topic Re: P2000 G3 performance issue in MSA Storage

P2000 G3 performance issue

OsiTr — Sun, 30 Oct 2011 19:35:07 GMT

Hi All

We have just purchased a P2000 G3 (SAS model), which is supposed to have 6gig SAS. It appears we are only getting 3gig througput though.

I'm accessing a 24 disk RAID50 VDISK (24x600GB 10K SAS drives), and it maxes out at exactly 375MB/sec, which is theoretically the upper limit of 3Gb SAS. As soon as it hits this amount a "show host-port statistics" shows a non-zero queue depth. The servers are HP DL380 G7 (dual X5690 running Windows 2008 R2) and there is currently nothing using IOPS on the storage. We are using the SC08e HBA, with the latest driver.

Interestinigly enough, we have an older MSA2324sa G2 (with 500GB 7200rpm drives), which gets identical sequential read/write numbers, so I must assume there is something wrong here.

Everything in Windows and on the P2000 SMU shows 6gbit/sec connections, so what am I missing?

Thanks

Re: P2000 G3 performance issue

Johan Guldmyr — Mon, 31 Oct 2011 05:15:54 GMT

Hi, are the 6G SAS connections you see on both the disks and the host ports?

Re: P2000 G3 performance issue

OsiTr — Mon, 31 Oct 2011 06:48:11 GMT

Everything appears to be 6Gb.

I've just fiddled with the MPIO settings (changed to failover instead of round robin) and I'm getting closer to 500MB/sec now, which is more than 3Gbit/sec, so I think this might have fixed the problem. Would be better to be getting 700MB/sec, but we can live with this.

Re: P2000 G3 performance issue

Johan Guldmyr — Mon, 31 Oct 2011 07:52:13 GMT

Good.

Check out the ownerships of the vdisks/volumes. I believe you can right-click on them in the left-hand pane.

Should be good for your performance to split the load between the controllers if you haven't done this already.

Re: P2000 G3 performance issue

OsiTr — Mon, 31 Oct 2011 11:09:36 GMT

Thanks, I have split the vdisks between the two controllers for load balancing.