Hey Robert, How big of a file are you making? RAID-Z does not explicitly do the parity distribution that RAID-5 does. Instead, it relies on non-uniform stripe widths to distribute IOPS.
Adam On Jun 18, 2010, at 7:26 AM, Robert Milkowski wrote: > Hi, > > > zpool create test raidz c0t0d0 c1t0d0 c2t0d0 c3t0d0 \ > raidz c0t1d0 c1t1d0 c2t1d0 c3t1d0 \ > raidz c0t2d0 c1t2d0 c2t2d0 c3t2d0 \ > raidz c0t3d0 c1t3d0 c2t3d0 c3t3d0 \ > [...] > raidz c0t10d0 c1t10d0 c2t10d0 c3t10d0 > > zfs set atime=off test > zfs set recordsize=16k test > (I know...) > > now if I create a one large file with filebench and simulate a randomread > workload with 1 or more threads then disks on c2 and c3 controllers are > getting about 80% more reads. This happens both on 111b and snv_134. I would > rather except all of them to get about the same number of iops. > > Any idea why? > > > -- > Robert Milkowski > http://milek.blogspot.com > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss -- Adam Leventhal, Fishworks http://blogs.sun.com/ahl _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
