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Logical Drive
Logical Drive indicates the logical drive stripe size with the following options:
• Stripesize <STRIPE>—Allows the logical drive stripe size to be built. Optional parameters for specifying
a stripe size. STRIPE is specified in kilobytes 16, 32, 64, 128, 256, 512 and 1024 are supported. The
default is 256KB.
• Legs <LEG>—Optional parameters for specifying number of legs. Value is an integer.
• LEG—Number of legs for RAID level 50 or 60.
∘ RAID 50—2-16 legs, 3-32 drives/leg, 128 drives max.
∘ RAID 60—2-16 legs, 4-16 drives/leg, 128 drives max.
• Name <NAME>—Optional parameter for specifying the alias name of a logical device that is displayed
in the utilities. Value is a string of up to 16 characters.
• Priority <PRIORITY>—Initialization Priority for logical drive to be created. Valid options are: HIGH,
MED, or LOW.
• Method <METHOD>—Initialization method for the logical drive. Valid options include: BUILD, CLEAR,
QUICK, SKIP. Use SKIP for recovery only (to skip the initialization step).
• Rcache—Sets the logical drive read cache mode:
∘ RON - read cache on
∘ ROFF - read cache off
• Wcache—Sets the logical drive write cache mode:
∘ WT - write-through disabled
∘ WB - write-back enabled
∘ WBB - write-back enabled (when protected by battery or flash backup module)
• MaxCacheReadCache—Sets the logical drive SSD read cache mode:
∘ ION - maxCache on
∘ IOFF - maxCache off
• MaxCacheWriteCache—Sets the logical drive SSD write cache mode:
∘ ION - maxCache on
∘ IOFF - maxCache off
• MaxCacheWritePolicy—Sets the maxCache write cache policy:
∘ WB - write back enabled. maxCache will store the data on the SSD and write it back to the hard
disks when there is little or no impact on performance. This is the default policy.
∘ INSTWB - instant write back enabled. In addition to the default policy, maxCache will create "dirty
pages" on-the-fly for full-stripe writes if there is room on the SSD and the number of dirty pages
is below the threshold.
∘ WT - write through enabled. Similar to instant write back, but full-stripe writes go to both the
cache and hard disk and no dirty pages are created on-the-fly.
This argument is valid only if MaxCacheWriteCache is ION.
Note: For more information about write cache policy, see
arcconf setmaxcache
Size
Indicates the size of the logical drive in megabytes. Use MAX to set size to available space.
RAID#
Indicates the RAID level for the new logical drive: 0, 1, 1E, 10, 5, 5EE, 50, 6, 60, and volume are supported.
For maxCache, 0, 1, 1E, 5 and Simple_Volume are supported.
Channel# Drive#
Lists the space-delimited channel number and device number pairs for each device to add to the logical
drive or maxCache Container. For maxCache, the devices must be SSDs.
Rvolume
RAID level for a RAID volume logical drive.
Proprietary and Confidential to PMC-Sierra, Inc.
Document No.: CDP-00276-01-A Rev. A, Issue:
Adaptec RAID Controller Command Line Utility User's Guide
on page 35.
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