On 22/03/2015 08:29, Bogdan SOLGA wrote:
Hello, everyone!
I have a few questions related to the CephFS part of Ceph:
* is it production ready?
Like it says at http://ceph.com/docs/master/cephfs/: " CephFS currently
lacks a robust ‘fsck’ check and repair function. Please use caution when
storing important data as the disaster recovery tools are still under
development". That page was recently updated.
* can multiple CephFS be created on the same cluster? The CephFS
creation <http://docs.ceph.com/docs/master/cephfs/createfs/> page
describes how to create a CephFS using (at least) two pools, but
the mounting <http://docs.ceph.com/docs/master/cephfs/kernel/>
page does not refer to any pool, when mounting the FS;
Currently you can only have one filesystem per Ceph cluster.
* besides the pool quota
<http://docs.ceph.com/docs/master/rados/operations/pools/#set-pool-quotas>
setting, are there any means by which a CephFS can have a quota
defined? I have found this
<https://wiki.ceph.com/Planning/Blueprints/Firefly/Cephfs_quota_support>
document, which is from the Firefly release (and it seems only a
draft), but no other references on the matter.
Yes, when using the fuse client there is a per-directory quota system
available, although it is not guaranteed to be completely strict. I
don't think there is any documentation for that, but you can see how to
use it here:
https://github.com/ceph/ceph/blob/master/qa/workunits/fs/quota/quota.sh
* this <http://docs.ceph.com/docs/master/man/8/mount.ceph/> page
refers to 'mounting only a part of the namespace' -- what is the
namespace referred in the page?
In this context namespace means the filesystem tree. So "part of the
namespace" means a subdirectory.
* can a CephFS be mounted simultaneously from multiple clients?
Yes.
* what would be the recommended way of creating system users on a
CephFS, if a quota is needed for each user? create a pool for each
user? or?
No recommendation at this stage - it would be interesting for you to try
some things and let us know how you get on.
Cheers,
John
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
