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How to determine if write cache is enabled on E-Series

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Applies to

  • E-Series Controller Firmware 7.xx
  • E-Series Controller Firmware 8.xx

Description

There are a few methods for checking if Cache is enabled; the most simple are as follows:

Method 1: STORAGE-ARRAY-PROFILE

Cache settings are reported on a per-volume basis and can be found in the 'STORAGE-ARRAY-PROFILE' file of an E-Series support collection, under the 'Details' portion of the 'Standard Volumes' section.

Potential States:

Write cache:    Enabled
Write cache:    Disabled
Write cache:    Enabled    (currently suspended) <- Indicates controller suspended cache for some reason. Will need to be investigated.

 

See the attached sample STORAGE-ARRAY-PROFILE.

Method 2: STATE-CAPTURE-DATA

Cache settings can also be found in the 'STATE-CAPTURE-DATA', in the 'ccmShowState' under 'CacheDeviceFlags':

Potential States:

RCE = Read Cache Enabled
RCA = Read Cache Active
RCD = Read Cache Disabled
RCD = Read Cache Inactive
WCE = Write Cache Enabled
WCA = Write Cache Active
WCD = Write Cache Disabled
WCI = Write Cache Inactive
CME = Cache Mirroring Enabled
CMA = Cache Mirroring Active
CMD = Cache Mirroring Disabled
CMI = Cache Mirroring Inactive
WC_INTERNALLY_DISABLED  <- Indicates controller suspended cache for some reason. Will need to be investigated.
CM_INTERNALLY_DISABLED  <- Indicates controller suspended cache for some reason. Will need to be investigated.

See the attached sample STATE-CAPTURE-DATA.

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