On Thu, 7 Aug 2008, Andrey Dmitriev wrote: > I am sure.. Nothing but this box ever accessed them. All NFS access > was stopped to the box. The RAID sets are identical (9 drive RAID5). > We tested the file system almost non-stop for almost two days and > never did I ever get it to write above 4 megs (on average it was > below 3 megs). The second I destroyed a file system with 1.8TB on it > (3rd one from the top), it started writing 300megs/sec. This system > was in production for over a year, and it always performed top notch > (we use it for D2D backups)
I see. When you say "close to full", how much space was left, and what was the percentage full? Bad things happen when any filesystem gets full. ZFS has to search harder for free blocks and the remaining free blocks may be in very poor locations, causing lots of fragmentation. The disks spend most of their time doing seeks rather than transferring data. The UFS filesystem "solves" this by not allowing the filesystem to become full. 100% is not really 100% and only the root user is allowed to take the filesystem to the artificial "100%". 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
