I am having a horrible time getting my servers to actually perform at the marketing that 3ware says I should be getting. I have used dd to copy from /dev/zero to and image file and I am only getting around 40-50 megs/sec. I figure that I should be getting better than that, but I'm not quite sure if my bench mark is even the right thing.
Currently things aren't too bad, but I am trying to setup glusterfs in a replicated/distributed setup (10 w/3 drives each). Unfortunately when I run dd against my gluster volume, I only get 3MBs. This is crazy slow to the point of completely unusable. I know the gluster team recommend using GB Ethernet, but I figure that I should at least be able to max out my current 100 Mb network pretty fast. I'm not even coming close though. So the question: I remember so coworkers previously say there were issues with 3ware raid cards, but that he was able to fix the problem. I wonder if I am hitting the same bug, or I'd maybe it is something else. I have turned on the write cache as well as blockdev --setra 16384, but it doesn't appear to help much. I did however try to enable the write cache and got a little speed increase, but nothing like I expected. Any thoughts on better ways to benchmark this, and also thoughts on tuning my 3ware controller? I am using a 32 but version of Linux, Hopefully that is enough info to point me in the right direction. --Dallin Jones /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
