-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 We are in a situation where we need to decrease PG for a pool as well. One thought is to live migrate with block copy to a new pool with the right number of PGs and then once they are all moved delete the old pool. We don't have a lot of data in that pool yet, that may not be feasible for you. - ---------------- Robert LeBlanc PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 On Tue, Sep 1, 2015 at 6:19 AM, Jan Schermer wrote: Hi, we're in the process of changing 480G drives for 1200G drives, which should cut the number of OSDs I have roughly to 1/3. My largest "volumes" pool for OpenStack volumes has 16384 PGs at the moment and I have 36K PGs in total. That equals to ~180 PGs/OSD and would become ~500 PG/s OSD. I know I can't actually decrease the number of PGs in a pool, and I'm wondering if it's worth working around to decrease the numbers? It is possible I'll be expanding the storage in the future, but probably not 3-fold. I think it's not worth bothering with and I'll just have to disable the "too many PGs per OSD" warning if I upgrade. I already put some new drives in and the OSDs seem to work fine (though I had to restart them after backfilling - they were spinning CPU for no apparent reason). Your thoughts? Thanks Jan _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -----BEGIN PGP SIGNATURE----- Version: Mailvelope v1.0.2 Comment: https://www.mailvelope.com wsFcBAEBCAAQBQJV5c1oCRDmVDuy+mK58QAAkXkP/1Wi4vBQ9BmZ6y11Eg+2 MxFl4ajDBYosJZz1jbnRvIKWWPlVbFHxbE0cFby6RtumT6DzpRNny+12TMcE aakwUuVR5RADh+oXzr4MU4xlPj6DWMAzSx8Bi5Mid6KVlJtK6Egsq9hCHD50 EwXg1PcEoagJL5QOHFcT/u89TlE26Enp2cl4tjwp3ltMWj1hay+J63gpTglS Tfmhi8hx22Q3RCWhVCFS+gWzWXjYPVfh3bONaSmK9BhqGjy98QJa6II+a6kL gAWG7XTJl1zAKko44cj7JSqHLmzyuBfoa/PuZMOjkEfDAOW6jdTU4VUAj3bd OK6E8sw8EMhbhlVOle6HvG1dO6bJhIt9uRxSVf+hZfFp87DoIHRAZ1J3b0PR zB6s8b+XfSph3gnU2ZsCc3wHuqM3MFXUcI7Vn7tvdV7HWXWBTGtPhokI5COk vgpLO1gvTTRzkNxmsLqwCTBFhFqK2zPw6xHpL1D5BcUYr/zS02+48ARZoUh7 pRteDdsnHOPSc5m1DcldvQtQelSMgfIyULVSXlZAukIWH9rsNt7Zishj3lvR W7z8/Ixr22TJ15mkVAAVwtlI813X59tPhmZrFmffP/GaF9vQpKUysEVZFhm1 rrTfBt6ZBa5nhYCatojpv91HM7WNeY0XJSrl+LnwGjP9avt/B2r1SoRG61Y0 d3BM =J7n1 -----END PGP SIGNATURE-----
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