On Wed, Aug 11, 2010 at 05:03:47PM -0500, Stephen Gelman wrote:
> On 08/11/2010 03:35 PM, John Rouillard wrote:
> > On Wed, Aug 11, 2010 at 01:44:19PM -0500, Stephen Gelman wrote:
> >> On 08/11/2010 12:33 PM, John Rouillard wrote:
> >>> On Wed, Aug 11, 2010 at 10:23:59AM -0500, Stephen Gelman wrote:
> >>>> I am running BackupPC 3.1.0 on Nexenta. It seems to be working for the
> >>>> most part. I am having a problem with BackupPC_tarCreate. I am trying
> >>>> to create a tar of a 30gb backup. The tar I create ends up being 30gb,
> >>>> but when extracted it only takes up 5gb and is missing a lot of files.
> >>>> I can restore the missing files using the web interface, so I know that
> >>>> they are being backed up and that BackupPC has permission to access
> >>>> them. Does anyone have any idea what's going on? The only clue I have
> >>>> is that I repeatedly get "tar: Skipping to next header" when untaring
> >>>> the file.
> >>> Which tar are you using to do the restore: native solaris /usr/bin/tar
> >>> (or /usr/sbin/static/tar), gnu tar, pax? How are you supplying the 30
> >>> GB file to the restoring tar, stdin as a file on the command line ...?
> >>>
> >>> Do you have any compression in the picture? Also are you moving
> >>> between architectures or little to big endian machines?
> >>>
> >> Using gnu tar. This happens both if I pipe the output of
> >> BackupPC_createTar directly to tar and if I untar from the file. More
> >> specifically, the tar command I am using is "tar -xf - -C MYDIRECTORY".
> >> No compression and the archive is staying on the same server.
> >
> > If you have pax installed does using it in place of tar produce better
> > diagnostics (e.g. why it doesn't look like file header)?
> When I try and extract the tar file using pax, I get a lot of errors
> similar to the following:
>
> pax: checksum error on header record : 4m^[.^UUWD/1
> pax: test.tar : This doesn't look like a tar archive
> pax: test.tar : Skipping to next file...
> pax: checksum error on header record : CE/9j^G:ly4O
> pax: test.tar : Skipping to next file...
Hmm, well that's not giving me any ideas. It should look like:
nulls{490 approx)>./hosts~
(more nulls)0000644^@0000399^@000020^@00000025463^@11426076256^@011677^
<nulls>ustar<null>user<null padding of header record>
so sure enough those strings don't look like fields in a header
record. Sill question if you run pax in verbose mode, is there
something unusual about the files that occur before these errors: >2gb
or 4 gb in size ...?
As you can tell I am running out of ideas.
--
-- rouilj
John Rouillard System Administrator
Renesys Corporation 603-244-9084 (cell) 603-643-9300 x 111
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