Troubleshooting
Problem
A status of write cache suspended for the logical drives can cause write cache poor performance.
Symptom
Slow I/O
Cause
In IBM DS3000 Series whenever there is a status of write cache suspended for the logical drives, it can cause write cache poor performance due to slow I/O
Environment
Smart Analytics System
Diagnosing The Problem
Open the Logical Drives section on the Storage Subsystem Profile to confirm the status on the write cache is "currently suspended"
Read cache: Enabled
Write cache: Enabled (currently suspended)
Write cache without batteries: Disabled
Write cache with mirroring: Enabled (currently suspended)
Resolving The Problem
1. Go to the Data Storage Manager -> Tools -> Execute Script
2. Run the following commands to turn off the write cache completely:
set allLogicalDrives writeCacheEnabled=false;
set allLogicalDrives readCacheEnabled=false;
set alllogicaldrives mirrorcacheenabled=false;
3. Run the following commands to turn the write cache back on:
set allLogicalDrives writeCacheEnabled=true;
set allLogicalDrives readCacheEnabled=true;
set alllogicaldrives mirrorcacheenabled=true;
4. Repeat step #1 to confirm the status on the write cache does not show the "currently suspended" status anymore.
5. If status has not changed reboot the controllers one at the time.
Was this topic helpful?
Document Information
Modified date:
16 June 2018
UID
swg21659978