[sorry for the resend, signature again]
I am waiting for a window (later tonight) when I can try mounting the
btrfs export. Am I reading you guys correctly, that you think I should
be deleting drives from the array? Or is this a just in case? Thanks.
Jim Maloney
On 06/05/2012 01:04 PM, Hugo Mills wrote:
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.
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