On Tue, Jun 05, 2012 at 06:19:00PM +0200, Helmut Hullen wrote: > Hallo, Jim, > > Du meintest am 05.06.12: > > > /dev/sda 11T 4.9T 6.0T 46% /btrfs > > [root@advanced ~]# btrfs fi show > > failed to read /dev/sr0 > > Label: none uuid: c21f1221-a224-4ba4-92e5-cdea0fa6d0f9 > > Total devices 12 FS bytes used 4.76TB > > devid 6 size 930.99GB used 429.32GB path /dev/sdf > > devid 5 size 930.99GB used 429.32GB path /dev/sde > > devid 8 size 930.99GB used 429.32GB path /dev/sdh > > devid 9 size 930.99GB used 429.32GB path /dev/sdi > > devid 4 size 930.99GB used 429.32GB path /dev/sdd > > devid 3 size 930.99GB used 429.32GB path /dev/sdc > > devid 11 size 930.99GB used 429.08GB path /dev/sdk > > devid 2 size 930.99GB used 429.32GB path /dev/sdb > > devid 10 size 930.99GB used 429.32GB path /dev/sdj > > devid 12 size 930.99GB used 429.33GB path /dev/sdl > > devid 7 size 930.99GB used 429.32GB path /dev/sdg > > devid 1 size 930.99GB used 429.09GB path /dev/sda > > > Btrfs v0.19-35-g1b444cd > > > df -h and btrfs fi show seem to be in good size agreement. Btrfs was > > created as raid1 metadata and raid0 data. I would like to delete the > > last 4 drives leaving 7T of space to hold 4.9T of data. My plan > > would be to remove /dev/sdi, j, k, l one at a time. After all are > > deleted run "btrfs fi balance /btrfs". > > I'd prefer > > btrfs device delete /dev/sdi > btrfs filesystem balance /btrfs > btrfs device delete /dev/sdj > btrfs filesystem balance /btrfs > > etc. - after every "delete" its "balance" run.
That's not necessary. Delete will move the blocks from the device being removed into spare space on the other devices. The balance is unnecessary. (In fact, delete and balance share quite a lot of code) > That may take a lot of hours - I use the last lines of "dmesg" to > extrapolate the needed time (btrfs produces a message about every > minute). > > And you can't use the console from where you have started the "balance" > command. Therefore I wrap this command: > > echo 'btrfs filesystem balance /btrfs' | at now ... or just put it into the background with "btrfs bal start /mountpoint &". You know, like everyone else does. :) Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- There are three mistaiks in this sentance. ---
signature.asc
Description: Digital signature
