without striping, the disk I/O load is never perfectly balanced. Some drives will contain
data files that are frequently accessed and some drives will rarely be accessed.
By striping the drives in the array with stripes large enough so that each record falls entirely within
one stripe, most records can be evenly distributed across all drives. This keeps all drives in the
array busy during heavy load situations. This situation allows all drives to work concurrently on
different I/O operations, and thus maximize the number of simultaneous I/O operations that can
be performed by the array.

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Definition of RAID Levels
RAID 0 is typically defined as a group of striped disk drives without parity or data redundancy.
RAID 0 arrays can be configured with large stripes for multi-user environments or small stripes for
single-user systems that access long sequential records. RAID 0 arrays deliver the best data
storage efficiency and performance of any array type. The disadvantage is that if one drive in a
RAID 0 array fails, the entire array fails.
RAID 1, also known as disk mirroring, is simply a pair of disk drives that store duplicate data but
appear to the computer as a single drive. Although striping is not used within a single mirrored
drive pair, multiple RAID 1 arrays can be striped together to create a single large array consisting
of pairs of mirrored drives. All writes must go to both drives of a mirrored pair so that the
information on the drives is kept identical. However, each individual drive can perform
simultaneous, independent read operations. Mirroring thus doubles the read performance of a
single non-mirrored drive and while the write performance is unchanged. RAID 1 delivers the best
performance of any redundant array type. In addition, there is less performance degradation
during drive failure than in RAID 5 arrays.
RAID 3 sector-stripes data across groups of drives, but one drive in the group is dedicated to
storing parity information. RAID 3 relies on the embedded ECC in each sector for error detection.
In the case of drive failure, data recovery is accomplished by calculating the exclusive OR (XOR) of

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the information recorded on the remaining drives. Records typically span all drives, which
optimizes the disk transfer rate. Because each I/O request accesses every drive in the array, RAID
3 arrays can satisfy only one I/O request at a time. RAID 3 delivers the best performance for
single-user, single-tasking environments with long records. Synchronized-spindle drives are
required for RAID 3 arrays in order to avoid performance degradation with short records. RAID 5
arrays with small stripes can yield similar performance to RAID 3 arrays.
Under RAID 5 parity information is distributed across all the drives. Since there is no dedicated
parity drive, all drives contain data and read operations can be overlapped on every drive in the
array. Write operations will typically access one data drive and one parity drive. However, because
different records store their parity on different drives, write operations can usually be overlapped.
Dual-level RAID achieves a balance between the increased data availability inherent in RAID 1
and RAID 5 and the increased read performance inherent in disk striping (RAID 0). These arrays
are sometimes referred to as RAID 0+1 or RAID 10 and RAID 0+5 or RAID 50.

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RAID 6 is similar to RAID 5 in that data protection is achieved by writing parity information to the
physical drives in the array. With RAID 6, however, two sets of parity data are used. These two
sets are different, and each set occupies a capacity equivalent to that of one of the constituent
drives. The main advantage of RAID 6 is High data availability – any two drives can fail without
loss of critical data.
In summary:
RAID 0 is the fastest and most efficient array type but offers no fault-tolerance. RAID 0
requires a minimum of two drives.
RAID 1 is the best choice for performance-critical, fault-tolerant environments. RAID 1 is the
only choice for fault-tolerance if no more than two drives are used.
RAID 3 can be used to speed up data transfer and provide fault-tolerance in single-user
environments that access long sequential records. However, RAID 3 does not allow
overlapping of multiple I/O operations and requires synchronized-spindle drives to avoid
performance degradation with short records. RAID 5 with a small stripe size offers similar
performance.
RAID 5 combines efficient, fault-tolerant data storage with good performance characteristics.
However, write performance and performance during drive failure is slower than with RAID 1.
Rebuild operations also require more time than with RAID 1 because parity information is also
reconstructed. At least three drives are required for RAID 5 arrays.
RAID 6 is essentially an extension of RAID level 5 which allows for additional fault tolerance by
using a second independent distributed parity scheme (two-dimensional parity). Data is striped
on a block level across a set of drives, just like in RAID 5, and a second set of parity is
calculated and written across all the drives; RAID 6 provides for an extremely high data fault
tolerance and can sustain multiple simultaneous drive failures. It is a perfect solution for
mission critical applications.

