Erin wrote: > The issue that we have is that the first two vdevs were almost full, so we > will quickly be in the state where all writes will be on the 3rd vdev. It > would > also be useful to have better read performance, but I figured that solving the > write performance optimization would also help the read performance.
Because of ZFS dynamic striping, there will likely be a bias toward the new vdev for writes, but I don't think there will ever be a case when writes *only* go to the new vdev. Someone with deep internal ZFS knowledge could probably fill in more details. You didn't mention how wide your raidz2 vdevs are, but I would imagine that even with a larger proportion of writes going to the new vdev, your overall write performance (particularly on concurrent writes) will improve regardless. Eric _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
