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<p>Just reporting back that the issue we had seems to have been solved. In our case it was fixed by applying hotfix-packages from IBM. Did this in December and I can no longer trigger the issue. Hopefully, it'll stay fixed when we get full production load on
the system again now in January.</p>
<p>Also, as far as I can see, it looks like Scale 5.0.2.2 includes these packages already.<br>
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<p>Regards,</p>
<p>Andreas mattsson<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>Från:</b> gpfsug-discuss-bounces@spectrumscale.org <gpfsug-discuss-bounces@spectrumscale.org> för Ulrich Sibiller <u.sibiller@science-computing.de><br>
<b>Skickat:</b> den 13 december 2018 14:52:42<br>
<b>Till:</b> gpfsug-discuss@spectrumscale.org<br>
<b>Ämne:</b> Re: [gpfsug-discuss] Filesystem access issues via CES NFS</font>
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<div class="PlainText">On 23.11.2018 14:41, Andreas Mattsson wrote:<br>
> Yes, this is repeating.<br>
> <br>
> We’ve ascertained that it has nothing to do at all with file operations on the GPFS side.<br>
> <br>
> Randomly throughout the filesystem mounted via NFS, ls or file access will give<br>
> <br>
> ”<br>
> <br>
> > ls: reading directory /gpfs/filessystem/test/testdir: Invalid argument<br>
> <br>
> “<br>
> <br>
> Trying again later might work on that folder, but might fail somewhere else.<br>
> <br>
> We have tried exporting the same filesystem via a standard kernel NFS instead of the CES
<br>
> Ganesha-NFS, and then the problem doesn’t exist.<br>
> <br>
> So it is definitely related to the Ganesha NFS server, or its interaction with the file system.<br>
> > Will see if I can get a tcpdump of the issue.<br>
<br>
We see this, too. We cannot trigger it. Fortunately I have managed to capture some logs with
<br>
debugging enabled. I have now dug into the ganesha 2.5.3 code and I think the netgroup caching is
<br>
the culprit.<br>
<br>
Here some FULL_DEBUG output:<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250]
<br>
export_check_access :EXPORT :M_DBG :Check for address 1.2.3.4 for export id 1 path /gpfsexport<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250] client_match
<br>
:EXPORT :M_DBG :Match V4: 0xcf7fe0 NETGROUP_CLIENT: netgroup1 (options=421021e2root_squash , RWrw,
<br>
3--, ---, TCP, ----, Manage_Gids , -- Deleg, anon_uid= -2, anon_gid= -2, sys)<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250] nfs_ip_name_get
<br>
:DISP :F_DBG :Cache get hit for 1.2.3.4->client1.domain<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250] client_match
<br>
:EXPORT :M_DBG :Match V4: 0xcfe320 NETGROUP_CLIENT: netgroup2 (options=421021e2root_squash , RWrw,
<br>
3--, ---, TCP, ----, Manage_Gids , -- Deleg, anon_uid= -2, anon_gid= -2, sys)<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250] nfs_ip_name_get
<br>
:DISP :F_DBG :Cache get hit for 1.2.3.4->client1.domain<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250] client_match
<br>
:EXPORT :M_DBG :Match V4: 0xcfe380 NETGROUP_CLIENT: netgroup3 (options=421021e2root_squash , RWrw,
<br>
3--, ---, TCP, ----, Manage_Gids , -- Deleg, anon_uid= -2, anon_gid= -2, sys)<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250] nfs_ip_name_get
<br>
:DISP :F_DBG :Cache get hit for 1.2.3.4->client1.domain<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250]
<br>
export_check_access :EXPORT :M_DBG :EXPORT (options=03303002 , , ,
<br>
, , -- Deleg, , )<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250]
<br>
export_check_access :EXPORT :M_DBG :EXPORT_DEFAULTS (options=42102002root_squash , ----, 3--, ---,
<br>
TCP, ----, Manage_Gids , , anon_uid= -2, anon_gid= -2, sys)<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250]
<br>
export_check_access :EXPORT :M_DBG :default options (options=03303002root_squash , ----, 34-, UDP,
<br>
TCP, ----, No Manage_Gids, -- Deleg, anon_uid= -2, anon_gid= -2, none, sys)<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250]
<br>
export_check_access :EXPORT :M_DBG :Final options (options=42102002root_squash , ----, 3--, ---,
<br>
TCP, ----, Manage_Gids , -- Deleg, anon_uid= -2, anon_gid= -2, sys)<br>
2018-12-13 11:53:41 : epoch 0009008d : server1 : gpfs.ganesha.nfsd-258762[work-250] nfs_rpc_execute
<br>
:DISP :INFO :DISP: INFO: Client ::ffff:1.2.3.4 is not allowed to access Export_Id 1 /gpfsexport,
<br>
vers=3, proc=18<br>
<br>
The client "client1" is definitely a member of the "netgroup1". But the NETGROUP_CLIENT lookups for
<br>
"netgroup2" and "netgroup3" can only happen if the netgroup caching code reports that "client1" is
<br>
NOT a member of "netgroup1".<br>
<br>
I have also opened a support case at IBM for this.<br>
<br>
@Malahal: Looks like you have written the netgroup caching code, feel free to ask for further
<br>
details if required.<br>
<br>
Kind regards,<br>
<br>
Ulrich Sibiller<br>
<br>
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