6.7 RAID Interleave Parameters

The interleave size sets the amount of data to be written to each drive in a RAID Level group. This is a tunable parameter which takes a single stream of data and breaks it up to use multiple disks per I/O interval.

CAUTION

Changing this parameter causes all previous drive data on the Diamond Storage Array to be erased. Make sure you back up all information before setting up different interleave sizes.

The default sector interleave set by the QuickRAID command is 128 blocks (64k). The CLI command, RAIDInterleave, allows you to change the size of the sector interleave between RAID groups. The value depends upon the normal expected file transfer size. If the normal file transfer size is large, the interleave value should be large, and vice versa.

The value entered for the RAIDInterleave command refers to blocks of data: one block is equivalent to 512 bytes of data.

To change the RAID Interleave parameter

1Connect 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 Command Line Interface.

2Continue with the CLI or 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.

RAIDInterleave options are 16, 32, 64, 128, 256 blocks and span. Span is not available for RAID Level 5.

3 In all RAID levels except RAID Level 5, type

set RAIDInterleave [163264128256 span]

For RAID Level 5 type

set RAIDInterleave [163264128256]

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.

8The array is now configured. To verify the configuration, type get RAIDInterleave.

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ATTO Technology S-Class manual RAID Interleave Parameters, To change the RAID Interleave parameter

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