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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>>>
>>> --
>>> Hugo Mills             | I can resist everything except temptation.
>>> hugo@... carfax.org.uk |
>>> http://carfax.org.uk/  |
>>> PGP: E2AB1DE4          |
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