[daip] RH Linux inconsistencies in treatment of aips files >2 GB in size

[Patrick P. Murphy]

(Interjecting; I'm not officially an AIP anymore, but I do have experience
with large files under recent versions of Linux).

On Mon, 22 Oct 2001 11:31:01 -0400 (EDT), Lincoln Greenhill
   <lincoln at play.harvard.edu> said: 

> I am working with 8+ GB AIPS image cubes on a PC w/ RedHat's distribution
> of the 2.4.2-2 kernel.  31DEC01 AIPS works smoothly for these files
> (e.g., IMAGR, TRANS).

> However, I notice that LINUX operations related to "ls" are erratic.  I
> wonder if you have witnessed this behavior?  Anotated examples follow.

I can't easily reproduce this, and I'm a bit hesitant to say "send me that
multi-gigabyte file" :)  

We're currently using kernel 2.4.3-12, Red Hat 7.1 on some of our systems
(to be upgraded to 7.2 soon, now that it's formally released).  These
systems have /bin/ls from fileutils-4.0.36-4, and I can at least
predictably and repeatedly do some of the operations on large files you
had problems with:

  : sarah_pmurphy; ls -l DISK2.80*
  -rw-rw-r--    1 kkellerm aipsuser   429120 Oct  2 13:32 DISK2.80
  -rw-rw-r--    1 kkellerm aipsuser  1725120 Oct  2 14:04 DISK2.800
  -rw-rw-r--    1 kkellerm aipsuser  1941120 Oct  2 14:04 DISK2.801
  -rw-rw-r--    1 kkellerm aipsuser  7747200 Oct  2 14:04 DISK2.802
  -rw-rw-r--    1 kkellerm aipsuser 3217176000 Oct  2 15:15 DISK2.803
  -rw-rw-r--    1 kkellerm aipsuser  1725120 Oct  2 15:23 DISK2.804
  -rw-rw-r--    1 kkellerm aipsuser  2142720 Oct  2 15:23 DISK2.805
  -rw-rw-r--    1 kkellerm aipsuser  2073600 Oct  2 15:23 DISK2.806
  -rw-rw-r--    1 kkellerm aipsuser  2831040 Oct  2 15:23 DISK2.807
  -rw-rw-r--    1 kkellerm aipsuser  2784960 Oct  2 15:23 DISK2.808
  -rw-rw-r--    1 kkellerm aipsuser  2880000 Oct  2 15:23 DISK2.809
  : sarah_pmurphy; ls -l DISK2.803
  -rw-rw-r--    1 kkellerm aipsuser 3217176000 Oct  2 15:15 DISK2.803
  : sarah_pmurphy; 

These aren't AIPS files, granted, but one of them clearly is over the 2G
limit.  In fact there were four:

  : sarah_pmurphy; ls -ls DISK3.91 DISK2.{829,942,803}
  3144852 -rw-rw-r--    1 kkellerm aipsuser 3217176000 Oct  2 15:15 DISK2.803
  2968820 -rw-rw-r--    1 kkellerm aipsuser 3037095360 Oct  2 16:29 DISK2.829
  3118196 -rw-rw-r--    1 kkellerm aipsuser 3189911040 Oct  2 17:40 DISK2.942
  2540760 -rw-rw-r--    1 kkellerm aipsuser 2599191360 Oct  3 10:26 DISK3.91
  : sarah_pmurphy; 

I'll bet that an upgrade to RH7.1 or 7.2 would cure your problem.

				- Pat