[Gluster-users] NFS file locking with gluster 3.7.3

[Thibault Godouet]

Looking around I get the impression that file locking (NLM) may simply not
be supported in glusterfs's built-in NFS server.

I get the impression that Ganesha is aimed at supporting NFS better, and
presumably supports locking well, so I should give it a try (If I
understand well the performance is also likely to be higher, which is a
nice bonus!)

If someone could confirm this that would be useful to make sure I'm going
in the right direction.

Thanks,
Thibault.
On 4 Aug 2015 1:23 pm, "Thibault Godouet" <tibo92 at godouet.net> wrote:

> Hi,
>
>
>
> I have a cluster of 2 servers running 3.7.3 with replication, and standard
> NFS (no ganesha).  This in on CentOS 6.
>
> I use CTDB with 2 virtual IPs (one for each server in a normal
> situation) to share the volume over NFS and CIFS (samba).
>
>
>
> fnctl() file locking doesn't seem to work when the volume is mounted over
> NFS.
>
> This is apparent with a 'svn info' (svn 1.8 if it made any difference) in
> a local working copy:
>
>
>
> $ svn info
> svn: E200033: Another process is blocking the working copy database, or
> the underlying filesystem does not support file locking; if the working
> copy is on a network filesystem, make sure file locking has been enabled on
> the file server
> svn: E200033: sqlite[S5]: database is locked, executing statement 'PRAGMA
> synchronous=OFF;PRAGMA recursive_triggers=ON;PRAGMA foreign_keys=OFF;PRAGMA
> locking_mode = NORMAL;'
>
>
>
> a strace shows:
>
>
>
> $ svn info
> svn: E200033: Another process is blocking the working copy database, or
> the underlying filesystem does not support file locking; if the working
> copy is on a network filesystem, make sure file locking has been enabled on
> the file server
> svn: E200033: sqlite[S5]: database is locked, executing statement 'PRAGMA
> synchronous=OFF;PRAGMA recursive_triggers=ON;PRAGMA foreign_keys=OFF;PRAGMA
> locking_mode = NORMAL;'
>
>
>
> Everything seems to work fine on native Gluster (FUSE) mounts: the same
> 'svn info' works nicely.
>
> I can't really use native mounts due to the performance hit (many small
> files) and the fact I would need to install the gluster client software on
> every server.
>
>
>
> Is fnctl() file locking supported in Gluster NFS mounts?  If so, any idea
> why it doesn't work for me?
>
>
>
> Thanks,
>
> Thibault.
>
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