Dell PowerVault MD3200 Series, Cli Manual

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126
Script Commands
Additional Information
Cache Read Prefetch
The
cacheReadPrefetch
command lets the RAID controller module
copy additional data blocks into cache while the RAID controller module
reads and copies data blocks that are requested by the host from the physical
disks into cache. This action increases the chance that a future request for
data can be fulfilled from cache. Cache read prefetch is important for
multimedia applications that use sequential data transfers. The configuration
settings for the storage array that you use determine the number of additional
data blocks that the RAID controller module reads into cache. Valid values for
the
cacheReadPrefetch
parameter are
TRUE
or
FALSE
.
You do not need to enter a value for the cacheReadPrefetch parameter or the
segmentSize parameter. If you do not enter a value, the RAID controller
module firmware uses the usageHint parameter with fileSystem as the default
value. Entering a value for the usageHint parameter and a value for the
cacheReadPrefetch parameter or a value for the segmentSize parameter does
not cause an error. The value that you enter for the cacheReadPrefetch
parameter or the segmentSize parameter takes priority over the value for the
usageHint parameter.
enclosureLossProtect
The setting to enforce enclosure loss protection
when you create the disk group. To enforce
enclosure loss protection, set this parameter to
TRUE . The default value is FALSE .
securityType
The setting to specify the security level when
creating the disk groups and all associated virtual
disks.
• none —The disk group and virtual disks are not
secure.
• capable —The disk group and virtual disks are
capable of having security set, but security has not
been enabled.
• enabled —The disk group and virtual disks have
security enabled.
Parameter Description
book.book Page 126 Friday, March 4, 2011 10:45 AM