ATTO Technology VT-Class manual Rebuilding RAID Level 5 and 10 Configurations

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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 Note

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

1Display the status of the array by typing RAIDRebuildStatus.

2Set 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.

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.

1Connect to Diamond Storage Array services via the RS-232 port or the optional Ethernet management services card (see Accessing the Diamond-VTon page 15). You should now be in the CLI.

2Continue with the CLI or access the RAID page of the ExpressNAV interface (see ATTO ExpressNAV:

on page 23).

3Type AutoRebuild enabled.

4Information displays on the screen while the array updates NVRAM ending with a Ready*.

5Type SaveConfiguration.

6Type FirmwareRestart to reboot the array.

7Reboot the host computer connected via Fibre Channel or SCSI to the array.

8To verify the configuration, type

RAIDRebuildStatus

9If 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.

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ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual