TITLE    : Using the 'dd' command to backup raw partitions.
OS LEVEL : AIX 
DATE     : 23/06/98
VERSION  : 1.0

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The 'savevg' command can be used to backup user volume groups. All logical 
volume information is archived, as well as JFS mounted filesystems. 
However, this command cannot be used to backup raw logical volumes.

To save a raw logical volume, use 'dd' following the steps below:

1. Check the block size of the tape using the 'tctl' command:

   tctl -f /dev/rmtx status 
   (where x is the tape drive)

2. Change the block size of the tape to your required block size:

   chdev -l rmtx -a block_size=bs	
   (where bs is the tape block size required)

3. Save the raw logical volume onto a tape device using:

   dd if=/dev/lvname of=/dev/rmtx ibs=512 obs=bs