[Gluster-users] Gluster vs NFS export sync

Franco Broi franco.broi at iongeo.com
Tue Jul 15 00:54:28 UTC 2014


I think the option I need is noac.

On Fri, 2014-07-11 at 16:10 +0530, Santosh Pradhan wrote: 
> On 07/11/2014 02:37 PM, Franco Broi wrote:
> > On Fri, 2014-07-11 at 14:22 +0530, Santosh Pradhan wrote:
> >> On 07/11/2014 06:10 AM, Franco Broi wrote:
> >>> Hi
> >>>
> >>> Is there any way to make Gluster emulate the behaviour of a NFS
> >>> filesystem exported with the sync option? By that I mean is it possible
> >>> to write a file from one client and guarantee that the data will be
> >>> instantly available on close to all other clients?
> >> I think FUSE also supports the sync option with mount similar to NFS.
> > There's 2 types of NFS sync, server and client but they behave very
> > differently. With sync at the client end, NFS just calls fsync on close
> > (I think),
> 
> No. If the NFS client is mounted with sync flag i.e. -o sync, then all 
> the WRITEs will be synchronous i.e. they wont be cached in client side 
> and they(WRITEs) will hit the server with FILE_SYNC (stable write) flag 
> which is nothing but FILE I/O with O_SYNC flag.
> 
> > with sync at the server end, all writes are synchronous.
> >
> > Opening the file with O_SYNC also doesn't give the desired effect
> > although you'd think it would.
> It should be same as above.
> 
> Thanks,
> Santosh
> >   NFS must have some way of communicating
> > the file attribute changes to all the clients immediately the write
> > completes.
> >
> >> Man page snippet for fuse(8):
> >> OPTIONS
> >>          Most of the generic mount options described in mount are
> >> supported (ro, rw, suid, nosuid, dev,
> >>          nodev, exec, noexec, atime, noatime, sync, async, dirsync).
> >> Filesystems are mounted  with
> >>          nodev,nosuid by default, which can only be overridden by a
> >> privileged user.
> >>
> >> Thanks,
> >> Santosh
> >>
> >>> Cheers,
> >>>
> >>> _______________________________________________
> >>> Gluster-users mailing list
> >>> Gluster-users at gluster.org
> >>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
> >
> 





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