[ceph-users] Re: Forcibly move PGs from full to empty OSD

He means that if eg. you enforce 1 copy of a PG per rack, that any upmaps you enter don’t result in 2 or 3 in the same rack. If your CRUSH poilicy is one copy per *host* the danger is even higher that you could have data become unavailable or even lost in case of a failure. > On Mar 16, 2020, at 7:45 AM, Thomas Schneider &lt;74cmonty(a)gmail.com&gt; wrote: > > Hi Wido, > > can you please share some detailed instructions how to do this? > And what do you mean with "respect your failure domain"? > > THX > > Am 04.03.2020 um 11:27 schrieb Wido den Hollander: >> On 3/4/20 11:15 AM, Thomas Schneider wrote: >>> Hi, >>> >>> Ceph balancer is not working correctly; there's an open bug >>> <https://tracker.ceph.com/issues/43752> report, too. >>> >>> Until this issue is not solved, I need a workaround because I get more >>> and more warnings about "nearfull osd(s)". >>> >>> Therefore my question is: >>> How can I forcibly move PGs from full OSD to empty OSD? >> Yes, you could manually create upmap items to map PGs to a specific OSD >> and offload another one. >> >> This is what the balancer also does. Keep in mind though that you should >> respect your failure domain (host, rack, etc) when creating these mappings. >> >> Wido >> >>> THX >>> _______________________________________________ >>> ceph-users mailing list -- ceph-users(a)ceph.io >>> To unsubscribe send an email to ceph-users-leave(a)ceph.io >>> > _______________________________________________ > ceph-users mailing list -- ceph-users(a)ceph.io > To unsubscribe send an email to ceph-users-leave(a)ceph.io