if you have >750 GB free you can simply remove one of the drives. btrfs device delete /dev/sd[x] /mnt #power off, replace device btrfs device add /dev/sd[y] /mnt
if not you can use an USB-SATA adapter or an eSata-Port and make the following: btrfs device add /dev/sd[y] /mnt btrfs device delete /dev/sd[x] /mnt #power off, replace device i avoid "btrfs device replace" because it's slower then add+delete and don't forget to update fstab ! 2016-10-22 0:07 GMT+02:00 Hugo Mills <h...@carfax.org.uk>: > On Sat, Oct 22, 2016 at 09:03:16AM +1100, Gareth Pye wrote: >> I've got a BTRFS array that is of mixed size disks: >> 2x750G >> 3x1.5T >> 3x3T >> And it's getting fuller than I'd like. The problem is that adding >> disks is harder than one would like as the computer only has 8 sata >> ports. Is it viable to do the following to upgrade one of the disks? >> >> A) Take array offline >> B) DD the contents of one of the 750G drives to a new 3T drive >> C) Remove the 750G from the system >> D) btrfs scan >> E) Mount array >> F) Run a balance >> >> I know that not physically removing the old copy of the drive will >> cause massive issues, but if I do that everything should be fine >> right? > > Yes. The one thing missing here is running > > # btrfs dev resize <devid>:max /mountpoint > > on the new device between steps E and F to allow the FS to use the > full amount of the device. Otherwise, it'll still be the same size as > the original. > > Hugo. > > -- > Hugo Mills | Great films about cricket: Batsman Begins > hugo@... carfax.org.uk | starring Christian Bail > http://carfax.org.uk/ | > PGP: E2AB1DE4 | -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
