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@xxxxxxxxx> wrote:
>
> Thanks Jack. Exactly what I needed.
>
> Appreciate quick response.
>
> Regards,
> Shridhar
>
>
> On Tue, 7 Apr 2020 at 10:00, Jack <ceph@xxxxxxxxxxxxxx> 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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> > To unsubscribe send an email to ceph-users-leave@xxxxxxx
> >
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