On Wed, Aug 24, 2016 at 11:13 PM, Thomas <thomas@xxxxxxxxxxxxx> wrote:
> Hi guys,
>
> quick question in regards to ceph -> rbd -> quotas per pool. I'd like to set
> a quota with max_bytes of a pool so that I can limit the amount a ceph
> client can use, like so:
>
> ceph osd pool set-quota pool1 max_bytes $(( 1024 * 1024 * 100 * 5))
>
> This is all working, e.g., if data gets written into the rbd mapped device
> (e.g. /dev/rbd0 --> /mnt/rbd0) and the pool reaches its capacity (full), it
> sets the ceph cluster health to WARN and notifies that the pool is full and
> the write stopps. However, when the write operation on the client stops it
> also hangs after that, e.g. the process can't be killed and waits for the
> device to respond, e.g.
>
> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
> root 9226 0.0 0.0 5836 744 ? D 12:50 0:00 \_ dd
> if=/dev/zero of=/mnt/rbd3/file count=500 bs=1M
>
> Increasing the quota of the pool helps recovering the cluster health but the
> write is stuck forever on the client (needs to be rebooted to get rid of the
> process).
>
> Ideas?
Hi Thomas,
You need kernel 4.7 for that to work - it will properly re-submit the
write after the quota is increased.
Thanks,
Ilya
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