Hello Chris, Thursday, May 15, 2008, 5:42:32 AM, you wrote:
CS> I wrote: CS> | I have a ZFS-based NFS server (Solaris 10 U4 on x86) where I am CS> | seeing a weird performance degradation as the number of simultaneous CS> | sequential reads increases. CS> To update zfs-discuss on this: after more investigation, this seems CS> to be due to file-level prefetching. Turning file-level prefetching CS> off (following the directions of the ZFS Evil Tuning Guide) returns CS> NFS server performance to full network bandwidth when there are lots CS> of simultaneous sequential reads. Unfortunately it significantly CS> reduces the performance of a single sequential read (when the server is CS> otherwise idle). Have you tried to disable vdev caching and leave file level prefetching? -- Best regards, Robert Milkowski mailto:[EMAIL PROTECTED] http://milek.blogspot.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
