troubleshooting Question
SQL disk performance
I need to look in to an SQl LUN performance issue, the LUN is served by an EMC CX4-240 SAN.
my issue is that SQl performance is poor, the SQl server is robust enough for the workload i.e. CPU utilization is at about 25% Memory 53%.
however on the storage side when I look at MS counters using prefmon.exe most of the counter like queue, Disk transfer per/sec average disk bytes disk write are all at 100% at all times.
I ran an SQl backup to NULL so I could estimate my storage performance and the the process completed with the speed of 49.5 MB/sec.
I ran the same SQL backup to NULL on a lab system on an ESX server and storage on the same ESX at a much faster speed of 120.3 MB/sec.
how can I pinpoint the source of this performance bottleneck, the SAN people are telling me that the SAN is solid and all I can see on the SQl server side points to disk issue.
any help would be appreciated.
my issue is that SQl performance is poor, the SQl server is robust enough for the workload i.e. CPU utilization is at about 25% Memory 53%.
however on the storage side when I look at MS counters using prefmon.exe most of the counter like queue, Disk transfer per/sec average disk bytes disk write are all at 100% at all times.
I ran an SQl backup to NULL so I could estimate my storage performance and the the process completed with the speed of 49.5 MB/sec.
I ran the same SQL backup to NULL on a lab system on an ESX server and storage on the same ESX at a much faster speed of 120.3 MB/sec.
how can I pinpoint the source of this performance bottleneck, the SAN people are telling me that the SAN is solid and all I can see on the SQl server side points to disk issue.
any help would be appreciated.
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