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Diffstat (limited to 'sys/doc/wt.doc')
| -rw-r--r-- | sys/doc/wt.doc | 77 |
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diff --git a/sys/doc/wt.doc b/sys/doc/wt.doc new file mode 100644 index 000000000000..1e9f1bafec8a --- /dev/null +++ b/sys/doc/wt.doc @@ -0,0 +1,77 @@ +This is the streamer tape driver for 386bsd and FreeBSD, which +supports Wangtek and Archive compatible QIC-02/QIC-36 controllers. +It was developed as a replacement of the old Wangtek tape driver from CMU. + +In comparison with the CMU driver, this version has the following enhancements: +1) Support for Archive SC402 and SC499 tape controllers added. +2) Support for up to three tape controllers on the same machine. +3) Support for BSD-style ioctls MTIOCGET, MTIOCTOP. + Mt command now works adequately with this driver. +2) Asynchronous REWIND and FSF operations, close() will not wait + until they finish. The next open() will wait for it instead. +4) Use of WTQICMD ioctl is limited to ERASE and RETENS operations. + This prevents the user from locking the tape driver by strange + tape operations. +5) Tape density switching added. +6) The status of the process, blocked on the tape operation, + is displayed at the WCHAN column of the `ps' command as: + + wtread reading data from the tape + wtwrite writing data to the tape + wtrfm reading the tape marker + wtwfm writing the tape marker + wtrew rewinding the tape + wterase doing WTQICMD ERASE operation + wtretens doing WTQICMD RETENS operation + wtorew doing MTIOCTOP REW/OFFL operation + wtorfm doing MTIOCTOP FSF operation + wtowfm doing MTIOCTOP WEOF operation + +7) It's possible to use the tape with "default density", + useful for devices which don't support density switching + or do automatic format determination. +8) Some controllers support only 1024 block length. + Setting WT_BSIZE bit in device minor number turns on this mode. + +Minor number structure: + 0bfffuuu +Fields: + uuu - Unit number. It's possible to install + up to three tape controllers on the same machine, + using DRQs 1..3. Hence, unit number can lie + in range 0..2. + fff - Tape format number: + 0 - /dev/rwt0 - default density (auto select) + 1 - /dev/rwt0a - QIC 11 (obsolete) + 2 - /dev/rwt0b - QIC 24 (60 megabytes) + 3 - /dev/rwt0c - QIC 120 (120 megabytes) + 4 - /dev/rwt0d - QIC 150 (150 megabytes) + 5 - /dev/rwt0e - QIC 300 (300 megabytes?) + 6 - /dev/rwt0f - QIC 600 (600 megabytes?) + b - Long block size flag. With this bit set, + the driver will perform all i/o operations + with the controller using 1024-byte + blocks, instead of 512 ones. + Some controllers need it (CMS for example). + If you Wangtek controller does not stream well, + you can try to use /dev/rWt0 device instead + of /dev/rwt0 (uncomment needed lines in /dev/MAKEDEV + to create it). + +Block interface (writing blocks less than 2048 bytes) is not functioning +pwoperly. Use raw interface instead. + +Thanks to all who helped to test it on the following hardware: + +Controller Drive Volume Interface Thanks to +--------------------------------------------------------------------------- +Archive SC-499 Archive 2150L 150 Meg QIC-02 KIAE +CMS? ? 150 Meg QIC-02 KIAE +Everex EV 831/833 ? ? QIC-36 Joergen Haegg +Wangtek ASSY Wangtek 60 Meg QIC-02 Ken Whedbee +Tecmar QT150i? Wangtek 5150EQ ? QIC-02? Marko Teiste +? Wangtek 5099EK 60 Meg QIC-36 Robert Shien +Archive SC400S ? 60 Meg ? Warren Toomey + +Sergey Ryzhkov, Serge Vakulenko +E-mail: <sir@kiae.su>, <vak@zebub.msk.su> |