<font size=2 face="sans-serif">Caching of file descriptors can be disabled
with </font><font size=2 face="Arial">"Cache_FDs = FALSE;"</font><font size=2 face="sans-serif">in cacheinode{} block.</font><br><br><font size=2 face="sans-serif">Regards, The Spectrum Scale (GPFS) team<br><br>------------------------------------------------------------------------------------------------------------------<br>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 </font><a href="https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479"><font size=2 face="sans-serif">https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479</font></a><font size=2 face="sans-serif">.
<br><br>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.
<br><br>The forum is informally monitored as time permits and should not be used
for priority messages to the Spectrum Scale (GPFS) team.</font><br><br><font size=2 color=#5f5f5f face="Arial">>></font><br><font size=2 color=#5f5f5f face="Arial"><br>From: </font><font size=2 face="Arial">Bryan Banister <bbanister@jumptrading.com></font><font size=2 color=#5f5f5f face="Arial"><br>To: </font><font size=2 face="Arial">IBM Spectrum Scale/Poughkeepsie/IBM@IBMUS,
gpfsug main discussion list <gpfsug-discuss@spectrumscale.org></font><font size=2 color=#5f5f5f face="Arial"><br>Date: </font><font size=2 face="Arial">03/24/2017 11:13 AM</font><font size=2 color=#5f5f5f face="Arial"><br>Subject: </font><font size=2 face="Arial">RE: CES node slow to respond</font><font size=2 face="Arial"></font><hr><font size=2 face="Arial"><br><br></font><font size=3 color=#004080 face="Calibri"><br>Hi Vipul,<br> <br>Hmm… interesting. We have dedicated systems running CES and nothing
else, so the only thing opening files on GPFS is ganesha. IBM
Support recommended we massively increase the maxFilesToCache to fix the
performance issues we were having. I could try to reproduce the problem
to investigate further, but the impact to users would not be appreciated.
<br> <br>Setting such a high value for maxFilesToCache has direct impact on the
token manager so fixing this would be very good.<br> <br>Perhaps IBM could take a closer look at this without our involvement?<br>-Bryan<b><br> </b></font><font size=3 face="Calibri"><b><br>From:</b> Vipul Paul [</font><a href=mailto:vpaul@us.ibm.com target=_blank><font size=3 color=blue face="Calibri"><u>mailto:vpaul@us.ibm.com</u></font></a><font size=3 face="Calibri">]
<b>On Behalf Of </b>IBM Spectrum Scale<b><br>Sent:</b> Friday, March 24, 2017 12:18 PM<b><br>To:</b> gpfsug main discussion list <gpfsug-discuss@spectrumscale.org>;
Bryan Banister <bbanister@jumptrading.com><b><br>Subject:</b> Re: CES node slow to respond</font><font size=3 face="Times New Roman"><br> </font><font size=2 face="Arial"><br>Hi Bryan,</font><font size=2 face="Arial"><br></font><font size=2 face="Arial"><br>Making sure Malahal's reply was received by the user group.</font><font size=2 face="Arial"><br></font><font size=2 face="Arial"><br>>> Then we noticed that the CES host had 5.4 million files open<br><br>This is technically not possible with ganesha alone. A process can only
open 1 million files on RHEL distro. Either we have leaks in kernel or
some other processes contributing to this.<br><br>Ganesha does keep NFSv3 files open and keep open for performance. It doesn't
have a good logic to close them after some inactivity. It does close them
if the number is close to max open files which is configurable.<br><br>PS: kNFS does open, read/write, and then close. No caching in older
versions. They did have a feature in a recent code to cache open files
in NFSv3 as well.</font><font size=2 face="Arial"><br></font><font size=2 face="Arial"><br>Regards, The Spectrum Scale (GPFS) team<br><br>------------------------------------------------------------------------------------------------------------------<br>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 </font><a href="https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479" target=_blank><font size=2 color=blue face="Arial"><u>https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479</u></font></a><font size=2 face="Arial">.<br><br>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.<br><br>The forum is informally monitored as time permits and should not be used
for priority messages to the Spectrum Scale (GPFS) team.</font><font size=2 face="Arial"><br><br><br></font><font size=1 color=#5f5f5f face="Arial"><br>From: </font><font size=1 face="Arial">Bryan
