Hi all,
I am a little lost with the following issue:
Currently we have a Equallogic SAN array that is feeding iSCSI to our file server cluster (Windows 2008 R2 Ent). The iSCSI speed is initially fine, using the maximum throughput on read and write. After a few days or so, the performance drops on the read speed only, to about 30% of the maximum.
So far I have checked the following:
Array utilisation - This issue occurs regardless of load on the array
Network traffic - Connections are all unsaturated, and have capacity
Disk alignment
The only thing I can see that is related is the disk latency increases by 5-6x when the drop in performance occurs. I also have found that once the issue starts, if I just attach a raw disk, then the performance is fine on that disk until you add a partition to it.
I have a support call open with Equallogic, but so far the array is performing fine, just appears to happen on our file clusters at the moment.
Any ideas?
I am a little lost with the following issue:
Currently we have a Equallogic SAN array that is feeding iSCSI to our file server cluster (Windows 2008 R2 Ent). The iSCSI speed is initially fine, using the maximum throughput on read and write. After a few days or so, the performance drops on the read speed only, to about 30% of the maximum.
So far I have checked the following:
Array utilisation - This issue occurs regardless of load on the array
Network traffic - Connections are all unsaturated, and have capacity
Disk alignment
The only thing I can see that is related is the disk latency increases by 5-6x when the drop in performance occurs. I also have found that once the issue starts, if I just attach a raw disk, then the performance is fine on that disk until you add a partition to it.
I have a support call open with Equallogic, but so far the array is performing fine, just appears to happen on our file clusters at the moment.
Any ideas?