ATTO Technology Diamond Storage Array VT-Class - Manual (Page 76)

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ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
9.3 Rebuilding RAID Level 5 and 10 Configurations
If a sled must be removed and a new sled inserted into the Diamond Storage Array while it is configured in a RAID
Level 5 or 10, you must rebuild the RAID Level using CLI commands or the ExpressNAV interface.
WARNING
Selecting RAID parameters causes all
previous drive data on the Diamond
Storage Array to be erased. Make sure all of
your information is backed up before
setting up RAID groups.
When you initially set up RAID groups using the
QuickRAID command, groups are synchronized
automatically because there is no pre-existing data on
the drives. However, drives may display as “degraded,
and you need to set all LUNs to OK status.
The simplest method to check RAID group status is to
access the RAID page of the ExpressNAV interface.
See ATTO ExpressNAV: Browser-based Interface on
page 23 .
Note
Because the ExpressNAV pages take you
through this process easily, the following
instructions are based on the CLI commands.
Use these instructions as a guide in ExpressNAV.
To reset LUN status
1 Display the status of the array by typing
RAIDRebuildStatus .
2 Set the sleds which are listed as degraded to a
rebuild state of OK by entering
set RAIDRebuildState [sled number] OK
Virtual Tape synchronization
The most efficient method to synchronize Virtual
Tape configurations is to enable Hot Spares or the
Auto Rebuild feature.
To synchronize mirrored drives automatically
If mirrored drives are removed for more than 15 to 30
seconds and then re-inserted or replaced, the replaced
drives are labeled “degraded” when you check the
Array’s status by typing
RAIDRebuildStatus . If you
enable AutoRebuild. the array rebuilds the degraded
drives automatically when a new drive is inserted.
Note
Drive rebuilding reduces performance. You may
want to leave
AutoRebuild at the default
disabled and manually rebuild during off-peak
hours, or use the RebuildPriority command
described below.
1 Connect to Diamond Storage Array services via
the RS-232 port or the optional Ethernet
management services card (see
Accessing the
Diamond-VT on page 15). You should now be in
the CLI.
2 Continue with the CLI or access the RAID page of
the ExpressNAV interface (see
ATTO ExpressNAV:
Browser-based Interface on page 23).
3 Type AutoRebuild enabled .
4 Information displays on the screen while the array
updates NVRAM ending with a
Ready* .
5 Type SaveConfiguration.
6 Type FirmwareRestart to reboot the array.
7 Reboot the host computer connected via Fibre
Channel or SCSI to the array.
8 To verify the configuration, type
RAIDRebuildStatus
9 If a rebuild is necessary, the array will
automatically rebuild drives.
Rebuild priority
Drive rebuilding reduces performance. Use the
RebuildPriority command through the CLI or on the
RAID page of the ExpressNAV interface to customize
when your rebuilds will occur.Choices are High, Low
and Same .
• If you select High priority, rebuild I/O requests
are implemented before system I/O requests.
• If you select Low priority, rebuild I/O requests
execute only when there are no pending I/O
requests.
• If you select Same priority, rebuild I/O and
system I/O receive equal consideration.
You must use a SaveConfiguration Restart
command to implement the rebuild priority command.