On Fri, Jun 18, 2010 at 02:21:15AM -0700, artiepen wrote: > 40MB/sec is the best that it gets. Really, the average is 5. I see 4, 5, 2, > and 6 almost 10x as many times as I see 40MB/sec. It really only bumps up to > 40 very rarely. > > As far as random vs. sequential. Correct me if I'm wrong, but if I used dd to > make files from /dev/zero, wouldn't that be sequential? I measure with zpool > iostat 2 in another ssh session while making files of various sizes. >
Yep, dd will generate sequential IO. Did you specify blocksize for dd? (bs=1024k for example). As a default dd does 4 kB IOs.. which won't be very fast. -- Pasi > This is a test system. I'm wondering, now, if I should just reconfigure with > maybe 7 disks and add another spare. Seems to be the general consensus that > bigger raid pools = worse performance. I thought the opposite was true... > -- > This message posted from opensolaris.org > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
