16 Sep
2020
16 Sep
'20
1:38 p.m.
Hi David, Jan,
Terribly terribly sorry, I just noticed that the imaptest program used
this 'DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA' to test with,
which is 537 bytes. This explains at least why half the messages were so
small. So conclusion is that.
- either the hint is not correctly set to do the passive compression.
- or the passive compression is not working when this hint is set.
Thanks,
Marc
-----Original Message-----
Cc: ceph-users
Subject: Re: [ceph-users] ceph rbox test on passive compressed pool
On 09/11 09:36, Marc Roos wrote:
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/56d6c900cc9ec
07dfb98ef2abac07aae466b7610/src/librmb/rados-storage-impl.cpp#L75
I was trying to look into this a bit :), can you give me more info about
the OSDs that you are using?
What filesystem are they on?
Cheers!
Thanks,
Marc
-----Original Message-----
Cc: jan.radon
Subject: Re: [ceph-users] 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(a)f1-outsourcing.eu>
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(a)ceph.io
To unsubscribe send an email to ceph-users-leave(a)ceph.io
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
--
David Caro