Reference Guide

Different controllers support different disk cache policies. The following table indicates how to specify the
[diskcachepolicy=<disabled | enabled>] parameter for each of the cache policies.
Table 97. Disk Cache Policy Parameters
Disk Cache Policy diskcachepolicy=disabled | enabled Parameter
Specification
Disabled diskcachepolicy=disabled
Enabled diskcachepolicy=enabled
readpolicy=ra | nra | ara | rc | nrc>
Different controllers support different read policies. The following table displays how to specify the readpolicy=<ra | nra
| ara | rc | nrc> parameter for each of the read policies.
Table 98. Read Policy Parameters
Read Policy readpolicy=ra | ara | nra | rc | nrc Parameter Specification
Read ahead readpolicy=ra
Adaptive read ahead readpolicy=ara
No read ahead readpolicy=nra
Read cache readpolicy=rc
No read cache readpolicy=nrc
writepolicy=<wb | wt | wc | nwc>]
Different controllers support different write policies. The following table displays how to specify the writepolicy=<wb |
wt | wc | nwc | fwb> parameter for each of the write policies.
Table 99. Write Policy Parameters
Write Policy writepolicy=wb | wt | wc | fwb | nwc Parameter
Specification
Write-back cache writepolicy=wb
Write-through cache writepolicy=wt
Write cache writepolicy=wc
Force write back writepolicy=fwb
No write cache writepolicy=nwc
Controller=id
Specify the controller ID as reported by the omreport storage controller command. For example,
controller=2
Raid=<c | r0 | r1 | r1c | r5 | r6 | r10 | r50 | r60>
Use the raid=<c| r0 | r1| r1c | r5 | r6 | r10 | r50 | r60> parameter to specify concatenation or a RAID level for a virtual disk.
Different controllers support different RAID levels. For more information about RAID levels a controller supports and for
general information about RAID levels and concatenation, see the Dell OpenManage Online Help . The following table
displays how to specify the raid=n parameter for each RAID level and concatenation.
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