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- TARCHIVE - File/Tape Archiver Program - Ver 1.2B
- by Andreas Schiffler - University of Saskatchewan
- ============================================================================
-
- Introduction
- ------------
-
- Tarchive is a DOS command-line tape archiver program for the Exabyte 8500 or
- 8505 tape drives operating in the 4.9 GByte mode. This program is meant to
- replace the TAR program and enhance it by using some of the specific
- features of the EXB-8500 family of tape drives. This means that this program
- will not work with the older Exabyte 8200 drives since they do not support
- the SCSI-commands used by Tarchive. DAT drives should however work, if they
- support block-seek commands (this is not tested). Tarchive is not TAR
- compatible, but uses its own format for increased speed and security of the
- archiving process.
- Also provided are sources for a tape-erase program and a simple file
- archiver.
-
- Features
- --------
-
- * fast save and backup operation through use of buffering mode and large
- blocksize
- * directory information of each saveset is kept with saveset for quicker
- access of individual files
- * fast file retrieval by use of direct data-block search
- * increased data security by use of a magic code in header and a checksum
- * advanced error checking implemented for Exabyte drives
- * extensive error logging possible
- * filename-list mode for simple interfacing with other programs
- * tape erase/conditioning program is included
-
- Disadvantages
- -------------
-
- * the format is not TAR compatible
- * does not store path information
- * number of files per saveset limited (approx. 15 thousand)
-
- Command line usage
- ------------------
- | means or, <...> means substitute value, [...] means optional
-
- TARCHIVE a|x|l <LUN:saveset> <wildcard>|@<filelist> [<options>]
-
- Function:
- .........
-
- a - create a new archive an add files to it
-
- x - extract files from an existing archive
-
- l - list directory of an existing archive
-
- Tape identification
- ...................
-
- LUN - local unit number of the tape drive (1-7), depends on the system
- configuration and will be displayed by the SCSI-BIOS at boot time
-
- save-set - the number of the save set to work with (1,2,3,...). The saveset
- number must point to a saveset that exists (for options X and L) or to a
- saveset number which is one larger that the last existing saveset (for
- option a). If the a option is used on an existing saveset, that one and all
- subsequent savesets will be overwritten and all information will be lost.
-
- Scope
- .....
-
- wildcard - valid DOS wildcard to identify files in the current directory
-
- @filelist - filename of a textfile containing the filenames to be archived.
- The sysntx is simple: one filename per line. The filenames should not
- include path information.
-
- Options
- .......
-
- LOG=<filename> - sets the error log to 'filename'. The default error report
- is printed on the screen. If the logfile exists, the text is appended to the
- existing file.
-
- WORDY=FALSE - default is TRUE, so this option turns off most of the
- informational messages that are usually displayed
-
- TIMEDISP=FALSE - default is TRUE, so this option turns off the time in the
- error messages
-
- TIMEOUT=<minutes> - sets the timeout period in minutes, if the tape does not
- respond to the program. In case of a timeout, the program will abort. A
- reasonable time is several minutes to give the drive time to recover from
- tracking problems or tape winding.
-
- TAPE=<identifier> - sets the tape size. This is used to approximate the
- space left on the tape. Valid identifiers are for EXABYTE drives and
- include: P5-15, P5-30, P5-60, P5-90, P6-15, P6-30, P6-60, P6-90, P6-120
-
- RESET=TRUE - will force an ASPI reset whenever Tarchive initializes the tape
- drive. The reset will slow the startup process by about one minute, but for
- unattended operation this option is highly reccomended to avoid lockups.
-
- Compilation and Sources
- -----------------------
-
- All programs require Borland/Turbo Pascal 6.0 and up to compile.
-
- archiv.pas basic file archiver: reads multiple files from disk and
- stores them with a directory in a single file
- tarchiv.pas Exabyte/DAT tape archiver: uses ASPI calls to store
- multiple files in single save sets on tape, includes
- complete tape control
- terase.pas Tape eraser: erases tapes, multiple erases possible for
- tape conditioning
-
- xxx.pas units used by the above programs
-
-
- Data Format
- -----------
-
- Each save set consists of a directory, the files and a filemark at the end.
-
- Saveset=Directory,File,File,...,File,Filemark
-
- The directory is just another file containing reference information. It has
- to be the first file in the set. Its structure is as follows:
-
- Directory=Filename,Filesize,Filetime,Position
-
- Filename=STRING[12]
- Filesize=Longint
- Filetime=Longint
- Position=Longint
-
- Files are the packages that get written:
-
- File=Header,Data,Checksum
-
- Header=MagicCode,Filename,Filesize,Filetime
- Data=File (byte stream containing the data)
- Checksum=Longint (sum of all data bytes)
-
- MagicCode=T#6archi#7 (7 bytes)
-
- Tarchive uses fixed length blocks of 32 Kbytes size.
-
- The Author
- ----------
-
- Andreas Schiffler
-
- 1230 11th St. E
- Saskatoon, Sask
- S7H 0G3
- Canada
-
- Phone (306) 374-2431
- FAX (306) 652-7849
- e-mail: andreas@karlsberg.usask.ca
- e-mail: andreas@milo.usask.ca
- e-mail: schiffler@skisas.usask.ca
-
-
- -------------
-
- Copyright (C) 1994, 1995 by Andreas Schiffler.
-
- Permission to use, copy, modify, and distribute this software and its
- documentation for any purpose and without fee is hereby granted, provided
- that the above copyright notice appear in all copies and that both that
- copyright notice and this permission notice appear in supporting
- documentation. This software is provided "as is" without express or
- implied warranty.
- ---------
-