[gpfsug-discuss] CES node slow to respond

Bryan Banister bbanister at jumptrading.com
Thu Mar 23 15:26:57 GMT 2017


Anybody from IBM willing/able to give us some explanation of why ganesha is holding open so many files?  Is this expected/needed/etc?

Or do we have to open a PMR to get some kind of explanation?
-B

-----Original Message-----
From: gpfsug-discuss-bounces at spectrumscale.org [mailto:gpfsug-discuss-bounces at spectrumscale.org] On Behalf Of Matt Weil
Sent: Thursday, March 23, 2017 10:24 AM
To: gpfsug-discuss at spectrumscale.org
Subject: Re: [gpfsug-discuss] CES node slow to respond

FYI all

We also ran into this after bumping maxFilesToCache.

Mar 22 13:02:37 ces1 ntpd[1191]: ./../lib/isc/unix/ifiter_ioctl.c:348:
unexpected error:
Mar 22 13:02:37 ces1 ntpd[1191]: making interface scan socket: Too many
open files in system

fix

sysctl -w fs.file-max=1000000


On 3/22/17 12:01 PM, Bryan Banister wrote:
> 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.
>
> 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.
> -Bryan
>
> -----Original Message-----
> From: gpfsug-discuss-bounces at spectrumscale.org [mailto:gpfsug-discuss-bounces at spectrumscale.org] On Behalf Of Matt Weil
> Sent: Wednesday, March 22, 2017 11:43 AM
> To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
> Subject: [gpfsug-discuss] CES node slow to respond
>
> All,
>
> We had an indecent yesterday where one of our CES nodes slowed to a
> crawl.  GPFS waiters showed pre fetch threads going after inodes.
> iohist also showed lots of inode fetching.  Then we noticed that the CES
> host had 5.4 million files open.
>
> The change I made was to set maxStatCache=DEFAULT because it is linux.
> And set maxFilesToCache=10000000 it was set to 500000.  Then restarted GPFS.
>
> Is there something else we should change as well.
>
> Thanks
>
> Matt
>
>
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