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From: krowitz%richter@UMIX.CC.UMICH.EDU (David Krowitz)
Newsgroups: comp.sys.apollo
Subject: Re:  tar vs wbak
Message-ID: <9001121409.AA01526@richter.mit.edu>
Date: 12 Jan 90 14:09:30 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
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tar can be used with /dev/rct8 or /dev/rct12 (auto rewind vs. not auto rewind).
tar sometimes will not work if it doesn't think that the tape has been rewound.
Use "mt -f /dev/rct8 rewind" or "/com/rbak -dev ct -rewind" in this case. The
major advantage of wbak/rbak over tar is that the Apollo-specific utilities will
1) handle multi-tape backups -- tar will bomb if the directory will not fit on
   a single tape.
2) will restore directories with names other than the original. If you save
   /somedir/otherdir/my_dir with tar, you must restore it to the exact same
   directory. If the machine you are restoring on does not have the
  /somedir/otherdir directory it will have to be created. wbak/rbak will let
  you change the name as you restore the tape.
3) On SR9.7 systems, tar will not store the Apollo file types on the tape.
   Executable files will no longer be executable when restored. On SR10 systems
   there is a new -A switch which will get around this problem.


 -- David Krowitz

krowitz@richter.mit.edu   (18.83.0.109)
krowitz%richter.mit.edu@eddie.mit.edu
krowitz%richter.mit.edu@mitvma.bitnet
(in order of decreasing preference)