User`s guide
Parameters
Controller#
The controller number.
LogicalDrive#
The number of the logical drive. You can specify one or more logical drives.
Channel#
The channel number for the SSD.
Device#
The device number for the SSD.
Read#/Write#
The read/write ratio for invalidating data on the SSD. When the ratio is reached, the page is removed
from the cache. Values range from 1-10 for each parameter.
FlushAndFetchRate#
The read cache fetch rate from 1 to 1000: 1-50=Low, 51-100=Medium, 101-1000=High. The default is
100.
Note: The lower the rate the longer the page is kept on the SSD before it is ushed
from the cache.
dirtyPageThreshold#
Controls the amount cache space allocated to “dirty” data; that is, data that has not been committed
to disk. The threshold value ranges from 1-100 (percent). Once the percentage of dirty pages crosses
the threshold, the data are ushed to disk.
WBCVALID ENABLE|DISABLE
Enables and disables write caching in non-redundant maxCache. Applies to all logical drives.
Policy
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-y 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-y.
Clear
Clears the maxCache pool.
36Proprietary and Condential to PMC-Sierra, Inc.
Document No.: CDP-00276-01-A Rev. A, Issue:
Adaptec RAID Controller Command Line Utility User's Guide