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Server Administrator Storage Management 8.2 User’s Guide

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Disk Cache Policy

Does my controller support this feature? See Supported Features.

Set the physical disk caching policy of all members of a virtual disk by enabling the Disk Cache Policy. When this feature is enabled, the physical disk writes data to the physical disk cache before writing it to the physical disk. Because it is faster to write data to the cache than to a disk, enabling this feature improves system performance.

The cache policies are:
  • Enabled — Disk Cache Policy is enabled.
  • Disabled — Disk Cache Policy is disabled.
  • Unchanged — The disk uses the default write cache mode.
    • NOTE: The Unchanged option is applicable only for PERC 9 or later family of hardware controllers.
  • NOTE: The default setting for Disk Cache Policy for virtual disks based on SATA drives is Enabled; and for virtual disks based on SAS drives is Disabled.
  • NOTE: For SAS 6i/R and PERC H200 family of controllers, the Disk Cache Policy setting is available only after creating the virtual disk.

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