On Dec 23, 2009, at 7:45 AM, Markus Kovero wrote:
Hi, I threw 24GB of ram and couple latest nehalems at it and dedup=on seemed to cripple performance without actually using much cpu or ram. it's quite unusable like this.
What does the I/O look like? Try "iostat -zxnP 1" and see if there are a lot of small (2-3 KB) reads. If so, use "iopattern.ksh -r" to see how random
the reads are. http://www.richardelling.com/Home/scripts-and-programs-1/iopattern If you see 100% small random reads from the pool (ignore writes), then that is the problem. Solution TBD. -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
