> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- > boun...@opensolaris.org] On Behalf Of Lanky Doodle > > In that case, wouldn't it be better to, as you say, start with a 6 drive Z2, then > just keep adding drives until the case is full, for a single Z2 zpool?
Doesn't work that way. You can create a vdev, and later, you can add more vdev's. So you can create a raidz now, and later you can add another raidz. But you cannot create a raidz now, and later just add onesy-twosy disks to increase the size incrementally. > Or even Z3, if that's available now? Raidz3 is available now. There is only one thing to be aware of. ZFS resilvering is very inefficient for typical usage scenarios. The time to resilver divides by the number of vdev's in the pool (meaning 10 mirrors will resilver 10x faster than an equivalently sized raidzN) and the time to resilver is doubled when you have several disks within the vdev. Due to inefficiency, we're talking about 12 hours (on my server) to resilver a 1TB disk which is around 70% used. This would have been ~3 weeks if I had one big raidz3. So it matters. Your multiple raidz vdev's of each 5-6 disks is a reasonable compromise. > I have an 11x 5.1/4 bay case, with 3x 5-in-3 hot swap caddies giving me 15 > drive bays. Hence the plan to start with 5, then 10, then all the way to 15. > > This seems a more logical (and cheaper) solution than keep replacing with > bigger drives as they come to market. 'Course, you can also replace bigger drives as they come to market, too. ;-) If you've got 5 disks in a raidz... First scrub it. Then, replace one disk with a larger disk, and wait for resilver. Replace each disk, one by one, with larger disks. And eventually when you do the last one ... Your pool becomes larger. (Depending on your defaults, manual intervention may be required to make the pool autoexpand when the devices have all been upgraded.) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
