> From: Bob Friesenhahn [mailto:bfrie...@simple.dallas.tx.us] > > On Mon, 19 Apr 2010, Edward Ned Harvey wrote: > > > > Just be aware that if *any* of your devices fail, all is lost. > (Because > > you've said it's configured as a nonredundant stripe.) > > The good news is that it is easy to convert any single-disk vdev into > a mirror vdev. It is also easy to convert a mirror vdev into a > single-disk vdev. This means that you can upgrade your simple > "stripe" into a stripe of mirrors.
A really good point. Yes, you can take a 2-disk stripe volume, and make a 4-disk stripe of mirrors volume of the same size. No, you cannot take a 2-disk volume, and make it a 3-disk raidz volume. Unless you're willing to destroy and restore all your data. Also, since the question was "can I expand my volume just by adding more disks" this is worth mention too: Whatever type of volume you have, be it a stripe, a mirror, a stripe of mirrors, a raidz set, or whatever ... You can always expand the volume by just adding disks to it. But if you're adding non-redundant disks, you're not fully redundant anymore. If you add a non-redundant disk to some pool that had redundancy, and your new disk dies, then your pool is lost. If you have a raidz volume, of "n" disks, you cannot simply add 1 disk, and have a raidz volume of "n+1" disks. I don't know if I'm just adding to confusion here. Sorry if it's not more clear. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
