It's a very bad idea to accept data if you can't guarantee that it will be stored in way that tolerates a disk outage without data loss. Just don't.
Increase the number of coding chunks to 3 if you want to withstand two simultaneous disk failures without impacting availability. Paul 2018-05-08 1:46 GMT+02:00 Maciej Puzio <mkp37...@gmail.com>: > Paul, many thanks for your reply. > Thinking about it, I can't decide if I'd prefer to operate the storage > server without redundancy, or have it automatically force a downtime, > subjecting me to a rage of my users and my boss. > But I think that the typical expectation is that system serves the > data while it is able to do so. Since ceph by default does otherwise, > may I suggest that this is explained in the docs? As things are now, I > needed a trial-and-error approach to figure out why ceph was not > working in a setup that I think was hardly exotic, and in fact > resembled an ordinary RAID 6. > > Which leaves us with a mishmash of PG states. Is it normal? If not, > would I have avoided it if I created the pool with min_size=k=3 from > the start? In other words, does min_size influence the assignment of > PGs to OSDs? Or is it only used to force I/O shutdown in the event of > OSDs failures? > > Thank you very much > > Maciej Puzio > > > On Mon, May 7, 2018 at 5:00 PM, Paul Emmerich <paul.emmer...@croit.io> > wrote: > > The docs seem wrong here. min_size is available for erasure coded pools > and > > works like you'd expect it to work. > > Still, it's not a good idea to reduce it to the number of data chunks. > > > > > > Paul > > > > -- > > -- > > Paul Emmerich > > > > Looking for help with your Ceph cluster? Contact us at https://croit.io > > > > croit GmbH > > Freseniusstr. 31h > > 81247 München > > www.croit.io > > Tel: +49 89 1896585 90 > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
