<font size=2 face="sans-serif">Hi Bryan,</font><br><br><font size=2 face="sans-serif">Making sure Malahal's reply was received
by the user group.</font><br><br><font size=2 face="Arial">>> 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.<br> </font><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
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for priority messages to the Spectrum Scale (GPFS) team.</font><br><br><br><br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">Bryan Banister <bbanister@jumptrading.com></font><br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">gpfsug main discussion
list <gpfsug-discuss@spectrumscale.org></font><br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">03/23/2017 08:27 AM</font><br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">Re: [gpfsug-discuss]
CES node slow to respond</font><br><font size=1 color=#5f5f5f face="sans-serif">Sent by:
</font><font size=1 face="sans-serif">gpfsug-discuss-bounces@spectrumscale.org</font><br><hr noshade><br><br><br><tt><font size=2>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: gpfsug-discuss-bounces@spectrumscale.org [</font></tt><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org"><tt><font size=2>mailto:gpfsug-discuss-bounces@spectrumscale.org</font></tt></a><tt><font size=2>]
On Behalf Of Matt Weil<br>Sent: Thursday, March 23, 2017 10:24 AM<br>To: gpfsug-discuss@spectrumscale.org<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: gpfsug-discuss-bounces@spectrumscale.org [</font></tt><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org"><tt><font size=2>mailto:gpfsug-discuss-bounces@spectrumscale.org</font></tt></a><tt><font size=2>]
On Behalf Of Matt Weil<br>> Sent: Wednesday, March 22, 2017 11:43 AM<br>> To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><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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