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Various minor mod's to the tape drive section.
Discourage the use of the EXB-2501 by now, and slightly improve the formatting for this entry. Correct some minor oddities for the Tandberg entries based on my input data. Minor addition to the <!-- tech> section for QIC.
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svn path=/head/; revision=17230
@ -1,4 +1,4 @@
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<!-- $Id: hw.sgml,v 1.32 1996/07/15 19:31:47 jkh Exp $ -->
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<!-- $Id: hw.sgml,v 1.33 1996/07/16 00:15:53 alex Exp $ -->
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<!-- The FreeBSD Documentation Project -->
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<!--
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@ -290,7 +290,6 @@ that we use.
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<sect3><heading> 4mm (DAT: Digital Audio Tape)</heading>
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<p><ref id="hw:storage:python" name="Archive Python"
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<p><ref id="hw:storage:exb2501" name="Exabyte 2501"
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<p><ref id="hw:storage:hp1533a" name="HP C1533A">
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<p><ref id="hw:storage:hp1534a" name="HP C1534A">
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<p><ref id="hw:storage:hp35450a" name="HP 35450A">
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@ -317,6 +316,7 @@ that we use.
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<p><ref id="hw:storage:dectz87" name="Digital TZ87"
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<sect3><heading> Mini-Cartridge</heading>
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<p><ref id="hw:storage:ctms3200" name="Conner CTMS 3200"
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<p><ref id="hw:storage:exb2501" name="Exabyte 2501"
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<sect3><heading> Autoloaders/Changers</heading>
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<p><ref id="hw:storage:hp1553a" name="Hewlett-Packard HP
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C1553A Autoloading DDS2">
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@ -471,7 +471,8 @@ including an Exabyte 8mm drive.
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<htmlurl
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url="http://www.Exabyte.COM:80/Products/Minicartridge/2501/Rfeatures.html"
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name="Exabyte EXB-2501"></heading>
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<p>The boot message identifier for this drive is ""
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<p>The boot message identifier for this drive is "EXABYTE
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EXB-2501"
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<p>This is a mini-cartridge tape drive.
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<p>Native capacity is 1GB when using MC3000XL minicartridges.
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<p>Data transfer rate is XXX
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@ -481,13 +482,20 @@ name="Exabyte EXB-2501"></heading>
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specifications. The drive locks up completely in response to a
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SCSI MODE_SELECT command unless there is a formatted tape in the
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drive. Before using this drive, set the tape blocksize with
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<tt>mt -f /dev/st0ctl.0 blocksize 1024</tt>. Before using a
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minicartridge for the first time, the minicartridge must be
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formated. FreeBSD 2.1.0-RELEASE and earlier: <tt>/sbin/scsi -f
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/dev/rst0.ctl -s 600 -c "4 0 0 0 0 0"</tt> (alternatively, fetch
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a copy of the <tt>scsiformat</tt> shell script from FreeBSD
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2.2). FreeBSD 2.2 and later: <tt>/sbin/scsiformat -q -w
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/dev/rst0.ctl</tt>
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<verb>mt -f /dev/st0ctl.0 blocksize 1024</verb>
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Before using a minicartridge for the first time, the minicartridge
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must be formated. FreeBSD 2.1.0-RELEASE and earlier:
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<verb>/sbin/scsi -f /dev/rst0.ctl -s 600 -c "4 0 0 0 0 0"</verb>
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(Alternatively, fetch a copy of the <tt>scsiformat</tt> shell script
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from FreeBSD 2.1.5/2.2.) FreeBSD 2.1.5 and later:
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<verb>/sbin/scsiformat -q -w /dev/rst0.ctl</verb>
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<p>Right now, this drive cannot really be recommended for FreeBSD.
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<p>Reported by: Bob Beaulieu ez@eztravel.com
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<sect3><heading><label id="hw:storage:exb8200"> Exabyte
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@ -726,7 +734,7 @@ Tandberg TDC 3600</heading>
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<p>The boot message identifier for this drive is
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"TANDBERG TDC 3600 =08:" "type 1 removable SCSI 2"
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<p>This is a QIC tape drive.
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<p>Native capacity is 250MB.
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<p>Native capacity is 150/250MB.
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<p>This drive has quirks which are known and work around
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code is present in the scsi tape device driver (<tt>st(4)</tt>).
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Upgrading the firmware to XXX version will fix the quirks and
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@ -738,28 +746,28 @@ firmware EPROM of these units will solve the problem.
