It happened to me once but I didn't really have any time to investigate how exactly it behaves. Some VMs had to be rebooted, other VMs survived but I can't tell if for example rewriting the same block is possible. Only writes should block in any case.
I don't know what happens to Cinder, but I don't expect it to work - it will either timeout or/then fail with 5xx error. Jan > On 19 Oct 2015, at 11:32, Bharath Krishna <[email protected]> wrote: > > I mean cluster OSDs are physically full. > > I understand its not a pretty way to operate CEPH allowing to become full, > but I just wanted to know the boundary condition if it becomes full. > > Will cinder create volume operation creates new volume at all or error is > thrown at Cinder API level itself stating that no space available? > > When IO stalls, will I be able to read the data from CEPH cluster I.e can > I still read data from existing volumes created from CEPH cluster? > > Thanks for the quick reply. > > Regards > M Bharath Krishna > > On 10/19/15, 2:51 PM, "Jan Schermer" <[email protected]> wrote: > >> Do you mean when the CEPH cluster (OSDs) is physically full or when the >> quota is reached? >> >> If CEPH becomes full it just stalls all IO (maybe just write IO, but >> effectively same thing) - not pretty and you must never ever let it >> become full. >> >> Jan >> >> >>> On 19 Oct 2015, at 11:15, Bharath Krishna <[email protected]> >>> wrote: >>> >>> Hi >>> >>> What happens when Cinder service with CEPH backend storage cluster >>> capacity is FULL? >>> >>> What would be the out come of new cinder create volume request? >>> >>> Will volume be created with space not available for use or an error >>> thrown from Cinder API stating no space available for new volume. >>> >>> I could not try this in my environment and fill up the cluster. >>> >>> Please reply if you have ever tried and tested this. >>> >>> Thank you. >>> >>> Regards, >>> M Bharath Krishna >>> _______________________________________________ >>> ceph-users mailing list >>> [email protected] >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
