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

Jefferson Cowart Jefferson_Cowart at cuc.claremont.edu
Thu Aug 12 18:56:16 CDT 2010


That happens automatically when battery power drops below a threshold.
It should go back to write back once the battery is recharged.

-- 
Thank You
Jefferson Cowart
Network and Systems Administrator
Claremont University Consortium


> -----Original Message-----
> From: linux-poweredge-bounces at dell.com
[mailto:linux-poweredge-bounces at dell.com] On Behalf Of mcclnx
> mcc
> Sent: Thursday, August 12, 2010 16:16
> To: linux-poweredge at dell.com
> Subject: MD1000 automatic change from write back to write through???
> 
> 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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