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preReadConsistencyCheck=(TRUE | FALSE)
readCacheEnabled=(TRUE | FALSE)
writeCacheEnabled=(TRUE | FALSE)
cacheReadPrefetch=(TRUE | FALSE)
Syntax Applicable To Only One Virtual Disk
set (virtualDisk ["virtualDiskName"] | virtualDisk <wwID>)
addCapacity=virtualDiskCapacity
[addPhysicalDisks=(enclosureID1,drawerID1,slotID1 ...
enclosureIDn,drawerIDn,slotIDn)]
consistencyCheckEnabled=(TRUE | FALSE) segmentSize=segmentSizeValue
userLabel=virtualDiskName
preReadConsistencyCheck=(TRUE | FALSE)
preReadConsistencyCheck
The setting to turn on or turn off preread consistency checking. Turning on preread consistency
checking verifies the consistency of RAID redundancy data for the stripes containing the read data.
Preread consistency checking is performed on read operations only. To turn on preread consistency
checking, set this parameter to TRUE. To turn off preread consistency checking, set this parameter to
FALSE.
NOTE: Do not use this parameter on non-redundant virtual disks, such as RAID 0 virtual disks.
Guidelines while using the Pre-Read Consistency Check option:
• Changing the Pre-Read Consistency Check setting modifies the setting only for the overall repository
that you selected.
• The Pre-Read Consistency Check setting is applied to all individual repository virtual disks contained
within the overall repository.
• If an overall repository virtual disk that is configured with pre-read is migrated to a RAID level that
does not maintain consistency information, the metadata of the overall repository virtual disk
continues to show that pre-read is enabled. However, reads to that overall repository virtual disk
ignores consistency pre-read. If the virtual disk is subsequently migrated back to a RAID level that
supports consistency, the option becomes available again.
NOTE: Enabling the option on overall repository virtual disks without consistency does not affect
the virtual disk. However, the attribute is retained for that overall repository virtual disk if it is ever
changed to one with consistency information.
Setting Snapshot Virtual Disk Repository Virtual Disk Capacity
To increase or decreases the capacity of a snapshot virtual disk repository virtual disk, use the set
snapVirtualDisk command.
A snapshot repository virtual disk is an expandable virtual disk that is structured as a concatenated
collection of up to 16 standard virtual disk entities. Initially, an expandable repository virtual disk has only
a single element. The capacity of the expandable repository virtual disk is exactly that of the single
element. You can increase the capacity of an expandable repository virtual disk by attaching additional
standard virtual disks to it. The composite expandable repository virtual disk capacity then becomes the
sum of the capacities of all of the concatenated standard virtual disks.
A snapshot group repository virtual disk must satisfy a minimum capacity requirement that is the sum of
the following:
• 32 MB to support fixed overhead for the snapshot group and for copy-on-write processing.
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