Problem with nfs data caching?

Problem with nfs data caching?

[Terry Bates]

We are experiencing a problem which seems to be related to data caching
on our linux nfs clients;

Using Mental Ray, we render picture to an NFS mounted filesystem (I have
tried both SGI and Auspex file servers).  We have an inhouse application
which we use to view the rendered pictures.  If you attempt to view a
picture which has not completely finished rendering, you get a plain
grey window.  Once that situation has happened, you cannot view that
picture from that machine until you umount and mount that filesystem
again.  You can view it from other machines however.

Most of our machines are running RedHat 7.2 with a 2.4.7-10 kernel and
nfs-utils-0.3.1-13.

I have tried using RedHat 8.0 with a 2.4.18-14, 2.4.20-28, and most
recently 2.6.2 kernel, and nfs-utils-1.0.1-2.  Same result.  Here the
line from the /etc/fstab file for the filesystem that I'm testing on:

holly:/images_temp              /images_temp            nfs
rw,bg,rsize=32768,wsize=32768

I don't have this problem with any of our Irix clients.

Terry











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Re: Problem with nfs data caching?

[Steve Wampler]

On Wed, 2004-02-25 at 14:37, Terry Bates wrote:
> We are experiencing a problem which seems to be related to data caching
> on our linux nfs clients;
> 
> Using Mental Ray, we render picture to an NFS mounted filesystem (I have
> tried both SGI and Auspex file servers).  We have an inhouse application
> which we use to view the rendered pictures.  If you attempt to view a
> picture which has not completely finished rendering, you get a plain
> grey window.  Once that situation has happened, you cannot view that
> picture from that machine until you umount and mount that filesystem
> again.  You can view it from other machines however.
> 
> Most of our machines are running RedHat 7.2 with a 2.4.7-10 kernel and
> nfs-utils-0.3.1-13.

I wonder if this is the same problem we see?  What does 'dmesg'
on that client show when this happens.  If it reports:

   NFS: Buggy server - nlink == 0!
   __nfs_fhget: iget failed

(or something similar), then it's probably the same problem.
If so, I haven't seen a solution posted yet...

-- 
Steve Wampler -- swampler@noao.edu
The gods that smiled on your birth are now laughing out loud.


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Re: Problem with nfs data caching?

[trond.myklebust]

På on , 25/02/2004 klokka 13:37, skreiv Terry Bates:
> We are experiencing a problem which seems to be related to data caching
on our linux nfs clients;
>
> Using Mental Ray, we render picture to an NFS mounted filesystem (I have
tried both SGI and Auspex file servers).  We have an inhouse application
which we use to view the rendered pictures.  If you attempt to view a
picture which has not completely finished rendering, you get a plain
grey window.  Once that situation has happened, you cannot view that
picture from that machine until you umount and mount that filesystem
again.  You can view it from other machines however.

See the thread on the mailing list yesterday concerning shared mmap() and
the limitations of the Linux VM...

Cheers,
  Trond





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