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Full Discussion: Start copying large file while its still being restored from tape
Top Forums Shell Programming and Scripting Start copying large file while its still being restored from tape Post 302538586 by Corona688 on Wednesday 13th of July 2011 12:22:33 PM
Old 07-13-2011
I'd put tail in the background instead of your tape restore. You can just create an empty file to make sure tail doesn't throw an error.
Code:
: > localfile # Truncate or create zero byte file
tail -f filename > /path/to/nfsfile &
restore_from_tape > localfile

---------- Post updated at 10:22 AM ---------- Previous update was at 10:19 AM ----------

The trouble comes from how to tell tail when it's finished. It's binary-safe I think, but only writes entire lines -- inconvenient when your file may not actually end in a newline. You may have to append a newline onto your local file to kick the last 'line' out of it: echo >> filename Then wait for the file sizes to be equal, kill tail, and truncate both files one byte shorter.
 

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LEARN ABOUT REDHAT

amverify

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

NAME

       amverify - check an Amanda tape for errors

SYNOPSIS

       amverify config [ slot [ runtapes ] ]

DESCRIPTION

       Amverify  reads	an  Amanda  format  tape  and makes sure each backup image can be processed by amrestore and, if possible, the appropriate
       restore program (e.g. tar).

       Amverify runs amrestore on each file of the tape and pipes the output to a restore program (if available) with an option to create a  cata-
       logue of the backup.  The catalogue itself is discarded.  Only the success or failure of the operation itself is reported.

       If  the	backup image cannot be processed by the restore program, e.g. if it was written on a different operating system, the image is sent
       through dd to /dev/null.  This still determines if the tape is readable, but does not do any internal consistency check on the image.

       If config is set up to use a tape changer, the slot argument may be used to choose the first tape to process.  Otherwise, the current  slot
       is used.

       The runtapes configuration parameter determines how many tapes are processed unless it is specified on the command line.

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

AUTHOR

       Axel Zinser <fifi@icem.de>

SEE ALSO

       amrestore(8), amanda(8), amverifyrun(8)

																       AMVERIFY(8)
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