[lxc-users] Limits kind of not working

[Pavol Cupka]

I want to use btrfs even though it is not "production ready", but I
like it for the features zfs is missing (balancing, growing/shrinking
volumes, dedup not eating your ram ...).

I wrote 50GB using dd if=/dev/zero and the quota show is showing this now
btrfs qgroup show -reF /var/lib/lxd/containers/c1/
qgroupid         rfer         excl     max_rfer     max_excl
--------         ----         ----     --------     --------
0/528         2.59GiB      1.72GiB         none     20.00GiB

so technicaly speaking it is working because excl is smaller then
max_excl but in practice 50GB is not smaller than 20GB.

I will try to ask in btrfs mailing list. thank you for your help

On Tue, Sep 12, 2017 at 9:39 AM, Marat Khalili <mkh at rqc.ru> wrote:
>> so you would recommend ZFS instead?
>
>
> I personally don't use ZFS (it's alien to Linux kernel and I don't want to
> deal with support problems arising from this situation). Many people claim
> it's magical and revolutionary, so it's up to you to test and decide.
>
> I use LXC on BTRFS with manually-enabled quotas, but I do have problems with
> it. If you want it simple I'd recommend to either forget quotas or use
> partitions.
>
>> well it looks like it gets set correctly also for btrfs
>>
>> btrfs qgroup show -reF /var/lib/lxd/containers/c1/
>> qgroupid         rfer         excl     max_rfer     max_excl
>> --------         ----         ----     --------     --------
>> 0/528         1.02GiB    156.54MiB
>
>
> Not sure why it doesn't work then, try calling `btrfs quota enable` for the
> filesystem. Are you sure you can really exceed the quota? You have it set
> for amount of exclusive data, so extents shared with other subvolumes do not
> count towards it.
>
>
> --
>
> With Best Regards,
> Marat Khalili
>
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