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RAIDWatch User’s Manual
9.2.2.3. Setting RAID Parameters
After the physical drives that will be used in the LD have been selected, the RAID
parameters for the LD must be selected. Available RAID parameter options can be
accessed at the bottom of the configuration screen.
Drive Size
The value entered in the Drive Size field determines how much capacity from each
drive will be used in the logical drive.
NOTE:
Enter a smaller number if you do not want to use up all of the capacity
at this time. The unused capacity can be utilized later using the Expand
Logical Drive function.
Selecting Stripe Size
The stripe size used when the LD is created can be selected from the Stripe Size
pull down menu. The following stripe sizes are available: 16KB, 32KB, 64KB,
128KB, 256KB, 512KB, or 1024KB. A default stripe size is pre-selected.
Select a stripe size, but note that stripe size arrangement has a tremendous effect
on RAID subsystem performance. Changing strip size is only recommended for
experienced users. Stripe size defaulted to this menu is determined by the
subsystem Optimization mode and the RAID level selected.
Initialization Options
This allows you immediate availability of the array. "Online" means the logical
drive is immediately available for I/Os and the initialization process can be
automatically completed some time later.
Select RAID Level
From the RAID Level pull-down menu shown, select the RAID level you wish to
use when creating the LD.
Write Policy
Define the write policy that will be applied to this array. "Default" means identical
to the subsystem’s overall setting. The overall setting can be accessed in the
Caching Parameters section of the Configuration Parameters sub-window.
NOTE:
The Default option should be considered as “Not-Specified.” If set to
Default, the logical drive’s caching behavior will be automatically
controlled by firmware. In the event of component failure or violated
temperature threshold, Write-back caching will be disabled and
changed to a conservative “Write-through” mode.
9-6 Logical Drive Management
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