Simon Banton wrote: > > At 10:04 -0400 24/9/07, Ross S. W. Walker wrote: > >How about trying your benchmarks with the 'disktest' utility from the > >LTP (Linux Test Project), > > Now fetched and installed - I'd be grateful for a suggestion as to an > appropriate disktest command line for a 4GB RAM twin CPU box with > 250GB RAID 1 array, because I think you had your tongue in your cheek > when you said: > > >it is also a > >lot easier to setup and use. Ok, so maybe it's easy for me... I forget that nothing is easy the first time using it. Ok, so here is the command I would use: Sequential reads: disktest -B 4k -h 1 -I BD -K 4 -p l -P T -T 300 -r /dev/sdX Sequential writes: disktest -B 4k -h 1 -I BD -K 4 -p l -P T -T 300 -w /dev/sdX Random writes: disktest -B 4k -h 1 -I BD -K 4 -p r -P T -T 300 -r /dev/sdX Random writes: disktest -B 4k -h 1 -I BD -K 4 -p r -P T -T 300 -w /dev/sdX Description of the options used: -B 4k = 4k block ios -h 1 = 1 second heartbeat -I BD = block device, direct io -K 4 = 4 threads, or 4 outstanding/overlapping ios, typical pattern (use -K 1 for the raw performance of single drive, aka dd type output) -p <l|r> = io type, l=linear, r=random -P T = output metrics type "Throughput" -T 300 = duration of test 300 seconds -r = read -w = write These tests will run across the whole disk/partition and the write tests WILL BE DESTRUCTIVE so be warned! -Ross ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.