Re: Multiple CephFS creation

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So, for the record, this doesn’t appears to work in Nautilus.



Does this mean that I should just count on my standby MDS to “step in” when a new FS is created?

> On Mar 31, 2020, at 3:19 AM, Eugen Block <eblock@xxxxxx> wrote:
> 
>> This has changed in Octopus. The above config variables are removed.
>> Instead, follow this procedure.:
>> 
>> https://docs.ceph.com/docs/octopus/cephfs/standby/#configuring-mds-file-system-affinity
> 
> Thanks for the clarification, IIRC I had troubles applying the mds_standby settings in Nautilus already, but I haven't verified yet so I didn't mention that in my response. I'll take another look at it.
> 
> 
> Zitat von Patrick Donnelly <pdonnell@xxxxxxxxxx>:
> 
>> On Mon, Mar 30, 2020 at 11:57 PM Eugen Block <eblock@xxxxxx> wrote:
>>> For the standby daemon you have to be aware of this:
>>> 
>>> > By default, if none of these settings are used, all MDS daemons
>>> > which do not hold a rank will
>>> > be used as 'standbys' for any rank.
>>> > [...]
>>> > When a daemon has entered the standby replay state, it will only be
>>> > used as a standby for
>>> > the rank that it is following. If another rank fails, this standby
>>> > replay daemon will not be
>>> > used as a replacement, even if no other standbys are available.
>>> 
>>> Some of the mentioned settings are for example:
>>> 
>>> mds_standby_for_rank
>>> mds_standby_for_name
>>> mds_standby_for_fscid
>>> 
>>> The easiest way is to have one standby daemon per CephFS and let them
>>> handle the failover.
>> 
>> This has changed in Octopus. The above config variables are removed.
>> Instead, follow this procedure.:
>> 
>> https://docs.ceph.com/docs/octopus/cephfs/standby/#configuring-mds-file-system-affinity
>> 
>> --
>> Patrick Donnelly, Ph.D.
>> He / Him / His
>> Senior Software Engineer
>> Red Hat Sunnyvale, CA
>> GPG: 19F28A586F808C2402351B93C3301A3E258DD79D
> 
> 
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