On Fri, 16 May 2008, James C. McPherson wrote: > >> 3) I've read that it's best practice to create the RAID set utilizing >> Hardware RAID utilities vice using ZFS raidz. Any wisdom on this? > > You've got a whacking great cache in the ST2540, so you might as > well make use of it.
Exporting each disk as a LUN for use by ZFS does not cause the 2540 to disable its cache. In fact, it is clear that this cache is quite valuable to ZFS write performance when NFS is involved. I am able to obtain 90MB/second NFS write performance from a single NFS client and using the 2540. Due to the inherent design of ZFS, it is not necessary for RAID writes to be synchronized as they must be for traditional mirroring or RAID5. If there is a power loss or crash, ZFS will discover where it left off, and bring all redundant copies to a coherent state. The 2540's cache will help protect against losing data if there is a power fail. 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
