Skip to main content
NetApp Response to Russia-Ukraine Cyber Threat
In response to the recent rise in cyber threat due to the Russian-Ukraine crisis, NetApp is actively monitoring the global security intelligence and updating our cybersecurity measures. We follow U.S. Federal Government guidance and remain on high alert. Customers are encouraged to monitor the Cybersecurity and Infrastructure Security (CISA) website for new information as it develops and remain on high alert.
NetApp Knowledge Base

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

Views:
934
Visibility:
Public
Votes:
0
Category:
e-series-santricity-os-controller-software
Specialty:
esg
Last Updated:

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.

Scan to view the article on your device
CUSTOMER EXCLUSIVE CONTENT

Registered NetApp customers get unlimited access to our dynamic Knowledge Base.

New authoritative content is published and updated each day by our team of experts.

Current Customer or Partner?

Sign In for unlimited access

New to NetApp?

Learn more about our award-winning Support