Few weeks back, there is one customer from Taiwan drop me an email with a lot of logs attached. After I read the last line of the content, then only I know he was asking me to analyze the log to ensure whether the storage is working fine or not. Customer confirm the storage was working time at that time, but the management software: Modular Disk Storage Management (MDSM)
Date/Time: 1/28/11 4:01:16 PM
Sequence number: 1051
Event type: 210A
Event category: Internal
Priority: Informational
Description: RAID Controller Module cache not enabled or was internally disabled
Event specific codes: 0/0/0
Component type: RAID Controller Module
Component location: RAID Controller Module in slot 1
Logged by: RAID Controller Module in slot 1
Raw data:
4d 45 4c 48 03 00 00 00 1b 04 00 00 00 00 00 00Cause:
0a 21 48 00 4c 99 19 4d 00 00 00 00 00 00 00 00
00 00 00 00 04 00 00 00 08 00 00 00 08 00 00 00
ff ff ff ff 01 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
01 00 00 00 00 00 01 00 00 00 00 00
May occur when moving Virtual Disk (VD) between two controllers, in the situation of fail-over or when changing the preferred owner of the VD.
This is informational message/log which will shown in Major Event Log (MEL) only, and is often only temporary. When there is any VD changes, write cache is only temporarily disabled, and it cause this event is logged. For older firmware version (before 7-Oct-2009 release), it wouldn't have a log when the write cache is automatically be re-enable once the VD changes have been completed. Hence, consider to update the MD3000/MD3000i to latest firmware to avoid such 'annoying' message logged. :-)
To ensure the write cache has been enabled, you may refers to "StorageArrayProfile" under support bundle, use Ctrl-F, and type "write cache" to search for the status. Below is one of the example of StorageArrayProfile from one of my customer:
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