On Fri, Jun 18, 2010 at 1:52 AM, Curtis E. Combs Jr. <ceco...@uga.edu> wrote: > I am new to zfs, so I am still learning. I'm using zpool iostat to > measure performance. Would you say that smaller raidz2 sets would give > me more reliable and better performance? I'm willing to give it a > shot...
A ZFS pool is made up of vdevs. ZFS stripes the vdevs together to improve performance, similar in concept to how RAID0 works. The more vdevs in the pool, the better the performance will be. A vdev is made up one or more disks, depending on the type of vdev and the redundancy level that you want (cache, log, mirror, raidz1, raidz2, raidz3, etc). Due to the algorithms used for raidz, the smaller your individual raidz vdevs (the fewer disks), the better the performance. IOW a 6 disk raidz2 vdev will performance better than an 11 disk raidz2 vdev. So, you want your individual vdevs to be made up of as few physical disks as possible (for your size and redundancy requirements), and your pool to be made up of as many vdevs as possible. -- Freddie Cash fjwc...@gmail.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
