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ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
5.6 Rebuilding RAID Level 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 1, 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.
Refer to
ATTO ExpressNAV: Browser-based
Interface
on page 25
.
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
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 (refer to
Accessing
the Array
on page 17). You should now be in
CLI.
2 Continue with the CLI or access the
RAID page
of the ExpressNAV interface (refer to
ATTO
ExpressNAV: Browser-based Interface
on page 25).
3Type
AutoRebuild enabled.
4 Information displays on the screen while the
array updates NVRAM ending with a
Ready
*.
5Type SaveConfiguration.
6Type
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.