On Sat, Jan 24, 2015 at 03:32:44PM +0100, Daniel Pocock wrote: > > > > I've got a RAID1 on two 1TB partitions, /dev/sda3 and /dev/sdb3 > > I'm adding two new disks, they will have bigger partitions /dev/sdc3 and > /dev/sdd3 > > I'd like the BtrFs to migrate from the old partitions to the new ones as > safely and quickly as possible and if it is reasonable to do so, keeping > it online throughout the migration. > > Should I do the following: > > btrfs device add /dev/sdc3 /dev/sdd3 /mnt/btrfs0 > btrfs device delete /dev/sda3 /dev/sdb3 /mnt/btrfs0 > > or should I do it this way: > > btrfs device add /dev/sdc3 /mnt/btrfs0 > btrfs device delete /dev/sda3 /mnt/btrfs0 > btrfs device add /dev/sdd3 /mnt/btrfs0 > btrfs device delete /dev/sdb3 /mnt/btrfs0 > > or is there some other way to go about it?
btrfs replace start /dev/sda3 /dev/sdc3 /mountpoint btrfs fi resize 3:max /mountpoint btrfs replace start /dev/sdb3 /dev/sdd3 /mountpoint btrfs fi resize 4:max /mountpoint The 3 and 4 in the resize commands should be the devid of the newly-added device. Hugo. -- Hugo Mills | I'll take your bet, but make it ten thousand francs. hugo@... carfax.org.uk | I'm only a _poor_ corrupt official. http://carfax.org.uk/ | PGP: 65E74AC0 | Capt. Renaud, Casablanca
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