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RAID Management
The subsystem can implement several different levels of RAID technology. RAID levels supported
by the subsystem are shown below.
RAID Level
Description
Min. Drives
0
Block striping is provide, which yields higher
performance than with individual drives. There is no
redundancy.
1
1
Drives are paired and mirrored. All data is 100%
duplicated on an equivalent drive. Fully redundant.
2
N-way mirror
Extension to RAID 1 level. It has N copies of the disk.
2
3
Data is striped across several physical drives. Parity
protection is used for data redundancy.
3
5
Data is striped across several physical drives. Parity
protection is used for data redundancy.
3
6
Data is striped across several physical drives. Parity
protection is used for data redundancy. Requires N+2
drives to implement because of two-dimensional parity
scheme
4
0 + 1
Mirroring of the two RAID 0 disk arrays. This level
provides striping and redundancy through mirroring.
4
10
Striping over the two RAID 1 disk arrays. This level
provides mirroring and redundancy through striping.
4
30
Combination of RAID levels 0 and 3. This level is best
implemented on two RAID 3 disk arrays with data
striped across both disk arrays.
6
50
RAID 50 provides the features of both RAID 0 and RAID
5. RAID 50 includes both parity and disk striping across
multiple drives. RAID 50 is best implemented on two
RAID 5 disk arrays with data striped across both disk
arrays.
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60
RAID 60 provides the features of both RAID 0 and RAID
6. RAID 60 includes both parity and disk striping across
multiple drives. RAID 60 is best implemented on two
RAID 6 disk arrays with data striped across both disk
arrays.
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JBOD
The abbreviation of “Just a Bunch Of Disks”. JBOD
needs at least one hard drive.
1

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Chapter 2 Getting Started
2.1 Packaging, Shipment and Delivery
Before removing the subsystem from the shipping carton, you should visually inspect the
physical condition of the shipping carton.
Unpack the subsystem and verify that the contents of the shipping carton are all there and
in good condition.
Exterior damage to the shipping carton may indicate that the contents of the carton are
damaged.
If any damage is found, do not remove the components; contact the dealer where you
purchased the subsystem for further instructions.
2.2 Unpacking the Subsystem
The package contains the following items:
• iSCSI RAID subsystem unit
• Two power cords
• Three Ethernet LAN cables
• One external null modem cable
• Installation Reference Guide
• Spare screws, etc.
If any of these items are missing or damaged, please contact your dealer or sales representative
for assistance.

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2.3 Identifying Parts of the XL-RAID-2804ISSA Subsystem
The illustrations below identify the various parts of the subsystem.
2.3.1 Front View
2.3.2 Rear View

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1. Power Supply Alarm Reset button
You can push the power supply reset button to stop the power supply buzzer alarm.
2. Uninterrupted Power Supply (UPS) Port (APC Smart UPS only)
The subsystem may come with an optional UPS port allowing you to connect a APC Smart UPS
device. Connect the cable from the UPS device to the UPS port located at the rear of the
subsystem. This will automatically allow the subsystem to use the functions and features of the
UPS.
3. R-Link Port: Remote Link through RJ-45 Ethernet for remote management
The subsystem is equipped with one 10/100 Ethernet RJ45 LAN port. You use web-based browser
to management RAID subsystem through Ethernet for remote configuration and monitoring.
4. Monitor Port
The subsystem is equipped with a serial monitor port allowing you to connect a PC or terminal.
5. Fan Fail indicator
If a fan fails, this LED will turn red.
6. Cooling Fan module
Two blower fans are located at the rear of the subsystem. They provide sufficient airflow and heat
dispersion inside the chassis. In case a fan fails to function, the “ ” Fan fail LED will turn red
and an alarm will sound.
7. Power Supply Power On Indicator
Green LED indicates power is on.
8. System Power On Indicator
Green LED indicates power is on.
9. Power Supply Unit 1 ~ 2
Two power supplies (power supply 1 and power supply 2) are located at the rear of the subsystem.
Turn on the power of these power supplies to power-on the subsystem. The “power” LED at the
front panel will turn green.
If a power supply fails to function or a power supply was not turned on, the “ ” Power fail LED
will turn red and an alarm will sound.

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2.3.3 Environmental Status LEDs
Parts
Function
Power LED
Green LED indicates power is ON.
Power Fail LED
If a redundant power supply unit fails, this LED
will turn to RED and alarm will sound.
Fan Fail LED
When a fan fails, this LED will turn red and an
alarm will sound.
Over Temperature LED
If temperature irregularities in the system
occurs (HDD slot temperature over 45°C), this
LED will turn RED and alarm will sound.
Voltage Warning LED
An alarm will sound warning of a voltage
abnormality and this LED will turn red.
Access LED
This LED will blink blue when the RAID
controller is busy / active.

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2.3.4 Smart Function Panel
PARTS
FUNCTION
Up and Down
Arrow buttons
Use the Up or Down arrow keys to go through
the information on the LCD screen. This is also
used to move between each menu when you
configure the subsystem.
Select button
This is used to enter the option you have
selected.
Exit button EXIT
Press this button to return to the previous
menu.
2.4 Connecting iSCSI Subsystem to Your Network
To connect the iSCSI unit to the network, insert the cable that came with the unit into the network
connection (LAN1) on the back of iSCSI unit. Insert the other end into a Gigabit BASE-T Ethernet
connection on your network hub or switch. You may connect the other network port LAN2 if
needed.
For remote management of iSCSI unit, connect the R-Link port to your network.