On Tue, 14 Feb 2012, Toby Corkindale <toby.corkindale@strategicdata.com.au> wrote:
The manual pages make it look like you can only set the RAID options at mkfs time, with there being no way to adjust this per file, dir, subvolume or whatever.
Surely it will get such things as the filesystem develops. The Debian installation process supports installing to a degraded RAID-1 array and then adding a second disk after the installation is finished. It seems quite reasonable to expect the same functionality from BTRFS. Also there need to be options to do things such as migrate from a disk with SMART errors to a new disk, to support systems with hot-swap disks but no hardware RAID (which I've used in production), and do lots of other things. If they are going to do RAID seriously then they need comparable operations to all the things are are used to doing with software RAID and ideally most of the things we are used to doing with hardware RAID (such as adding a disk to a RAID-5 set and making a RAID-6). -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/