MD1000 automatic change from write back to write through???

mcclnx mcc mcclnx at yahoo.com.tw
Thu Aug 12 18:15:40 CDT 2010


we have DELL R900 with two MD1000 connect to it.  The O.S. is Redhat 5.5 X86_64.  DELL OPMN version 6.1.

recently I saw /var/log/messages have messages:

Aug 12 03:05:14 ORA03 Server Administrator: Storage Service EventID: 2278  The controller battery charge level is below a normal threshold.:  Battery 0 Controller 0
Aug 12 03:05:14 ORA03 Server Administrator: Storage Service EventID: 2188  The controller write policy has been changed to Write Through.:  Battery 0 Controller 0
Aug 12 03:05:14 ORA03 Server Administrator: Storage Service EventID: 2199  The virtual disk cache policy has changed.:  Virtual Disk 0 (Virtual Disk 0) Controller 0 (PERC 6/E Adapter)
Aug 12 03:05:15 ORA03 Server Administrator: Storage Service EventID: 2199  The virtual disk cache policy has changed.:  Virtual Disk 1 (Virtual Disk 1) Controller 0 (PERC 6/E Adapter)

I used OPMN to check and found disk cache policy change to "write" through".  I tried to use OPMN "change policy" to change it bcak to "write back".  I didn't get error but policy did NOT change.

anyone know why and how to change it back?

Thanks.


      




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