ATTO Technology Diamond Storage Array S-Class - Manual (Page 78)

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ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
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 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
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
Command Line Interface.
2 Continue 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 [16|32|64|128|256| span]
For RAID Level 5 type
set RAIDInterleave [16|32|64|128|256]
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 The array is now configured. To verify the
configuration, type
get RAIDInterleave.