I have IBM SAN STORAGE DS4100 and one of the cache battery for the controller is dead. Suddenly the performance has been degraded and access to SAN disks ( reading and writing ) became very slow ?
My query: Replacing the battery will take 6 days, so in the mean time what are the ways to speed up the access to the disks ?
1) Could I move the Array from the failed battery controller B to controller A ? Does it need to have multipath MPIO installed and configured ?
2) disable the write cache and enable write-cache working without battery ==> Will it improve the performance ?
3) powering off SAN Storage completely and restarting it ? ==> will there be any implications ?
http://www.tek-tips.com/viewthread.cfm?qid=1493007&page=41
From the storage manager you have to findout the arrays which are pointing to that suspected controller ( say Controller-B) against which the battery is failed.
Now you have to move the arrays from controller-B to Controller-A and make sure while doing this there is no I/O with the disks in the stroage.
It takes little bit of time to move the arrays from the contr-B to contr-A. After this, you have to disable the controller through storage manager. After doing this you can take that module out from DS4300 and replace the battery.
After change the battery, you please put it back into storage DS4300 unit and enable the controller.
After enable the controller, you have to move all the arrays back which you previoulsy moved from Contr.-B to Contr.-A
The Storage Manager Help is pretty staright forward in which you can see the step by step process to change the battery.
---------- Post updated at 01:43 PM ---------- Previous update was at 11:47 AM ----------
I think Multipath is not enabled on the system even though HACMP is installed
# lsdev -Cc disk
hdisk0 Available 1S-08-00-8,0 16 Bit LVD SCSI Disk Drive
hdisk1 Available 1S-08-00-9,0 16 Bit LVD SCSI Disk Drive
hdisk2 Available 1V-08-02 1722-600 (600) Disk Array Device
hdisk3 Available 1D-08-02 1722-600 (600) Disk Array Device
hdisk4 Available 1V-08-02 1722-600 (600) Disk Array Device
hdisk5 Available 1D-08-02 1722-600 (600) Disk Array Device
# lspv
hdisk1 0059da1d0ddcf5b9 rootvg active
hdisk2 0059da1d0d864640 oraappvg active
hdisk3 0059c87d0d80db98 oradbvg
hdisk4 0059c87d7662aa73 None
hdisk0 0059da1d968b4e5f rootvg active
hdisk5 0059c87d27ac212f oradbvg
# lspath
Enabled hdisk0 scsi0
Enabled hdisk1 scsi0
Last edited by filosophizer; 05-01-2011 at 05:20 PM..
The problem was solved by disabling the read and write cache for the disks under the controller which had the failed battery.
I think it could have been solved also by moving the disks from Controller B to controller A , but this I am not sure if you don't have MPIO ( Multi path I/O ) how will it behave ?
Hi,
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