H206651: Incorrect recovery guru message received for Write Back (WB) caching - IBM System Storage
RETAIN tip: H206651
Even though all Logical Unit Numbers (LUNs) are configured with Write Back (WB) cache disabled, the IBM DS Storage Subsystem still receives the following Recovery Guru message:
This Recovery Guru message did not clear until one of the LUNs was set using the Storage Manager Client Graphical User Interface (GUI) to WB cache enabled and then disabled again.
The system may be any of the following IBM servers:
This tip is not software specific.
This tip is not option specific.
The 7.77 and 7.83 firmware for the DS3500, DCS3700, DS5020, DS3950, DS5100, and DS5300 is affected.
This behavior will be corrected in a future release of the 7.8x firmware.
The target date for this release is scheduled for second quarter 2013.
The file is or will be available by selecting the appropriate Product Group, type of System, Product name, Product machine type, and Operating system on IBM Support's Fix Central web page, at the following URL:
To clear the Recovery Guru message, set one of the Logical Unit Numbers (LUNs) using the Storage Manager Client Graphical User Interface (GUI) to Write Back (WB) cache enabled and then disabled again.
This issue is due to incorrect processing in the controller firmware related to the WB cache Recovery Guru message.
Applicable countries and regions
Document id: MIGR-5091727