On Sat, 21 Apr 2012, Wido den Hollander wrote:
> Hi,
>
> I was just playing with my libvirt driver and I noticed a stall.
>
> On one host I had running:
>
> for i in {0..8192}; do rbd create --size 64 image-$i; echo "created image-$i";
> done
>
> And on the other host I was running a pool-refresh in libvirt.
>
> As I was tailing the libvirt log I noticed that it had stalled, so I checked
> my other terminal and saw that the creation of new images had also stalled.
>
> This situation persisted for about ~20 seconds and then everything started to
> continue.
>
> At the moment of the stall libvirt was calling rbd_list and was not doing any
> rbd_stat yet.
>
> I'm trying to reproduce it here, but I wonder if there is a logical
> explanation for this situation?
>
> I'm running 0.44 on my cluster and 0.45 on the client btw.
Nothing comes to mind.. unless libvirt is doing something silly on
pool-refresh and actually modifies each image header (which would make
users stop and refresh).
If you can reproduce this with some logs (ideally the stalling client),
I'd love to see what's going on.
sage
--
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
