Re: bug? cant turn off rbd cache?

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On Thu, Dec 17, 2020 at 12:09 PM Philip Brown <pbrown@xxxxxxxxxx> wrote:
>
> Huhhh..
> It seems worthwhile to point out two inconsistencies, then.
>
> 1. the "old way", of  ceph config set global rbd_cache false
>
> doesnt require this odd redundant "global set global" syntax. It is confusing to users to have to specify "global" twice.
> may I suggest that the syntax for rbd config be adjusted, so that people can simply use
> rbd config global ...
> or
> rbd config client ...
>
> not
> rbd config global set (global/client)

Everyone has different opinions. "rbd help config global set" clearly
defines all the expected parameters. We can't be all things to all
people.

> 2. The fact that "ceph config set global rbd_cache false" works, seems to imply that putting
>
> [global]
> rbd cache = false
>
> in /etc/ceph/ceph.conf should work also.
>
> Except it doesnt.
> Even after fully shutting down every node in the ceph cluster and doing a cold startup.
>
> is that a bug?

Nope [1]. How would changing a random configuration file on a random
node affect the configuration on another node?

>
>
>
>
> ----- Original Message -----
> From: "Jason Dillaman" <jdillama@xxxxxxxxxx>
> To: "Philip Brown" <pbrown@xxxxxxxxxx>
> Cc: "dillaman" <dillaman@xxxxxxxxxx>, "ceph-users" <ceph-users@xxxxxxx>
> Sent: Thursday, December 17, 2020 8:24:59 AM
> Subject: Re:  Re: bug? cant turn off rbd cache?
>
> On Thu, Dec 17, 2020 at 11:21 AM Philip Brown <pbrown@xxxxxxxxxx> wrote:
> >
> > I guess I left out in my examples, where I tried rbd_cache as well, and failed
> >
> > # rbd config global set rbd_cache  false
> > rbd: invalid config entity: rbd_cache (must be global, client or client.<id>)
>
> But that's not a valid command -- you attempted to provide the
> configuration key name for the entity (as the error message is telling
> you).
>
> $ rbd config global set global rbd_cache false
> ... or ...
> $ rbd config global set client rbd_cache false
> ... or ...
> $ rbd config global set client.host_a rbd_cache false
>
> >
> >
>

[1] https://docs.ceph.com/en/latest/rados/configuration/ceph-conf/#config-sources

-- 
Jason
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