Chris Murphy wrote:
On Mon, Jul 24, 2017 at 5:27 AM, Cloud Admin <admin@xxxxxxxxxxxxxxxxxxx> wrote:
I am a little bit confused because the balance command is running since
12 hours and only 3GB of data are touched.
That's incredibly slow. Something isn't right.
Using btrfs-debug -b from btrfs-progs, I've selected a few 100% full chunks.
[156777.077378] f26s.localdomain sudo[13757]: chris : TTY=pts/2 ;
PWD=/home/chris ; USER=root ; COMMAND=/sbin/btrfs balance start
-dvrange=157970071552..159043813376 /
[156773.328606] f26s.localdomain kernel: BTRFS info (device sda1):
relocating block group 157970071552 flags data
[156800.408918] f26s.localdomain kernel: BTRFS info (device sda1):
found 38952 extents
[156861.343067] f26s.localdomain kernel: BTRFS info (device sda1):
found 38951 extents
That 1GiB chunk with quite a few fragments took 88s. That's 11MB/s.
Even for a hard drive, that's slow. I
This may be a stupid question , but are your pool of butter (or BTRFS
pool) by any chance hooked up via USB? If this is USB2.0 at 480mitb/s
then it is about 57MB/s / 4 drives = roughly 14.25 or about 11MB/s if
you shave off some overhead.
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