Dell PowerVault MD3420 - Manual (Page 177)

Parameter Description
cacheReadPrefetch The setting to turn on or turn off cache read
prefetch. To turn on cache read prefetch, set this
parameter to TRUE. To turn off cache read
prefetch, set this parameter to FALSE.
segmentSize Amount of data (in kilobytes) that the RAID
controller module writes on a single physical disk
in a virtual disk before writing data on the next
physical disk. Valid values are 8, 16, 32, 64, 128,
256, or 512. For information about the
segmentSize parameter, see Using The Auto
Configure Command.
usageHint The settings for both the cacheReadPrefetch
parameter and the segmentSize parameter
should be the default values. The default values are
based on the typical I/O usage pattern of the
application that is using the virtual disk. Valid values
are fileSystem, dataBase, or multiMedia.
dssPreAllocate The setting to make sure that reserve capacity is
allocated for future segment size increases. The
default value is TRUE.
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.
For information about securityType, see
Security Type.
Create RAID Virtual Disk (Manual Physical Disk Select)
Description
This command creates a new disk group and virtual disk, and enables you to specify the physical disks for
the virtual disk.
NOTE: You cannot use mixed physical disk types in the same disk group and virtual disk. This
command fails if you specify different types of physical disks for the RAID virtual disk.
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