Thread View: comp.sys.next.sysadmin
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Started by Sherwood Botsford
Wed, 19 Aug 1992 19:19
TarChive on Sonata
Author: Sherwood Botsford
Date: Wed, 19 Aug 1992 19:19
Date: Wed, 19 Aug 1992 19:19
63 lines
2792 bytes
2792 bytes
Welcome to TarChive 0.7 This is a command line method of maintaining your sanity when dealing with tapes. The TarChive package is a set of Perl scripts, and two binary files that together make a sensible way to deal with tapes. This is a preliminary release. (escape?) Use with the due caution for any beta software. I appreciate bugs reports, suggestions, etc. Tapes have several drawbacks as means of storing information. They're slow. You have to read the whole tape to find out what's on it. You often aren't quite sure if what you think is there is really there. You have little protection from someone else writing on the tape if you leave it in the drive. If you have serveral tapes they are difficult for programs to tell apart. (Generally you have to go look at the label.) If there is a glitch in the tape, you've usually lost the rest of the archive. TarChive has partial solutions to most of the problems above. Speed: TarChive encourages creating archives in the 20-100 MB range. Because of this you can use the much faster file positioning commands (10-100 times faster than reading the tape). Directories: TarChive keeps log files of whatever it puts on tape. So later, a single grep command will tell you that file x is in the 11th archive on tape Y. Verification: TarChive writes an archive to tape, then reads it back and compares it to the original. Tape Labeling: TarChive will not write on a tape that is not labeled. TarChive will not write on a tape not owned by the user. TarChive will not write on a tape that is not registered on the system. All log files refer to the tape label so that you can easily determine what is on each tape. Error recovery: TarChive uses gnutar as it's tarring command. If gnutar can't read a part of the tape, it moves on to the next file header within the archive, and carries on from there. Losses are minimized. Driver glitches: On occasion Next's tape driver decides to reset the tapedrive. TarChive keeps track of what tapefile is being written, and when a reset occures, repositions the tape to the correct tar file, and carries on. Prerequisites: In addition to this package, you need gnutar 1.10 and perl 4.1
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