On Thu, Aug 08, 2002 at 05:32:24PM -0400, walt wrote:
> I've run into a strange problem either with diff or with the file system. I
> have an iso image of a gzipped file called db.iso. If I copy that file to a
> new file on the same partition and run diff, it tells me they differ. Also,
> when I copy the file via nfs(see example below for /fs2-backup/), it corrupts
> the gzip, but not when I scp the file. Any help would be greatly appreciated!
> Here are a few examples:
>
> [root@walt mysql_archive]# cp db.iso db.iso-1
^^^^^^^^^^^^^
Where is this directory? You provide fstab, but don't tell
which of the filesystems is involved.
> [root@walt mysql_archive]# diff db.iso db.iso-1
> Binary files db.iso and db.iso-1 differ
Have you tried to compare them with something else too? Computing
checksums, stating (to see if they have the same size), cmp -b to see
how much they actually differ?
> [root@walt mysql_archive]# cp /boot/vmlinuz-2.4.18-3 .
> [root@walt mysql_archive]# diff /boot/vmlinuz-2.4.18-3 vmlinuz-2.4.18-3
> [root@walt mysql_archive]#
>
> [root@walt mysql_archive]# cp vmlinuz-2.4.18-3 timma
> [root@walt mysql_archive]# diff vmlinuz-2.4.18-3 timma
> [root@walt mysql_archive]#
>
> [root@walt mysql_archive]# cp db.iso ../
> [root@walt mysql_archive]# diff db.iso ../db.iso
> Binary files db.iso and ../db.iso differ
>
> [root@walt mysql_archive]# cp db.iso /opt/
> [root@walt mysql_archive]# diff db.iso /opt/db.iso
> [root@walt mysql_archive]#
>
>
> [root@walt mysql_archive]# cp /fs2-backup/db.iso .
> [root@walt mysql_archive]# mount -t iso9660 -o loop db.iso /mnt/cdrom1/
>
> [root@walt cdrom1]# gunzip -c nea.dmp.gz > /opt/burn/nea.dmp
>
> gunzip: nea.dmp.gz: invalid compressed data--crc error
>
> gunzip: nea.dmp.gz: invalid compressed data--length error
>
> [root@walt mysql_archive]# umount /mnt/cdrom1/
>
> [root@walt mysql_archive]# scp fs2:/backup/db.iso .
> root@walt mysql_archive]# mount -t iso9660 -o loop db.iso /mnt/cdrom1/
> [root@walt cdrom1]# gunzip -c nea.dmp.gz > /opt/burn/nea.dmp
> [root@walt cdrom1]#
>
> This is really frustration because this is a weekly archive of our database
> exports and most of the time, the gzipped file on the cd is corrupt even
> though I can gunzip the original file.
>
> System information:
> [root@walt mysql_archive]# uname -a
> Linux walt 2.4.18-3 #1 Thu Apr 18 07:37:53 EDT 2002 i686 unknown
>
> [root@walt mysql_archive]# cat /etc/issue
> Red Hat Linux release 7.3 (Valhalla)
>
> [root@walt mysql_archive]# cat /etc/fstab
> LABEL=/ / ext2 defaults 1 1
> none /dev/pts devpts gid=5,mode=620 0 0
> none /proc proc defaults 0 0
> none /dev/shm tmpfs defaults 0 0
> LABEL=/usr /usr ext3 defaults 1 2
> LABEL=/storage /opt ext3 defaults 1 2
> /dev/hdc1 swap swap defaults 0 0
> /dev/hda2 swap swap defaults 0 0
> /dev/cdrom /mnt/cdrom iso9660 noauto,owner,kudzu,ro
> 0 0
> /dev/cdrom1 /mnt/cdrom1 iso9660 noauto,owner,kudzu,ro
> 0 0
> /dev/fd0 /mnt/floppy auto noauto,owner,kudzu 0 0
Plaease include you actual /etc/mtab (or better yet /proc/mounts) at the
moment of tests. This does not state things like nfs you mentioned.
It seems more like kernel problem.
See if vanilla 2.4.19 kernel you build from sources yourself works for
you. Mind there were some issues with gdb in RedHat - you need to
compile using "kgcc" - make sure you compile with gcc 2.95.4 (called
kgcc in some RedHats) and not gcc 3 (often found as default gcc in
RedHat).
See REPORTING-BUGS in kernel sources and try to include information
mentioned there. Important information would be what drivers are
compiled in your kernel, that is kernel configuration. Try several
kernel versions. Try different konfigurations (turn of seemingly
unrelated drivers, turn on and off varuous IDE bugfixes).
Cross-post to linux-kernel@vger.kernel.org with this additional info on
your system.
> Cheers!
> --
> Walter Anthony
> System Administrator
> National Electronic Attachment
> Atlanta, Georgia
> 1-800-782-5150 ext. 1608
> "If it's not broke....tweak it"
-------------------------------------------------------------------------------
Jan 'Bulb' Hudec <bulb@ucw.cz>
--
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