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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 302538172 by swamik on Tuesday 12th of July 2011 03:16:24 AM
Old 07-12-2011
Start copying large file while its still being restored from tape
Hello, I need to copy a 700GB tape-image file over a network. I want to start the copy process before the tape-image has finished being restored from the tape. The tape restore speed is about 78 Mbps and the file transfer speed over the network is about 45 Mbps I don't want to use a pipe, since that will limit the tape drive speed to 45Mbps (and I want it to run at full speed). Ideally I would like to have some kind of temporary file used as a buffer that I could write to and read from simultaneously. Restoring the image from tape takes about 2hrs 40min, and copying the file over the network about 4hrs. So running both operations one after the other takes 6hrs 40min. I'm looking at ways of reducing the total time by starting the copy process while the tape is still restoring the file. Note: I don't want to restore the tape image directly over the network for various reasons, including permissions issues etc... I have seen the mbuffer command, which seems to offer what I need on a linux platform. However I'm using the shell on a Mac OS which doesn't provide that. Any suggestions on how I could accomplish this would be much appreciated. Kind Regards Swami
 

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LEARN ABOUT REDHAT

amtape

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

NAME

       amtape - user interface to Amanda tape changer controls

SYNOPSIS

       amtape config command [ command options ]

DESCRIPTION

       Amtape performs tape changer control operations.  It uses the underlying tape changer script defined by the tpchanger option for a particu-
       lar Amanda configuration as specified by the config argument.

       Tape changers maintain a notion of the current and next slot for each configuration.  These may or may not correspond to an actual physical
       state  of  the device, but do tend to minimize searching through the tape storage slots.  If the desired tape is in the current slot, it is
       likely the next tape needed is in the next slot rather than at some random position in the storage slots.

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

COMMANDS

       reset  Reset the tape changer to a known state.	The current slot is set to the first slot.  Other device-specific side effects may  occur.
	      Some  gravity stackers need to be reset to the top position by hand.  This command notifies Amanda the stacker is back in that posi-
	      tion.

       eject  If a tape is loaded in the drive, it is ejected and returned to the slot from which it was loaded.

       clean  If a cleaning tape is defined for the changer, it is used to clean the drive.

       show   Show the contents of all slots.  This can be slow.

       label label
	      Search for and load the Amanda tape with label label.

       taper  Perform the taper scan algorithm.  Load the next tape in the configuration's tape sequence, or a fresh tape with a suitable label.

       device Display the name of the current tape device on stdout.

       current
	      Display the current slot.

       update Update the changer label database, if it has one, to match the tapes now available.

       slot slot
	      Eject any tape in the drive and put it away, then load the tape from slot slot and reset current.

       slot current
	      Eject any tape in the drive and put it away, then load the tape from the current slot.

       slot prev
	      Eject any tape in the drive and put it away, then load the tape from the previous slot and reset current.

       slot next
	      Eject any tape in the drive and put it away, then load the tape from the next slot and reset current.

       slot first
	      Eject any tape in the drive and put it away, then load the tape from the first slot and reset current.

       slot last
	      Eject any tape in the drive and put it away, then load the tape from the last slot and reset current.

       slot advance
	      Eject any tape in the drive and put it away.  Advance current to the next tape, but do not load it.

	      This is useful with non-gravity stackers to unload the last tape used and set up Amanda for the next run.  If you  just  use  eject,
	      the  current  tape will be mounted again in the next run, where it will be rejected as being still in use, ejected and the next tape
	      requested.  Using slot next followed by eject does an unnecessary mount.

       Note: most changers optimize the slot commands to not eject the loaded tape if it is the one being requested.

AUTHOR

       James da Silva <jds@cs.umd.edu>
       University of Maryland, College Park

SEE ALSO

       amanda(8)

																	 AMTAPE(8)
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