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Start copying large file while its still being restored from tape

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Old 07-15-2011
I'd still recommend some way to verify the entire file made it across, like an md5 sum on both sides.

Read-behind-write is fraught with lots of chances to not get the entire file. You pretty much have to know that your entire software stack is set up properly. Even in the sleep-then-cat example, and even if the network is supposedly guaranteed to be slower than the tape, any hiccup reading the tape - or in the data path from tape to disk - could allow the cat to catch up with the file end.

Never mind what happens if you run into a restore process that sets the file length prior to actually writing out the data....
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LEARN ABOUT DEBIAN

read_tape

READ_TAPE(8)						       AFS Command Reference						      READ_TAPE(8)

NAME

       read_tape - Reads volume dumps from a backup tape to a file

SYNOPSIS

       read_tape -tape <tape device>
	  -restore <# of volumes to restore>
	  -skip <# of volumes to skip>
	  -file <filename> [-scan] [-noask] [-label]
	  [-vheaders] [-verbose] [-help]

DESCRIPTION

       read_tape reads an OpenAFS backup tape and prompts for each dump file to save.  This command does not require any OpenAFS infrastructure.
       This command does not need an OpenAFS client or server to be available, which is not the case with the backup(8) command.

       The dump files will be named for the Read/Write name of the volume restored.  After saving each dump file, vos restore or restorevol can be
       used to restore the volume into AFS and non-AFS space respectively.

       read_tape reads the tape while skipping the specified number of volumes.  After that, it restores the specified number of volumes.
       read_tape doesn't rewind the tape so that it may be used multiple times in succession.

OPTIONS

       -tape <tape device>
	   Specifies the tape device from which to restore.

       -restore <# of volumes to restore>
	   Specifies the number of volumes to restore from tape.

       -skip <# of volumes to skip>
	   Specifies the number of volumes to skip before starting the restore.

       -file <filename>
	   Specifies an alternate name for the restored volume dump file rather than the default of the volume name.

       -scan
	   Scans the tape.

       -noask
	   Doesn't prompt for each volume.

       -label
	   Displays the full dump label.

       -vheaders
	   Displays the full volume headers.

       -verbose
	   Produces on the standard output stream a detailed trace of the command's execution.	If this argument is omitted, only warnings and
	   error messages appear.

       -help
	   Prints the online help for this command. All other valid options are ignored.

EXAMPLES

       The following command will read the third through fifth volumes from the tape device /dev/tape without prompting:

	  % read_tape -tape /dev/tape -skip 2 -restore 3 -noask

PRIVILEGE REQUIRED

       The issuer must have access to read and write to the specified tape device.

SEE ALSO

       backup(8), restorevol(1), vos_restore(1)

COPYRIGHT

       Copyright 2007 Jason Edgecombe <jason@rampaginggeek.com>

       This documentation is covered by the BSD License as written in the doc/LICENSE file. This man page was written by Jason Edgecombe for
       OpenAFS.

OpenAFS 							    2012-03-26							      READ_TAPE(8)