topic Re: Large Files in Operating System - HP-UX

Large Files

A.G.M. Velthof — Fri, 15 Oct 2004 06:14:04 GMT

We have a rp2470 system, running hpux11.11.
The filesystems are for large files.
When running Ansys and the outputfile > 2GB the result is ok.
When starting Ansys with the at command the program crashes with "write error possible full disk".
Anyone any Idea?

Greetings, Alfons

Re: Large Files

RAC_1 — Fri, 15 Oct 2004 06:47:31 GMT

As the message says, is the FS full??
IS the required space available on FS??

Also at runs with a very minimal environment. May be ulimit is coming into picture. Ream the man page of proto. The file is /var/adm/cron/.proto. In this you can specify the ulimit file size limit. you may also want to execute the at with -f option and secify all ulimit options in that.

ulimit -f unlimited

Anil

Re: Large Files

Jean-Luc Oudart — Fri, 15 Oct 2004 07:03:20 GMT

Seems to me this has to do with ulimit
1) What value do you have for ulimit ?
with the at command ?

2) What shell do you use (POSIX or Korn) ?

Regards
Jean-Luc

Re: Large Files

Bill Hassell — Fri, 15 Oct 2004 07:05:47 GMT

The at command is just like cron--no login! So none of your 'normal' environment is present when the job runs. That means PATH is minimal and no special settings (variables) are present. The outputfile may not have a fullpath setup (never a good idea for cron or at). The complete environment for cron/at is:

HOME=user's-home-directory
LOGNAME=user's-login-id
PATH=/usr/bin:/usr/sbin:.
SHELL=/usr/bin/sh

Nothing else. You'll have to determine what Ansys requires then add these values to your Ansys script.

Re: Large Files

A.G.M. Velthof — Fri, 15 Oct 2004 07:06:27 GMT

There is plenty of space on the fs.
Without the at command it runs fine.
I have already found the .proto file and started the Ansys program.
I will let You know the result.

Greetings, Alfons

Re: Large Files

Franky_1 — Fri, 15 Oct 2004 07:20:22 GMT

Hi,

seems that the limitation lies in the at command itself
I've tried to reproduce the error and only when using the at command the procedure stops. Calling the program from the shell or starting it using cron works just fine
So i would give it a try using cron

Regards

Franky

Re: Large Files

Geoff Wild — Fri, 15 Oct 2004 08:17:18 GMT

May be a patch:

http://www2.itrc.hp.com/service/patch/patchDetail.do?BC=patch.breadcrumb.main|patch.breadcrumb.search|&patchid=PHCO_26562&context=hpux:800:11:11

( SR:8606179733 CR:JAGad48956 )
at/cron jobs are not able to create large files.

Rgds...Geoff

Re: Large Files

A.G.M. Velthof — Fri, 15 Oct 2004 09:06:27 GMT

The Ansys program works fine no with the at
command.

Thanks to all,

regards, Alfons

Re: Large Files

RAC_1 — Fri, 15 Oct 2004 09:43:01 GMT

A.G.M. Velthof,

Can you elaborate on how exactly you resolved it?? this could be helpful to other team members.

Anil

Re: Large Files

Tom Danzig — Fri, 15 Oct 2004 13:22:05 GMT

Actually, at jobs DO take on the environment of the shell that runs the at command. You can verify this by scheduling a command with at and then looking at the actual at job file stored in /var/spool/cron/atjobs/

You will see all of the shells enivironment defined in there.