On 25.02.2014 22:19, Hugo Mills wrote:
On Tue, Feb 25, 2014 at 01:05:51PM -0500, Jim Salter wrote:
370GB of 410GB used isn't really "fine", it's over 90% usage.
That said, I'd be interested to know why btrfs fi show /dev/sda3
shows 412.54G used, but btrfs fi df /home shows 379G used...
This is an FAQ...
btrfs fi show tells you how much is allocated out of the available
pool on each disk. btrfs fi df then shows how much of that allocated
space (in each category) is used.
What is the difference between the "used 371.11GB" and the "used
412.54GB" displayed by "btrfs fi show"?
The problem here is also in the FAQ: the metadata is close to full
-- typically something like 500-750 MiB of headroom is needed in
metadata. The FS can't allocate more metadata because it's allocated
everything already (total=used in btrfs fi show), so the solution is
to do a filtered balance:
btrfs balance start -dusage=5 /mountpoint
Of course that was the first thing I tried, and it didn't help *at* *all*:
# btrfs filesystem balance start -dusage=5 /home
Done, had to relocate 0 out of 415 chunks
#
... and it really didn't free anything.
On 02/25/2014 11:49 AM, Marcus Sundman wrote:
Hi
I get "No space left on device" and it is unclear why:
# df -h|grep sda3
/dev/sda3 413G 368G 45G 90% /home
# btrfs filesystem show /dev/sda3
Label: 'home' uuid: 46279061-51f4-40c2-afd0-61d6faab7f60
Total devices 1 FS bytes used 371.11GB
devid 1 size 412.54GB used 412.54GB path /dev/sda3
Btrfs v0.20-rc1
# btrfs filesystem df /home
Data: total=410.52GB, used=369.61GB
System: total=4.00MB, used=64.00KB
Metadata: total=2.01GB, used=1.50GB
#
So, 'data' and 'metadata' seem to be fine(?), but 'system' is a
bit low. Is that it? If so, can I do something about it? Or should
I look somewhere else?
I really wish I could get a warning before running out of disk
space, instead of everything breaking suddenly when there seems to
be lots and lots of space left.
- Marcus
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