On Mon, 12 Jan 2015, Dan Van Der Ster wrote: > Moving forward, I think it would be good for Ceph to a least document > this behaviour, but better would be to also detect when > zone_reclaim_mode != 0 and warn the admin (like MongoDB does). This > line from the commit which disables it in the kernel is pretty wise, > IMHO: "On current machines and workloads it is often the case that > zone_reclaim_mode destroys performance but not all users know how to > detect this. Favour the common case and disable it by default." Sounds good to me. Do you mind submitting a patch that prints a warning from either FileStore::_detect_fs()? That will appear in the local ceph-osd.NNN.log. Alternatively, we should send something to the cluster log (osd->clog.warning() << "...") but if we go that route we need to be careful that the logger it up and running first, which (I think) rules out FileStore::_detect_fs(). It could go in OSD itself although that seems less clean since the recommendation probably doesn't apply when using a backend that doesn't use a file system... Thanks! sage _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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