Re: Corruption
From: J.L. Coenders (fedora_at_universalgrid.nl)
Date: 04/30/04
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Date: Fri, 30 Apr 2004 21:24:02 +0200 To: For users of Fedora Core releases <fedora-list@redhat.com>
How can I manually start fsck? Usually it only starts when power fails... when
I try to start manually, it warns me about the device which is mounting. When
I try to unmount, it wont work, probably because it is the main disk.
Jeroen
On Friday 30 April 2004 21:16, Martin Stone wrote:
> Sounds like disk problems... but weird ones. Have you fsck'ed lately?
> Here's a really WEIRD suggestion... try creating an archive, then creating
> another archive, then seeing if you get the same error on the second one...
> if there just happens to be a bad spot on the disk where you're trying to
> create that archive, the first one will take up the space and the second
> one would hopefully be on a cleaner part of the disk. If you get an error
> on the second one too, i dunno man... that's pretty weird. Maybe leave
> those two archives on the disk and fsck? If there is a file with a bad
> block in it (rather than a bad block in free space) I would think fsck
> would pick right up on it.
>
> J.L. Coenders wrote:
> > Ok,
> > I did more extensive tests now.
> > $tar cf - Mail | tvf -
> > gives no errors.
> >
> > $ tar czf - Mail | tar tzvf -
> > gives no error either.
> >
> > For the mail and for other files.
> > However, when I start writing to a file, things go wrong:
> > $ tar tzvf <archive>
> > starts reporting errors and
> > $ tar dzf <archive>
> > starts reporting differences.
> >
> > However, when I nfs the files to another computer, I can tar & gzip the
> > files, the test reports no errors and the difference test reports no
> > differences.
> >
> > But what is strange is that when I tar & gzip from the other computer
> > over the nfs-mount, it starts giving the errors again.
> >
> > Any ideas?
> > Jeroen
> >
> > On Friday 30 April 2004 16:57, Martin Stone wrote:
> >>what happens when you do it without compression? As a test, try:
> >>
> >>tar cf - Mail | tar tvf -
> >>
> >>Then, if that works with no problems:
> >>
> >>tar czf - Mail | tar tzvf -
> >>
> >>If that works, the only thing left that I can think of is serious disk
> >>problems... let me know if those commands report errors or not though...
> >>
> >>J.L. Coenders wrote:
> >>>>Does the corruption happen with different sources to tar/gzip/bzip2?
> >>>
> >>>I am now testing some other sources. It seems to happen with large
> >>> files.
> >>>
> >>>>Does while archiving in verbose mode appear any error message?
> >>>
> >>>No, the archiving itself does not give any messages. The testing does.
> >>>
> >>>>What are the commands you run?
> >>>
> >>>$ tar cvzf mail.tar.gz Mail
> >>>or
> >>>$ tar cvjf mail.tar.bz2 Mail
> >>>
> >>>For the testing I use:
> >>>$ tar tvzf mail.tar.gz
> >>>or
> >>>$ tar tvjf mail.tar.bz2
> >>>
> >>>>Compression errors often occurs because of bad/damaged RAM.
> >>>
> >>>I do not seem to have other problems, which you would expect with bad or
> >>>damaged RAM.
> >>>
> >>>Jeroen
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