On Fri, Jun 22, 2018 at 6:22 AM Sergey Malinin <hell@xxxxxxxxxxx> wrote:
From http://docs.ceph.com/docs/mimic/rados/troubleshooting/troubleshooting-pg/ :"Now 1 knows that these object exist, but there is no live ceph-osd who has a copy. In this case, IO to those objects will block, and the cluster will hope that the failed node comes back soon; this is assumed to be preferable to returning an IO error to the user."
This is definitely the default and the way I recommend you run a cluster. But do keep in mind sometimes other layers in your stack have their own timeouts and will start throwing errors if the Ceph library doesn't return an IO quickly enough. :)
-Greg
_______________________________________________On 22.06.2018, at 16:16, Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote:Hi all,
Quick question: does an IO with an unfound object result in an IO
error or should the IO block?
During a jewel to luminous upgrade some PGs passed through a state
with unfound objects for a few seconds. And this seems to match the
times when we had a few IO errors on RBD attached volumes.
Wondering what is the correct behaviour here...
Cheers, Dan
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
