On Thu, 4 May 2017, Adam Carheden wrote: > How do I check the full ratio and nearfull ratio of a running cluster? > > I know i can set 'mon osd full ratio' and 'mon osd nearfull ratio' in > the [global] setting of ceph.conf. But things work fine without those > lines (uses defaults, obviously). > > They can also be changed with `ceph tell mon.* injectargs > "--mon_osd_full_ratio .##` and `ceph tell mon.* injectargs > "--mon_osd_nearfull_ratio .##`, in which case the running cluster's > notion of full/nearfull wouldn't match ceph.conf. Sort of.. those configs set the initial values, but the ones that are applied are actually in PGMap. Look at 'ceph pg dump | head' and adjust the values with 'ceph pg set_full_ratio' and 'ceph pg set_nearfull_ratio'. Note that this is improved and cleaned up in luminous (the commands swithc to 'ceph osd set-[near]full-ratio' and the values move into the OSDMap, aong with the other full configurables (failsafe ratio, and ratio at which backfill is stopped). > How do I have monitors report the values they're currently running with? > (i.e. is there something like `ceph tell mon.* dumpargs...`?) > > It seems like this should be a pretty basic question, but my Googlefoo > is failing me this morning. > > For those who find this post and want to check how full their OSDs are > rather than checking the full/nearfull limits, `ceph osd df tree` seems > to be the hot ticket. > > > And as long as I'm posting, I may as well get my next question out of > the way. My minimally used 4-node, 16 OSD test cluster looks like this: > # ceph osd df tree > .... > MIN/MAX VAR: 0.75/1.31 STDDEV: 0.84 > > When should one be concerned about imbalance? What values for > min/max/stddev represent problems where reweighing an OSD (or other > action) is What sort of advisable? Is that the purpose of nearfull or > does one need to monitor individual OSDs too? You can use 'osd reweight-by-utilization' to reduce the variance. sage _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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