Hi David, Just to let you know, this hint is being set, what is the reason for ceph of doing only half the objects? Can it be that there is some issue with my osd's? Like some maybe have an old fs (still using disk not volume)? Is this still to be expected or does ceph under pressure drop compressing? https://github.com/ceph-dovecot/dovecot-ceph-plugin/blob/56d6c900cc9ec07dfb98ef2abac07aae466b7610/src/librmb/rados-storage-impl.cpp#L75 Thanks, Marc -----Original Message----- Cc: jan.radon Subject: Re: ceph rbox test on passive compressed pool The hints have to be given from the client side as far as I understand, can you share the client code too? Also,not seems that there's no guarantees that it will actually do anything (best effort I guess): https://docs.ceph.com/docs/mimic/rados/api/librados/#c.rados_set_alloc_hint Cheers On 6 September 2020 15:59:01 BST, Marc Roos <M.Roos@xxxxxxxxxxxxxxxxx> wrote: I have been inserting 10790 exactly the same 64kb text message to a passive compressing enabled pool. I am still counting, but it looks like only half the objects are compressed. mail/b08c3218dbf1545ff430000052412a8e mtime 2020-09-06 16:27:39.000000, size 63580 mail/00f6043775f1545ff430000052412a8e mtime 2020-09-06 16:25:57.000000, size 525 mail/b875f40571f1545ff430000052412a8e mtime 2020-09-06 16:25:53.000000, size 63580 mail/e87c120b19f1545ff430000052412a8e mtime 2020-09-06 16:24:25.000000, size 525 I am not sure if this should be expected from passive, these docs[1] hint that passive 'compress if hinted COMPRESSIBLE'. From that I would conclude that all text messages should be compressed. A previous test with a 64kb gzip attachment seemed to not compress, although I did not look at all object sizes. on 14.2.11 [1] https://documentation.suse.com/ses/5.5/html/ses-all/ceph-pools.html #sec-ceph-pool-compression https://docs.ceph.com/docs/mimic/rados/operations/pools/ ________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx -- Sent from my Android device with K-9 Mail. Please excuse my brevity. _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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