Banister <</font><a href=mailto:bbanister@jumptrading.com target=_blank><font size=1 color=blue face="Arial"><u>bbanister@jumptrading.com</u></font></a><font size=1 face="Arial">></font><font size=1 color=#5f5f5f face="Arial"><br>To: </font><font size=1 face="Arial">gpfsug
main discussion list <</font><a href="mailto:gpfsug-discuss@spectrumscale.org" target=_blank><font size=1 color=blue face="Arial"><u>gpfsug-discuss@spectrumscale.org</u></font></a><font size=1 face="Arial">></font><font size=1 color=#5f5f5f face="Arial"><br>Date: </font><font size=1 face="Arial">03/23/2017
08:27 AM</font><font size=1 color=#5f5f5f face="Arial"><br>Subject: </font><font size=1 face="Arial">Re:
[gpfsug-discuss] CES node slow to respond</font><font size=1 color=#5f5f5f face="Arial"><br>Sent by: </font><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target=_blank><font size=1 color=blue face="Arial"><u>gpfsug-discuss-bounces@spectrumscale.org</u></font></a><font size=2 face="Arial"></font><div align=center><hr noshade></div><br><font size=2 face="Arial"><br><br></font><font size=2 face="Courier New"><br>Anybody from IBM willing/able to give us some explanation of why ganesha
is holding open so many files? Is this expected/needed/etc?<br><br>Or do we have to open a PMR to get some kind of explanation?<br>-B<br><br>-----Original Message-----<br>From: </font><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target=_blank><font size=2 color=blue face="Courier New"><u>gpfsug-discuss-bounces@spectrumscale.org</u></font></a><font size=2 face="Courier New">[</font><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target=_blank><font size=2 color=blue face="Courier New"><u>mailto:gpfsug-discuss-bounces@spectrumscale.org</u></font></a><font size=2 face="Courier New">]
On Behalf Of Matt Weil<br>Sent: Thursday, March 23, 2017 10:24 AM<br>To: </font><a href="mailto:gpfsug-discuss@spectrumscale.org" target=_blank><font size=2 color=blue face="Courier New"><u>gpfsug-discuss@spectrumscale.org</u></font></a><font size=2 face="Courier New"><br>Subject: Re: [gpfsug-discuss] CES node slow to respond<br><br>FYI all<br><br>We also ran into this after bumping maxFilesToCache.<br><br>Mar 22 13:02:37 ces1 ntpd[1191]: ./../lib/isc/unix/ifiter_ioctl.c:348:<br>unexpected error:<br>Mar 22 13:02:37 ces1 ntpd[1191]: making interface scan socket: Too many<br>open files in system<br><br>fix<br><br>sysctl -w fs.file-max=1000000<br><br><br>On 3/22/17 12:01 PM, Bryan Banister wrote:<br>> We had a similar issue and also were instructed by IBM Support to
increase the maxFilesToCache to an insane value... Basically when the file
cache gets full then the host will spend all of its cycles looking for
a file to evict every time a new file is opened... baaaah.<br>><br>> Not sure why Ganesha has to keep so many files open... I can't believe
our NFS clients actually keep that many open. cNFS never needed this.<br>> -Bryan<br>><br>> -----Original Message-----<br>> From: </font><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target=_blank><font size=2 color=blue face="Courier New"><u>gpfsug-discuss-bounces@spectrumscale.org</u></font></a><font size=2 face="Courier New">[</font><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" target=_blank><font size=2 color=blue face="Courier New"><u>mailto:gpfsug-discuss-bounces@spectrumscale.org</u></font></a><font size=2 face="Courier New">]
On Behalf Of Matt Weil<br>> Sent: Wednesday, March 22, 2017 11:43 AM<br>> To: gpfsug main discussion list <</font><a href="mailto:gpfsug-discuss@spectrumscale.org" target=_blank><font size=2 color=blue face="Courier New"><u>gpfsug-discuss@spectrumscale.org</u></font></a><font size=2 face="Courier New">><br>> Subject: [gpfsug-discuss] CES node slow to respond<br>><br>> All,<br>><br>> We had an indecent yesterday where one of our CES nodes slowed to
a<br>> crawl. GPFS waiters showed pre fetch threads going after inodes.<br>> iohist also showed lots of inode fetching. Then we noticed that
the CES<br>> host had 5.4 million files open.<br>><br>> The change I made was to set maxStatCache=DEFAULT because it is linux.<br>> And set maxFilesToCache=10000000 it was set to 500000. Then
restarted GPFS.<br>><br>> Is there something else we should change as well.<br>><br>> Thanks<br>><br>> Matt<br>><br>><br>> ________________________________<br>> The materials in this message are private and may contain Protected
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