> From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] > On Behalf Of Michael Ryder > > Everything on there is running at 4Gb, and we're not pushing the limits of the > ... > another set of Brocade-based HP switches, could push almost 800Mbps > (basically the limit of the NIC). But now on these QLogics, I can only get, > on > average ~350Mbps.
Since neither 800Mbps, nor 350Mbps is anywhere near the speed of your fabric (it's not even approaching the speed of 1GigE) I think you're experiencing a fault of measuring the speed, or else, the speed is limited elsewhere, such as the actual disk IO reading from the backup source. If you want to test it better, I'll suggest, create a new LUN which is much larger than all the ram in your system, and then "time dd if=/dev/zero bs=1024k | pv > /dev/newLUN" ... And then "time dd if=/dev/newLUN bs=1024k | pv > /dev/null" Be aware, buffering and caching can dramatically introduce inaccuracies in your measurements. So don't just read it for a few seconds and assume you have a result. Let it run for at least several minutes, if not all the way to completion. _______________________________________________ Tech mailing list Tech@lists.lopsa.org https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
