On Sat, Jul 31, 2010 at 03:21:40PM +0000, Marco wrote: > >> sda 84.02 > >> sdb 113,69 > >> md2 8,01 > >> > >> md2 and his meber have a very different ratio.... > > > >Strange isn't it. And the ratios are the other-way-around to what I get. > >I don't currently understand why ... but it might not be at all relevant to > >the speed difference. > > Hi, > i did some test on a different machine with centos 5.5 and ICH10 disk > controller. On this machine i have no performance issue: hdparm -t return the > same value (about 107 MB/s) on both /dev/md0 and its members > > I measured the "ratio" and i obtained 8.02 for md0 and 505 for meber disk. I it > seems that the "raito" is not so relevant for this issue. What do you think ? > In this case the md device was not mounted. > I also tried several different io scheduler whithout noting any effect on > sequential read eprformance. > > Marco maybe try out raid10,f2 instead of raid1. You should get about double the sequential read performance out of your raids, then, eg tested with hdparm. best regards keld -- 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
