ESXi 5.1 performance poor, MS iSCSI initiator fast

[Tijz]

Ok, update.

I found time and resources to relocate the server to our office.

Now I added an IDE disk and put an img file on that and exported it using Starwind. You can guess, When writing to this target/device I get 700Mbps. constant.

When writing to an image located on my RAID5 set I get barely 100Mbps, also, the performance seems erratic (going continuously from 0 to 200Mbps in a few seconds), where it is a flat line at 700Mbps when writing to the target on the IDE disk. that's weird right?

So problem seems to be the RAID(controller). But using IOMeter locally on the volume doesn't show any problems.

The controller is an LSI SAS controller without a battery, but with cache (allthough the cache is disabled).

End again, when copying a large file to the same volume using a windows share, network utilization of the 1Gbps ethernet adapter is 80-90% (when using iSCSI it's about 14%)

[anton (staff)]

Interesting. Did you try to play with StarWind cache sizes?

[Max (staff)]

As far as I remember no battery means no write caching. And since it is a RAID5 - I'm not really surprised with the numbers.

[anton (staff)]

For reads they should do better.

As far as I remember no battery means no write caching. And since it is a RAID5 - I'm not really surprised with the numbers.