Am 28.06.2016 um 09:06 schrieb Christian Balzer: > > Hello, > > On Tue, 28 Jun 2016 08:34:26 +0200 Stefan Priebe - Profihost AG wrote: > >> Am 27.06.2016 um 02:14 schrieb Christian Balzer: >>> On Sun, 26 Jun 2016 19:48:18 +0200 Stefan Priebe wrote: >>> >>>> Hi, >>>> >>>> is there any option or chance to have auto repair of pgs in hammer? >>>> >>> Short answer: >>> No, in any version of Ceph. >>> >>> Long answer: >>> There are currently no checksums generated by Ceph and present to >>> facilitate this. >> >> Yes but if you have a replication count of 3 ceph pg repair was always >> working for me since bobtail. I've never seen corrupted data. >> > That's good and lucky for you. > > Not seeing corrupted data also doesn't mean there wasn't any corruption, > it could simply mean that the data in question wasn't used or overwritten > before being read again. Sure that's correct ;-) It just has happened so often that i thought this could not always be the case. We had a lot of kernel crashes the last month regarding XFS and bcache. > In the handful of scrub errors I ever encountered there was one case where > blindly doing a repair from the primary PG would have been the wrong thing > to do. Are your sure it really simply uses the primary pg? i always thought it compares the sizes of the object and date with a replication factor 3. >>> If you'd run BTRFS or ZFS with filestore you'd be closer to an >>> automatic state of affairs, as these filesystems do strong checksums >>> and check them on reads and would create an immediate I/O error if >>> something got corrupted, thus making it clear which OSD is in need of >>> the hammer of healing. >> >> Yes but at least BTRFS is still not working for ceph due to >> fragmentation. I've even tested a 4.6 kernel a few weeks ago. But it >> doubles it's I/O after a few days. >> > Nobody (well, certainly not me) suggested to use BTRFS, especially with > Bluestore "around the corner". > > Just pointing out that it has the necessary checksumming features. Sure. sorry. Stefan _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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