> Op 29 november 2017 om 14:56 schreef Jason Dillaman <[email protected]>: > > > We experienced this problem in the past on older (pre-Jewel) releases > where a PG split that affected the RBD header object would result in > the watch getting lost by librados. Any chance you know if the > affected RBD header objects were involved in a PG split? Can you > generate a gcore dump of one of the affected VMs and ceph-post-file it > for analysis? >
I asked again for the gcore, but they can't release it as it contains confidential information about the Instance and the Ceph cluster. I understand their reasoning and they also understand that it makes it difficult to debug this. I am allowed to look at the gcore dump when on location (next week), but I'm not allowed to share it. > As for the VM going R/O, that is the expected behavior when a client > breaks the exclusive lock held by a (dead) client. > We noticed another VM going into RO when a snapshot was created. When checking last week this Instance had a watcher, but after the snapshot/RO we found out it no longer has a watcher registered. Any suggestions or ideas? Wido > On Wed, Nov 29, 2017 at 8:48 AM, Wido den Hollander <[email protected]> wrote: > > Hi, > > > > On a OpenStack environment I encountered a VM which went into R/O mode > > after a RBD snapshot was created. > > > > Digging into this I found 10s (out of thousands) RBD images which DO have a > > running VM, but do NOT have a watcher on the RBD image. > > > > For example: > > > > $ rbd status volumes/volume-79773f2e-1f40-4eca-b9f0-953fa8d83086 > > > > 'Watchers: none' > > > > The VM is however running since September 5th 2017 with Jewel 10.2.7 on the > > client. > > > > In the meantime the cluster was already upgraded to 10.2.10 > > > > Looking further I also found a Compute node with 10.2.10 installed which > > also has RBD images without watchers. > > > > Restarting or live migrating the VM to a different host resolves this issue. > > > > The internet is full of posts where RBD images still have Watchers when > > people don't expect them, but in this case I'm expecting a watcher which > > isn't there. > > > > The main problem right now is that creating a snapshot potentially puts a > > VM in Read-Only state because of the lack of notification. > > > > Has anybody seen this as well? > > > > Thanks, > > > > Wido > > _______________________________________________ > > ceph-users mailing list > > [email protected] > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > -- > Jason _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
