Re: OSDs don't actually delete files when two CephFS (or more) are in use

[Sam Lang <sam.lang@inktank.com>]

On 12/10/2012 08:29 AM, Geoffrey Hartz wrote:
> Hi!
>
> I'm new to Ceph and I have a strange behavior with CephFS
>
> Config is :
>
> Ubuntu 12.04
> Kernel 3.6.9
> Ceph V0.55
>
> 2 OSD, 1 mon, 1 MDS, all on same host
> 2 clients, separate Hosts
>
> Ceph.conf:
>
> http://paste.ubuntu.com/1423712/
>
> To mount the share I use : sudo ceph-fuse -m 192.168.80.139:6789 /mnt
>
> When I create a file on one client, the other see the file, can be
> downloaded etc.
>
> But when I delete the file, both clients don't see the file anymore
> BUT the file is still there on OSD (using space disk).

Removing a file removes the directory entry (as you've seen), but the 
inode itself doesn't get removed until all references to it are dropped. 
  The clients may cache the capability for those inodes for a period of 
time, so you're not seeing the references drop until they get evicted 
from the cache.  Unmounting ensures that they get evicted from the 
client caches, so all references go to zero.

Also, removal of the underlying objects is done lazily, so you may not 
see the space get freed up right away.

-sam

>
> When I umount from BOTH clients, OSD are update and file is actually
> delete (same behavior with mount -t ceph)
>
> I'm missing something?
>
> Thanks!
>
> --
> Geoffrey HARTZ
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