Yes, have it disabled already (for their datadirs).
Tomasz Chmielewski
https://lxadm.com
On 2016-09-20 16:30, Peter Becker wrote:
for the future. disable COW for all database containers
2016-09-20 9:28 GMT+02:00 Peter Becker <floyd....@gmail.com>:
* If this NOT solve the "No space left" issues you must remove old
snapshots.
2016-09-20 9:27 GMT+02:00 Peter Becker <floyd....@gmail.com>:
Data, RAID1: total=417.12GiB, used=131.33GiB
You have 417(total)-131(used) blocks wo are only partial filled.
You should balance your file-system.
At first you need some free space. You could remove some files / old
snapshots etc. or you add a empty USB-Stick with min. 4 GB to your
BTRFS-Pool (after balancing complete you can remove the stick from
the
pool).
But at first you should try to free emty data and meta data blocks:
btrfs balance start -musage=0 /mnt
btrfs balance start -dusage=0 /mnt
Then you an run a full balance or a partial balance:
#a partial balance with reorganize data blocks less then 50% filled
btrfs balance start -dusage=50 /mnt
#or a full balance
btrfs balance start /mnt
Because of a possible bug you should disable all snapshot scripts
(like cron-jobs) during the balance.
If this solve the "No space left" issues you must remove old
snapshots.
2016-09-20 8:58 GMT+02:00 Hugo Mills <h...@carfax.org.uk>:
On Tue, Sep 20, 2016 at 03:47:14PM +0900, Tomasz Chmielewski wrote:
How to understand the following "btrfs fi show" output?
This gives a write-up (and worked example) of an answer to your
question:
https://btrfs.wiki.kernel.org/index.php/FAQ#Understanding_free_space.2C_using_the_original_tools
If you've got any follow-up questions after reading it, please do
come back and we can try to improve the FAQ entry. :)
Hugo.
# btrfs fi show /var/lib/lxd
Label: 'btrfs' uuid: f5f30428-ec5b-4497-82de-6e20065e6f61
Total devices 2 FS bytes used 136.18GiB
devid 1 size 423.13GiB used 423.13GiB path /dev/sda3
devid 2 size 423.13GiB used 423.13GiB path /dev/sdb3
Why is it "size 423.13GiB used 423.13GiB"? Is it full?
I had "No space left" on this filesystem just yesterday (running
kernel 4.7.4). This is btrfs RAID-1 on SSD disks. This filesystem
is
used for 20-30 LXD containers with different roles (mongo, mysql,
postgres databases, webservers etc.), around 150 read-only
snapshots, btrfs compression is disabled.
Both "btrfs fi df" and "df -h" show plenty of space:
# btrfs fi df /var/lib/lxd
Data, RAID1: total=417.12GiB, used=131.33GiB
System, RAID1: total=8.00MiB, used=80.00KiB
Metadata, RAID1: total=6.00GiB, used=4.86GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 424G 137G 286G 33% /var/lib/lxd
Tomasz Chmielewski
https://lxadm.com
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