Hello,
I think that async is definetely the way to go. We have to tweak the
NFS server to accomodate 180 (diskless) clients and async as giving o
much better performance.
Maybe we should mention it in the doc but if it is the default behavior
then it is not even necessary.
Ben
* Jeremy Enos <[EMAIL PROTECTED]> [03-07-03 13:17]:
> I move that we continue with the old default (async). Since our
> application of NFS is very likely serving to different nodes
> reading/writing from the same file during an MPI job, this seems like the
> correct choice for us.
>
> Jeremy
>
> At 11:13 AM 7/3/2003 -0500, Jason B. wrote:
> >Here's the full information (if anyone cares):
> >
> > async This option allows the NFS server to
> >violate the NFS protocol
> > and reply to requests before any changes made by that
> >request
> > have been committed to stable storage (e.g. disc drive).
> >
> > Using this option usually improves performance, but at
> >the cost
> > that an unclean server restart (i.e. a crash) can cause
> >data to
> > be lost or corrupted.
> >
> > In releases of nfs�utils upto and including
> >1.0.0, this option
> > was the default. In this and future releases, sync
> >is the
> > default, and async must be
> >explicit requested if needed. To
> > help make system adminstrators aware of this change,
> >�exportfs�
> > will issue a warning if neither sync nor async is specified.
> >
> >Should we stick with 'async', or be safe and use 'sync'?
> >
> >
> >
> >At 01:32 AM 7/3/2003 -0500, Brian Elliott Finley wrote:
> >>This could have a performance impact. If I remember right, previous
> >>implementations assumed async, which tends to give better performance,
> >>but is not as conservative.
> >>
> >>We should probably choose one and explicitly state it in the config file.
> >>
> >>See "man exports" for details.
> >>
> >>-Brian
> >>
> >>
> >>Thus spake Jason B. ([EMAIL PROTECTED]):
> >>> Should we do anything about the following warnings (seen after
> >>installing
> >>> server packages).
> >>>
> >>> exportfs: No 'sync' or 'async' option specified for export
> >>> "10.0.0.0/24:/home".
> >>> Assuming default behaviour ('sync').
> >>> NOTE: this default has changed from previous versions
> >>> exportfs: No 'sync' or 'async' option specified for export
> >>> "10.0.0.89/255.255.255.0:/home".
> >>> Assuming default behaviour ('sync').
> >>> NOTE: this default has changed from previous versions
> >>>
> >>> Jason
> >>>
> >>>
> >>>
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Benoit des Ligneris Ph. D. <|> http://benoit.des.ligneris.net/
Centre de Calcul Scientifique <|> http://ccs.USherbrooke.ca/
Mydynaweb Developpe(u)r <|> http://mydynaweb.net/
OSCAR Developpe(u)r <|> http://oscar.sourceforge.net/
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