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<sect3><heading><label id="hw:storage:tandberg3620">
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Tandberg TDC 3620</heading>
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<p>The boot message identifier for this drive is
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"XXX" "XXX"
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<p>This is a QIC tape drive.
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<p>Native capacity is MB. XXX ???
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<p>Data transfer rate is XXXkB/s.
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<p>Reported by: J"org Wunsch joerg_wunsch@uriah.heep.sax.de
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<p>This is very similar to the <ref
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id="hw:storage:tandberg3600" name="Tandberg TDC 3600"> drive.
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<p>Reported by: Jörg Wunsch joerg_wunsch@uriah.heep.sax.de
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<sect3><heading><label id="hw:storage:tandberg4222">
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Tandberg TDC 4222</heading>
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<p>The boot message identifier for this drive is
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"TANDBERG TDC 4222 =07" "type 1 removable SCSI 2"
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<p>This is a QIC tape drive.
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<p>Native capacity is 1.5GB. The drive will read all
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<p>Native capacity is 2.5GB. The drive will read all
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cartridges from the 60 MB (DC600A) upwards, and write 150 MB
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(DC6150) upwards.
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(DC6150) upwards. Hardware compression is optionally supported
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for the 2.5 GB cartridges.
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<p>This drives quirks are known and pre-compiled into the
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scsi tape device driver (<tt>st(4)</tt>) beginning with FreeBSD
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2.2-current. For previous versions of FreeBSD, use <tt>mt</tt>
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to read one block from the tape, rewind the tape, and then
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execute the backup program (<tt>mt fsr 1; mt rewind; dump ...</tt>)
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<p>Data transfer rate is 600kB/s.
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<p>Reported by: J"org Wunsch joerg_wunsch@uriah.heep.sax.de
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<p>Data transfer rate is 600kB/s (vendor claim with compression),
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350 KB/s can even be reached in start/stop mode. The rate
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decreases for smaller cartridges.
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<p>Reported by: Jörg Wunsch joerg_wunsch@uriah.heep.sax.de
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<sect3><heading><label id="hw:storage:wangtek5525es">
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Wangtek 5525ES</heading>
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@ -868,7 +876,7 @@ tape drive and media around. QIC tape drives are the least
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expensive "serious" backup drives. The downside is the cost of
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media. QIC tapes are expensive compared to 8mm or 4mm tapes, up
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to 5 times the price per GB data storage. But, if your needs can
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be satisified with a half-dozen tapes. QIC may be the correct
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be satisified with a half-dozen tapes, QIC may be the correct
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choice. QIC is the <em>most</em> common tape drive. Every site
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has a QIC drive of some density or another. Therein lies the
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rub, QIC has a large number of densities on physically similar
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@ -890,7 +898,11 @@ frequently installed; they are being supplanted by DAT drives.
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<p>Data is recorded onto the tape in tracks. The tracks
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run along the long axis of the tape media from one end to the
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other. The number of tracks, and therefore the width of a track,
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varies with the tape's capacity.
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varies with the tape's capacity. Most if not all newer drives
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provide backward-compatibility at least for reading (but often
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also for writing). QIC has a good reputation regarding the
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safety of the data (the mechanics are simpler and more robust
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than for helical scan drives).
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<p>Tapes should be retired from use after 5,000 backups.
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@ -900,7 +912,7 @@ varies with the tape's capacity.
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<sect3><heading><label id="hw:storage:tapebackups:dlt">
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DLT</heading>
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<!--gen-->
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<p>DLT has the faster data transfer rate of all the drive
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<p>DLT has the fastest data transfer rate of all the drive
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types listed here. The 1/2" (12.5mm) tape is contained in a
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single spool cartridge (4 x 4 x 1 inches; 100 x 100 x 25 mm). The
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cartridge has a swinging gate along one entire side of the
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@ -914,7 +926,7 @@ take-up spools located inside the tape cartridge itself.
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<!--spec-->
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Data thruput is approximately 1.5MB/s, three times the
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thruput of 4mm, 8mm, or QIC tape drives. Data capacities range
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from 10GB to 20GB for a single drives. Drive are available in
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from 10GB to 20GB for a single drive. Drives are available in
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both multi-tape changers and multi-tape, multi-drive tape
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libraries containing from 5 to 900 tapes over 1 to 20 drives,
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providing from 50GB to 9TB of storage.
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