Orvar Korvar wrote: > Ok, that was a very good explanation. Thanx a lot! > > So, I have a 8 ports SATA card, and I have one ZFS raid with 4 discs, > 500gb each. > These 4 discs are one vdev, right? Yes you have a pool with 1 4 disk *RAIDZ* type vdev. > And then I can add 4 more discs and create another vdev of them. > Yes you can add a second 4 disk RAIDZ type vdev to the zpool. > 1) Vdev of 4 samsung 500GB discs. -> zpool, consisting of 1.5TB > 2) Vdev of 4 drives 1TB discs -> add to zpool, 3TB + 1.5TB = 4.5TB. > > So I can add 2) to my existing zpool, right? Is it better if all > drives have the same capacity, throughout the zpool? Yes you can add 4 1TB drives just as you described.
No there isn't (to my knowledge) any benefit from making all the drives in a *zpool* the same size. However making all the drives in a *vdev* (of almost any type) the same size has definite advantages. The only reason you might want to upgrade your 500GB disks to 1TB disks, is if you wanted to backup your data, destroy the pool, and then create a single 7+1 RAIDZ vdev, so that you only lose 1 disk to parity instead of 2. Or create a 6+2 disk RAIDZ2, where you still lose 2 disks to parity, but gain additional redundancy. But that destroy-recreate operation is costly in several ways, so you'll want to think hard before undertaking it. :) -Kyle _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
