[gpfsug-discuss] -o syncnfs has no effect?

[IBM Spectrum Scale]

Hi,

mmchfs Device -o syncnfs    is the correct way of setting the syncnfs so
that it applies to the file system both on the home and the remote cluster
On 4.2.3+  syncnfs is the default option on Linux . Which means GPFS will
implement the syncnfs behavior regardless of what the mount command says
The documentation indicates that mmmount Device -o syncnfs=yes   appears to
be the correct syntax.  When I tried that, I do see 'syncnfs=yes' in the
output of the 'mount' command
To change the remote mount option so that you don't have to specify the
option on the command line every time you do mmmount, instead of using
mmchfs, one should use mmremotefs update -o.

Regards, The Spectrum Scale (GPFS) team

------------------------------------------------------------------------------------------------------------------

If you feel that your question can benefit other users of  Spectrum Scale
(GPFS), then please post it to the public IBM developerWroks Forum at
https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479.


If your query concerns a potential software error in Spectrum Scale (GPFS)
and you have an IBM software maintenance contract please contact
1-800-237-5511 in the United States or your local IBM Service Center in
other countries.

The forum is informally monitored as time permits and should not be used
for priority messages to the Spectrum Scale (GPFS) team.



From:	"Billich Heinrich Rainer (PSI)" <heiner.billich at psi.ch>
To:	gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:	07/06/2018 12:06 AM
Subject:	[gpfsug-discuss] -o syncnfs has no effect?
Sent by:	gpfsug-discuss-bounces at spectrumscale.org



Hello,

I try to mount a fs with "-o syncnfs" as we'll export it with
CES/Protocols. But I never see the mount option displayed when I do

 # mount | grep fs-name

This is a remote cluster mount, we'll run the Protocol nodes in  a separate
cluster. On the home cluster I see the option 'nfssync' in the output of
'mount'.

My conclusion is that the mount option "syncnfs" has no effect on remote
cluster mounts. Which seems a bit strange?

Please can someone clarify on this? What is the impact on protocol nodes
exporting remote cluster mounts? Is there any chance of data corruption? Or
are some mount options implicitely inherited from the home cluster? I've
read 'syncnfs' is default on Linux, but I would like to know for sure.

Funny enough I can pass arbitrary options with

  # mmmount <fs-name> -o some-garbage

which are silently ignored.

 I did 'mmchfs -o syncnfs' on the home cluster and the syncnfs option is
present in /etc/fstab on the remote cluster. I did not remount on all nodes
__

Thank you, I'll appreciate any hints or replies.

Heiner

Versions:
Remote cluster 5.0.1 on RHEL7.4  (imounts the fs and runs protocol nodes)
Home cluster 4.2.3-8 on RHEL6  (export the fs, owns the storage)
Filesystem: 17.00 (4.2.3.0)
All Linux x86_64 with Spectrum Scale Standard Edition
--
Paul Scherrer Institut
Science IT
Heiner Billich
WHGA 106
CH 5232  Villigen PSI
056 310 36 02
https://www.psi.ch



_______________________________________________
gpfsug-discuss mailing list
gpfsug-discuss at spectrumscale.org
http://gpfsug.org/mailman/listinfo/gpfsug-discuss




-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20180723/97ed0101/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: graycol.gif
Type: image/gif
Size: 105 bytes
Desc: not available
URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20180723/97ed0101/attachment-0002.gif>