On Wed, 6 Aug 2008, Will Murnane wrote: > I've got a pool which I'm currently syncing a few hundred gigabytes to > using rsync. The source machine is pretty slow, so it only goes at > about 20 MB/s. Watching "zpool iostat -v local-space 10", I see a > pattern like this (trimmed to take up less space):
The pattern is indeed strange. You have a fairly low data rate load shared across a large number of mirrors. Maybe the I/Os complete very quickly and are often split within the 10 second duration, with no I/Os at all sometimes. If you change to 60 seconds or 120 seconds does the reported data rate even out? It looks like the mirrors are split across two controllers, which is very good, but could expose a performance issue with one of the controllers. > Any suggestions what's going on? Any other diagnostics you'd like to > see? I'd be happy to provide them. Search for Jeff Bonwick's diskqual.sh script posted earlier to this forum. It was posted on Mon, 14 Apr 2008 15:49:41 -0700. It is quite handy for seeing if your disks are performing at a reasonably uniform rate. Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
