What is this mega-dvd-test?

[Stephen John Smoogen]

On Sun, Oct 31, 2010 at 16:33, Robert G. (Doc) Savage
<dsavage at peaknet.net> wrote:

> Bruno,
>
> I think I found at least part of the problem here. The Downloads
> directory in my home folder is bind mounted to an NFS filesystem on an
> RHEL5 server. For some reason the iso file is being severely truncated
> by that NFS filesystem:
>
> Here's the original file in a 1.1TB ext3 filesystem:
>
>        Red Hat Enterprise Linux Server release 5.5 (Tikanga)
>        Sunday - October 31, 2010  17:16:56 CDT
>        [doc at lion] /pub/fedora/linux/releases/14/Live
>        $ ls -l
>        total 5463812
>        -rw------- 1 doc doc        950 Oct 21 09:17 Fedora-14-Live-multi-CHECKSUM
>        -rw------- 1 doc doc 5589458944 Oct 21 10:06 Fedora-14-Live-multi.iso
>        drwxrwxr-x 2 doc doc       4096 Oct 26 20:02 i386
>        drwxrwxr-x 2 doc doc       4096 Oct 26 20:02 x86_64
>
> Here's the NFS-exported version as seen on the F13 system, the one
> running l-i-t-d:
>
>        Fedora release 13 (Goddard)
>        Sunday - October 31, 2010  16:55:17 CDT
>        [doc at tiger] /net/lion/pub/fedora/linux/releases/14/Live
>        $ ls -l
>        total 5463812
>        -rw------- 1 doc doc        950 Oct 21 09:17 Fedora-14-Live-multi-CHECKSUM
>        -rw------- 1 doc doc 1294491648 Oct 21 10:06 Fedora-14-Live-multi.iso
>        drwxrwxr-x 2 doc doc       4096 Oct 26 20:02 i386
>        drwxrwxr-x 2 doc doc       4096 Oct 26 20:02 x86_64
>
> Curiously, the difference in file sizes is precisely 4GB. Is this a bug,
> or normal behavior for NFS?

Possibly a bug, depends on if the RHEL server is 64 bit or not, and
you are using NFSv3 (and in TCP). It supposedly works in UDP but I
have had problems myself with large files like that.

> --Doc Savage
>  Fairview Heights, IL
>



-- 
Stephen J Smoogen.
"The core skill of innovators is error recovery, not failure avoidance."
Randy Nelson, President of Pixar University.
"Let us be kind, one to another, for most of us are fighting a hard
battle." -- Ian MacLaren