On Thu, Jun 18, 2009 at 12:12:16PM +0200, Cor Beumer - Storage Solution Architect wrote: > > What they noticed on the the X4500 systems, that when the zpool became > filled up for about 50-60% the performance of the system > did drop enormously. > They do claim this has to do with the fragmentation of the ZFS > filesystem. So we did try over there putting an S7410 system in with > about the same config on disks, 44x 1TB SATA BUT 4x 18GB WriteZilla (in > a stripe) we were able to get much and much more i/o's from the system > the the comparable X4500, however they did put it in production for a > couple of weeks, and as soon as the ZFS filesystem did come in the range > of about 50-60% filling the did see the same problem.
We had a similar problem with a T2000 and 2 TB of ZFS storage. Once the usage reached 1 TB, the write performance dropped considerably and the CPU consumption increased. Our problem was indirectly a result of fragmentation, but it was solved by a ZFS patch. I understand that this patch, which fixes a whole bunch of ZFS bugs, should be released soon. I wonder if this was your problem. -- -Gary Mills- -Unix Support- -U of M Academic Computing and Networking- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
