Re: [ceph-fuse] Quota size change does not notify another ceph-fuse client.

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On Wed, Mar 15, 2017 at 1:53 AM, yu2xiangyang <yu2xiangyang@xxxxxxx> wrote:
> Dear cephers,
>
> I met a problem when using ceph-fuse with quota enabled.
>
>  My ceph version is :
>
>  ceph version 10.2.5 (c461ee19ecbc0c5c330aca20f7392c9a00730367) .
>
> I have two ceph-fuse process in two different hosts(node1 and node2).
>
>  One ceph-fuse is mounted with root directory on /mnt/cephfs on node1.
>  [root@node1] ceph-fuse -m mds-host:6789 /mnt/cephfs
>
>  I set quota on a sub directory volumes/nas0 in /mnt/cephfs.
>  [root@node1] setfattr -n ceph.quota.max_bytes -v 100000000000
> /mnt/cephfs/volumes/nas0
>
> One ceph-fuse is mounted with /volumes/nas0 on node2 with client quota
> enabled.
> [root@node2] ceph-fuse --id yxy -r /volumes/nas0 /shares/share0/
>
>  [root@node2]$ cat /etc/ceph/ceph.client.yxy.keyring
>  [client.yxy] key = AQBmtMdYNPnOJRAAg5t+gkUDmqTpQhZh2VXlWg==
>  caps mds = "allow * path=/volumes/nas0"
> caps mon = "allow *"
> caps osd = "allow *"
>
> [root@node2 ]$ cat /etc/ceph/ceph.conf
> [global] mon_initial_members=xxxxx
> mon_host = xxxxx
> client quota = true
>
>  DF commond show that ceph-fuse has 94GB capacity just equal to the size we
> set.
>
> ceph-fuse 94G 4G 90G 3% /shares/share0
>
> But when I resize the quota with /volumes/nas0. in node1.
> [root@node1 ~]# setfattr -n ceph.quota.max_bytes -v 70000000000
> /mnt/cephfs/volumes/nas0
>
> On node2 , DF command stilll show 94GB capacity.
> ceph-fuse 94G 4G 90G 3% /shares/share0
>
> One host resizes the quota size and another host does not know the change.
>
>  Is it a problem with ceph-fuse? Appreciate any reply.

There's a known issue that quota updates aren't visible on another
client until it does some IO in the directory:
http://tracker.ceph.com/issues/17939

This probably have the same underlying cause as the statfs (df) data
looking out of date.

I'm looking into it, see ticket for updates.

John


>
> cheers,
> penglaixy
>
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> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
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