Thanks Ilya. I am indeed using lock ls command with workload ID
corresponding to the lock tag - works reasonably well. I was just wondering
if there were better options. Thanks for all the inputs.
Thanks
Shridhar
On Mon, Apr 13, 2020 at 4:23 AM Ilya Dryomov <idryomov(a)gmail.com> wrote:
Tying this with your other thread, if you always take
a lock before
mapping an image, you could just list the lockers. Unlike a watch,
a lock will never disappear behind your back ;)
Thanks,
Ilya
On Thu, Apr 9, 2020 at 9:24 PM Void Star Nill <void.star.nill(a)gmail.com>
wrote:
Thanks Ilya. Is there a more deterministic way to know where the volumes
are
mapped to?
Thanks,
Shridhar
On Wed, 8 Apr 2020 at 03:06, Ilya Dryomov <idryomov(a)gmail.com> wrote:
>
> A note of caution, though. "rbd status" just lists watches on the
> image header object and a watch is not a reliable indicator of whether
> the image is mapped somewhere or not.
>
> It is true that all read-write mappings establish a watch, but it can
> come and go due to network partitions, OSD crashes or general cluster
> issues. When the client notices that it lost a watch, it attempts to
> reestablish it, but this doesn't happen immediately.
>
> Thanks,
>
> Ilya
>
> On Tue, Apr 7, 2020 at 8:12 PM Void Star Nill <void.star.nill(a)gmail.com>
wrote:
> >
> > Thanks Jack. Exactly what I needed.
> >
> > Appreciate quick response.
> >
> > Regards,
> > Shridhar
> >
> >
> > On Tue, 7 Apr 2020 at 10:00, Jack <ceph(a)jack.fr.eu.org> wrote:
> >
> > > Hi,
> > >
> > > Checkout rbd status <image>
> > > For instance:
> > > root@ceph5-1:~# rbd status vm-903-disk-1
> > > Watchers:
> > > watcher=10.5.0.39:0/866486904 client.522682726
> > > cookie=140177351959424
> > >
> > > This is the list of clients for that image
> > > All mapping hosts are in it
> > >
> > >
> > > On 4/7/20 6:46 PM, Void Star Nill wrote:
> > > > Hello,
> > > >
> > > > Is there a way to find out all the clients where the volumes are
mapped
> > > > from a central point?
> > > >
> > > > We have a large fleet of machines that use ceph rbd volumes. For
some
> > > > maintenance purposes, we need
to find out if a volume is mapped
anywhere
> > > > before acting on it. Right now
we go and query each client
machines with
> > > > `rbd showmapped` commands. Is
there a variant of this CLI that
lists all
> > > > mappings on a single node
(ceph mon for instance)?
> > > >
> > > > Thanks,
> > > > Shridhar
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> > > >
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> > >
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