On Thu, 27 Mar 2008, Neelakanth Nadgir wrote: > > This causes the sync to happen much faster, but as you say, suboptimal. > Haven't had the time to go through the bug report, but probably > CR 6429205 each zpool needs to monitor its throughput > and throttle heavy writers > will help.
I hope that this feature is implemented soon, and works well. :-) I tested with my application outputting to a UFS filesystem on a single 15K RPM SAS disk and saw that it writes about 50MB/second and without the bursty behavior of ZFS. When writing to ZFS filesystem on a RAID array, zpool I/O stat reports an average (over 10 seconds) write rate of 54MB/second. Given that the throughput is not much higher on the RAID array, I assume that the bottleneck is in my application. >> Are the 'zpool iostat' statistics accurate? > > Yes. You could also look at regular iostat > and correlate it. Iostat shows that my RAID array disks are loafing with only 9MB/second writes to each but with 82 writes/second. 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
