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