On Sun, Feb 28, 2016 at 05:15:32PM -0300, Christian Robottom Reis wrote:
> I've managed to do the actual swap using a series of btrfs replace
> commands with no special arguments, and the system is now live and
> booting from the 256GB drives. However, I haven't actually noticed any
> difference in btrfs fi show output, and usage looks weird. Has anyone
> seen this before or have a clue as to who?
Yes, now I do, about 10 minutes after writing that mail. After a btrfs
replace, if the device being added is larger than the original device,
you need to issue:
btrfs fi resize <devid>:max <path>
to actually use that disk space. So for something like:
> Label: 'root' uuid: 670d1132-00dc-4511-a2f6-d28ce08b4d3a
> Total devices 2 FS bytes used 9.33GiB
> devid 1 size 13.97GiB used 11.78GiB path /dev/sda1
> devid 2 size 13.97GiB used 11.78GiB path /dev/sdb1
>
> Label: 'var' uuid: 815b3280-e90f-483a-b244-1d2dfe9b6e67
> Total devices 2 FS bytes used 56.14GiB
> devid 1 size 80.00GiB used 80.00GiB path /dev/sda3
> devid 2 size 80.00GiB used 80.00GiB path /dev/sdb3
You need to do:
btrfs fi resize 1:max /
btrfs fi resize 2:max /
btrfs fi resize 1:max /var
btrfs fi resize 2:max /var
And it looks great now:
Label: 'root' uuid: 670d1132-00dc-4511-a2f6-d28ce08b4d3a
Total devices 2 FS bytes used 9.34GiB
devid 1 size 40.00GiB used 10.78GiB path /dev/sda1
devid 2 size 40.00GiB used 10.78GiB path /dev/sdb1
Label: 'var' uuid: 815b3280-e90f-483a-b244-1d2dfe9b6e67
Total devices 2 FS bytes used 56.16GiB
devid 1 size 160.00GiB used 80.00GiB path /dev/sda3
devid 2 size 160.00GiB used 80.00GiB path /dev/sdb3
This would be nice to document in the manpage for replace; it would also
be a good addition to the best google hit for replace RAID-1:
http://unix.stackexchange.com/questions/227560/how-to-replace-a-device-in-btrfs-raid-1-filesystem
but I don't have enough reputation to do it myself.
--
Christian Robottom Reis | [+55 16] 3376 0125 | http://async.com.br/~kiko
| [+55 16] 991 126 430 | http://launchpad.net/~kiko
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