On Sun, 2007-04-01 at 14:19 +0200, Jan Engelhardt wrote: > Hello list, > > > normally, I'd think that combining drives into a raid1 array would give > me at least a little improvement in read speed. In my setup however, > this does not seem to be the case. > > 14:16 opteron:/var/log # hdparm -t /dev/sda > Timing buffered disk reads: 170 MB in 3.01 seconds = 56.52 MB/sec > 14:17 opteron:/var/log # hdparm -t /dev/md3 > Timing buffered disk reads: 170 MB in 3.01 seconds = 56.45 MB/sec > (and dd_rescue shows the same numbers) > > The raid array was created using > # mdadm -C /dev/md3 -b internal -e 1.0 -l 1 -n 2 /dev/sd[ab]3 > > > Jan >From section 9.5 in [FAQ] "To check out speed and performance of your RAID systems, do NOT use hdparm. It won't do real benchmarking of the arrays." <snip> I might recommend bonnie++. I think I've seen accepted benchmarks here using bonnie++. [FAQ] http://tldp.org/HOWTO/html_single/Software-RAID-HOWTO/#s9 -- Henrik Holst <holst@xxxxxxxxxxx> - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
