On Wed, Mar 09, 2016 at 10:46:09PM +0100, Hendrik Friedel wrote: > Hello, > > I intend to move this subvolume to a new device. > btrfs fi show /mnt2/Data_Store/ > Label: 'Data_Store' uuid: 0ccc1e24-090d-42e2-9e61-d0a1b3101f93 > Total devices 1 FS bytes used 47.93GiB > devid 1 size 102.94GiB used 76.03GiB path /dev/sdb4 > > (fi usage at the bottom of this message) > > The new device (sda4) is 8G smaller unfortunately. > sda 8:0 0 111.8G 0 disk > └─sda4 8:4 0 103.5G 0 part > sdb 8:16 0 119.2G 0 disk > └─sdb4 8:20 0 111G 0 part /mnt2/Data_Store > > Thus, btrfs replace does not work > > What would you suggest now to move the FS (it does contain many subvolumes)?
btrfs dev resize to shrink it to (slightly smaller than) the replacement device, then btrfs replace should work. Then btrfs dev resize max to fill up the replacement device completely. Hugo. > I tried btrfs send /mnt2/Data_Store/read_only_snapshot/ | btrfs > receive /mnt/sda4/ > but this only created an empty subvolume /mnt/sda4/read_only_snapshot/ > > So, then > btrfs device add /dev/sda4 /mnt/Data_Store > btrfs balance start /mnt/Data_Store > btrfs device remove /dev/sdb4 /mnt/Data_Store > ? > > Or is there a better option? > > Regards, > Hendrik > > > btrfs fi usage /mnt2/Data_Store/ > Overall: > Device size: 102.94GiB > Device allocated: 74.03GiB > Device unallocated: 28.91GiB > Device missing: 0.00B > Used: 47.96GiB > Free (estimated): 53.24GiB (min: 53.24GiB) > Data ratio: 1.00 > Metadata ratio: 1.00 > Global reserve: 512.00MiB (used: 0.00B) > > Data,single: Size:69.00GiB, Used:44.67GiB > /dev/sdb4 69.00GiB > > Metadata,single: Size:5.00GiB, Used:3.29GiB > /dev/sdb4 5.00GiB > > System,single: Size:32.00MiB, Used:16.00KiB > /dev/sdb4 32.00MiB > > Unallocated: > /dev/sdb4 28.91GiB > > > --- > Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. > https://www.avast.com/antivirus > -- Hugo Mills | Well, sir, the floor is yours. But remember, the hugo@... carfax.org.uk | roof is ours! http://carfax.org.uk/ | PGP: E2AB1DE4 | The Goons
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