On 03/27/2018 06:40 AM, Tracy Reed wrote: > Hello all, > > It seems I have underprovisioned storage space for my mons and my > /var/lib/ceph/mon filesystem is getting full. When I first started using > ceph this only took up tens of megabytes and I assumed it would stay > that way and 5G for this filesystem seemed luxurious. Little did I know > that mon was going to be storing multiple gigs of data! That's still a > trivial amount of course but larger than what I expected and now I have > to do some work to rebuild my monitors on bigger storage. > > I'm curious: Exactly what is being stored and is there any way to trim > it down a bit? It has slowly grown over time. I've already run a compact > on it which gained me only a few percent. >
The MONs keep a history of OSDMaps and other maps. Normally these maps are trimmed from the database, but if one or more PGs are not active+clean the MONs will keep a large history to get old OSDs up to speed which might be needed to bring that PGs to a clean state again. What is the status of your Ceph cluster (ceph -s) and what version are you running? And yes, make sure your MONs do have a tens of GBs available should they need it for a very long recovery. For example, I'm working on a 2200 OSD cluster which has been doing a recovery operation for a week now and the MON DBs are about 50GB now. Wido > Thanks! > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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