Reading from a corrupted tape

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03-28-2008

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Reading from a corrupted tape

I've got a backuptape in cpio format that was accidentally overwritten with a very small batch file. As I assume that the cpio header has been overwritten, I cannot extract files from the backup in the conventional manner:

( cpio -itv </dev/rct0
cpio: this is not a cpio file, bad header)

I've tried dd if=/dev/rct0 of=output which has produced a single large file The cpio actually records the contents of three directories. As these are large I'm hoping that I can recover data from the second and third directories.

Is there a specific dd expression (or any other expression) that I can use to strip out the contents ?

All suggestions appreciated. Thanks.

Martin

mart4179

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LEARN ABOUT REDHAT

amrmtape

AMRMTAPE(8)						      System Manager's Manual						       AMRMTAPE(8)

NAME

       amrmtape - remove a tape from the Amanda database

SYNOPSIS

       amrmtape [ -n ] [ -v ] [ -q ] [ -d ] config label

DESCRIPTION

       Amrmtape  invalidates  the contents of an existing backup tape in the configuration database.  This is meant as a recovery mechanism when a
       good backup is damaged either by faulty hardware or user error, e.g. the tape is eaten by the drive or is overwritten.

       See the amanda(8) man page for more details about Amanda.

OPTIONS

       -n     Generate new tapelist and database files with label removed, but leave them in /tmp and do not update the original copies.

       -v     List backups of hosts and disks that are being discarded.  Enabled by default.

       -q     Opposite of -v.

       -d     Run in debugging mode so all executed commands are shown.

EXAMPLE

       Remove tape labeled DAILY034 from the DailySet1 configuration.

	      # amrmtape DailySet1 DAILY034

AUTHOR

       Adrian T. Filipi-Martin <atf3r@cs.virginia.edu>

SEE ALSO

       amadmin(8), amanda(8)

																       AMRMTAPE(8)

UNIX for Advanced & Expert Users