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Troubleshooting Software iSCSI performance

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Hello,


We are experiencing difficulties with our View infrastructure: users suffers from slow response times.
The central issue seems to be disk performance, basically file copies/transfers can't exceed 20-30 MB/s.

This is a 4 servers (hp dl385) ESX 4.1 cluster, using a NetApp FAS2050 SAS SAN connected via vmware software iscsi through a dedicated 1Gbps network.
I can't understand the results of basic IOmeter tests (based on the famous OpenPermformance.icf), perhaps someone can point me in the right direction...

 

 

 

I used a sequential read test, with 32KB block size; what puzzled me is the per thread results:
- 1 thread  => 25MB/s
- 4 threads => 95MB/s
- 8 threads => 105MB/s
So basically the storage setup can use up all the gigabit link, but not on a single thread...this results in most real life file operations being capped at 25 MB/s...

 

 

 

Anybody ever experienced something like this ?
What test can I run to pinpoint the problem ?

 

 

 

Thanks.

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