17 Dec
2020
17 Dec
'20
6:48 p.m.
On Thu, Dec 17, 2020 at 10:41 AM Philip Brown <pbrown(a)medata.com> wrote:
Huhhh...
Its unfortunate that every google search i did for turning off rbd cache, specified
"put it in the [client] section".
Doh.
Maybe this would make a good candidate to update the ceph rbd docs?
As an open source project, I highly encourage you to give back in any
way you can [1].
Speaking of which.. what is the *exact* syntax for
that command please?
None of the below work:
rbd config global set rbd_cache false
rbd config global set rbd cache false
rbd config global set conf_rbd_cache false
rbd config global set rbd cache false
rbd config global set global cache false
and the error messages are not helpful. for example,
# rbd config global set cache false
rbd: invalid config entity: cache (must be global, client or client.<id>)
??? I already specified global??
... because a global configuration override can apply to all entities,
to all clients, or to specific clients (hence the examples for the
entity parameter).
but then
# rbd config global set global cache false
rbd: not rbd option: cache
... the configuration option is "rbd_cache" as documented here [2].
Very frustrating.
----- Original Message -----
From: "Jason Dillaman" <jdillama(a)redhat.com>
To: "Eugen Block" <eblock(a)nde.ag>
Cc: "ceph-users" <ceph-users(a)ceph.io>
Sent: Thursday, December 17, 2020 5:09:17 AM
Subject: [ceph-users] Re: bug? cant turn off rbd cache?
If you want to change global (librbd) settings, please use "rbd config
global set ..." (which is just a wrapper around "ceph config set
global ..."). The conf files only apply to the single host where they
exist.
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[1] https://docs.ceph.com/en/latest/start/documenting-ceph/
[2] https://docs.ceph.com/en/latest/rbd/rbd-config-ref/#cache-settings
--
Jason