Re: Questions on using BtrFS for fileserver

[Tomasz Chmielewski <tch@virtall.com>]

>> we are thinking about using BtrFS on standard hardware for a
>> fileserver with about 50T (100T raw) of storage (25×4TByte).
>> 
> 
> I would recommend carefully reading this thread titled: "1 week to
> rebuid 4x 3TB raid10 is a long time!"

So I have a 2 x 2.6 TB devices in btrfs RAID-1, 716G used. Linux 3.16.

One of the disks failed.

"btrfs device delete missing /home" is taking 9 days so far, on an idle 
system:

root      4828  0.3  0.0  17844   260 pts/1    D+   Aug11  38:18 btrfs 
device delete missing /home

There is some kind of btrfs debug info printed in dmesg which seems to 
tell me that the operation is working, like:

[744657.598810] BTRFS info (device sda4): relocating block group 
908951814144 flags 17
[744672.021612] BTRFS info (device sda4): found 4784 extents
[744688.604997] BTRFS info (device sda4): found 4784 extents
[744689.133397] BTRFS info (device sda4): relocating block group 
910025555968 flags 17
[744701.162678] BTRFS info (device sda4): found 4196 extents
[744725.000459] BTRFS info (device sda4): found 4196 extents


but other than that, the recovery time doesn't look optimistic to me, 
there is no ability to check the progress etc.


-- 
Tomasz Chmielewski
http://www.sslrack.com