Page 1 of 1
Performance
Posted: Tue Oct 30, 2007 12:10 pm
by synthicate
Hi,
I've recently installed the StarWind Pro on a server running Windows 2003 R2 (Enterprise). When I tried to connect the clients (running Win XP) thru Windows iSCSI and StarPort, I couldn't get more than 5MB/s read/write to the harddrives. The network is entirely gbit, and I get 50-65 MB/s when mounting a RAMDisk. I've tried mounting the harddrives as SPTI and Direct Bridge, but it seems as the performance is "stuck" at 5MB/s (constantly 5MB/s and a perfectly flat line when measuring the bandwidth). Any suggestions?
Best regards
André
Posted: Tue Oct 30, 2007 12:18 pm
by anton (staff)
This is unacceptable. You should get 10-15% less then local hard disk does on the target.
What about image file with the buffering set to "OFF"?
What tool do you use to measure the performance?
Posted: Tue Oct 30, 2007 12:43 pm
by synthicate
When buffering set to ON the transfer became very erratic (left graph). When turning OFF the buffering I got pretty good results (right graph). The tool used is Bandwidth Monitor Pro.
Left: Buffering=ON, Right: Buffering=OFF
Posted: Tue Oct 30, 2007 12:53 pm
by anton (staff)
So image file with the buffering set to OFF is OK for you? Can you provide the same graph for the SPTI and DiskBridge share mode. Thanks!
Posted: Tue Oct 30, 2007 1:10 pm
by synthicate
Thanks for your reply, Anton! I'm fine with no buffering on image files, as long as the transmission is steady and fast. Here are the two more graphs:
Left: SPTI, Right: DiskBridge
The file being transferred in all cases is a 5GB-file
Posted: Tue Oct 30, 2007 1:14 pm
by anton (staff)
Both SPTI and DiskBridge should not work that slow. I'll bring Valery to look at this issue later today.
I'd suggest you to check the same configuration with the I/O meter.
Posted: Tue Oct 30, 2007 1:23 pm
by synthicate
Think I've narrowed it down to the RAID-controller. Tried to create an image-file on one of the RAID-partitions, and the transfer-rate never reached more than 5MB/s (strange thing though, having 45MB/s on other partitions).
There might be some issues when transferring large files, so I'll examine the hardware closer. Don't think the problem lies within the StarWind, as I first thought, but will keep you updated in case someone else has the same problem
Thank you for your support!
Posted: Tue Oct 30, 2007 1:39 pm
by anton (staff)
We're acting as a bridge software. So we can add a little bit of the latency, make things run smoother but not with so dramatical drops
Good idea is to tune local disk I/O subsystem and network stack and do SAN only after makings sure they both work fine.