* There are virtually no use cases for ec pools with m=1, this is a bad configuration as you can't have both availability and durability
* Due to weird internal restrictions ec pools below their min size can't recover, you'll probably have to reduce min_size temporarily to recover it * Depending on your version it might be necessary to restart some of the OSDs due to a bug (fixed by now) that caused it to mark some objects as degraded if you remove or restart an OSD while you have remapped objects * run "ceph osd safe-to-destroy X" to check if it's safe to destroy a given OSD -- 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 On Fri, Jul 5, 2019 at 1:17 AM Kyle <arad...@tma-0.net> wrote: > Hello, > > I'm working with a small ceph cluster (about 10TB, 7-9 OSDs, all Bluestore > on > lvm) and recently ran into a problem with 17 pgs marked as incomplete > after > adding/removing OSDs. > > Here's the sequence of events: > 1. 7 osds in the cluster, health is OK, all pgs are active+clean > 2. 3 new osds on a new host are added, lots of backfilling in progress > 3. osd 6 needs to be removed, so we do "ceph osd crush reweight osd.6 0" > 4. after a few hours we see "min osd.6 with 0 pgs" from "ceph osd > utilization" > 5. ceph osd out 6 > 6. systemctl stop ceph-osd@6 > 7. the drive backing osd 6 is pulled and wiped > 8. backfilling has now finished all pgs are active+clean except for 17 > incomplete pgs > > From reading the docs, it sounds like there has been unrecoverable data > loss > in those 17 pgs. That raises some questions for me: > > Was "ceph osd utilization" only showing a goal of 0 pgs allocated instead > of > the current actual allocation? > > Why is there data loss from a single osd being removed? Shouldn't that be > recoverable? > All pools in the cluster are either replicated 3 or erasure-coded k=2,m=1 > with > default "host" failure domain. They shouldn't suffer data loss with a > single > osd being removed even if there were no reweighting beforehand. Does the > backfilling temporarily reduce data durability in some way? > > Is there a way to see which pgs actually have data on a given osd? > > I attached an example of one of the incomplete pgs. > > Thanks for any help, > > Kyle_______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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