On Fri, Jun 22, 2018 at 6:22 AM Sergey Malinin <h...@newmail.com> 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 <d...@vanderster.com> 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@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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