On 05/21/2014 05:32 PM, John Spray wrote:
In response to #8010[1], I'm looking at making it possible to
explicitly disable CephFS, so that the (often unused) filesystem pools
don't hang around if they're unwanted.
The administrative behavior would change such that:
* To enable the filesystem it is necessary to create two pools and
use "ceph newfs <metadata> <data>"
* There's a new "ceph rmfs" command to disable the filesystem and
allow removing its pools
* Initially, the filesystem is disabled and the 'data' and 'metadata'
pools are not created by default
There's an initial cut of this on a branch:
https://github.com/ceph/ceph/commits/wip-nullfs
Questions:
* Are there strong opinions about whether the CephFS pools should
exist by default? I think it makes life simpler if they don't,
avoiding "what the heck is the 'data' pool?" type questions from
newcomers.
+1
We simpler the clusters are, the better imho. A lot of users don't
require CephFS, so don't enable what ain't used.
* Is it too unfriendly to require users to explicitly create pools
before running newfs, or do we need to auto-create pools when they run
newfs? Auto-creating some pools from newfs is a bit awkward
internally because it requires modifying both OSD and MDS maps in one
command.
Cheers,
John
1. http://tracker.ceph.com/issues/8010
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