Hello,

I have a ps4000, connected over iscsi to a windows 2008 r2 (hyper-v virtual) server,

I have some inconsistent performance issues with the read speeds in particular with small file sizes.

Copying large files to the san is fine, and copying small files to the san is also fine. However when trying to copy small files from either one iscsi drive to the another or from iscsi to local drives the performance drops dramatically.

It's much more noticable with smaller files, with the speeds dropping to as low as 10-15mb/s.

any ideas of where to start? I had looked at the disk cache settings, this is set to write-back which as far as i have read seems the better option for performance. The disk cache options are not available within windows, i assume as there are the settings on the san.

The same issue occurs when connecting the iscsi target to the host server (so it doesn't seem to be config issues with the virtual server).

There is a rise in cpu/nic activity when performing the copies but not to any noticable end.

If anyone has any thoughts they'd be much appreciated.

thanks