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[S390] remove tape block docu

After git commit 66ceed5 removed
the tape block device driver, remove its documentation as well.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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1 parent 6bed05b commit 9e280f6693083baf1b7741c2b820be8d4109509e Martin Schwidefsky committed Jul 24, 2011
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-Channel attached Tape device driver
-
------------------------------WARNING-----------------------------------------
-This driver is considered to be EXPERIMENTAL. Do NOT use it in
-production environments. Feel free to test it and report problems back to us.
------------------------------------------------------------------------------
-
-The LINUX for zSeries tape device driver manages channel attached tape drives
-which are compatible to IBM 3480 or IBM 3490 magnetic tape subsystems. This
-includes various models of these devices (for example the 3490E).
-
-
-Tape driver features
-
-The device driver supports a maximum of 128 tape devices.
-No official LINUX device major number is assigned to the zSeries tape device
-driver. It allocates major numbers dynamically and reports them on system
-startup.
-Typically it will get major number 254 for both the character device front-end
-and the block device front-end.
-
-The tape device driver needs no kernel parameters. All supported devices
-present are detected on driver initialization at system startup or module load.
-The devices detected are ordered by their subchannel numbers. The device with
-the lowest subchannel number becomes device 0, the next one will be device 1
-and so on.
-
-
-Tape character device front-end
-
-The usual way to read or write to the tape device is through the character
-device front-end. The zSeries tape device driver provides two character devices
-for each physical device -- the first of these will rewind automatically when
-it is closed, the second will not rewind automatically.
-
-The character device nodes are named /dev/rtibm0 (rewinding) and /dev/ntibm0
-(non-rewinding) for the first device, /dev/rtibm1 and /dev/ntibm1 for the
-second, and so on.
-
-The character device front-end can be used as any other LINUX tape device. You
-can write to it and read from it using LINUX facilities such as GNU tar. The
-tool mt can be used to perform control operations, such as rewinding the tape
-or skipping a file.
-
-Most LINUX tape software should work with either tape character device.
-
-
-Tape block device front-end
-
-The tape device may also be accessed as a block device in read-only mode.
-This could be used for software installation in the same way as it is used with
-other operation systems on the zSeries platform (and most LINUX
-distributions are shipped on compact disk using ISO9660 filesystems).
-
-One block device node is provided for each physical device. These are named
-/dev/btibm0 for the first device, /dev/btibm1 for the second and so on.
-You should only use the ISO9660 filesystem on LINUX for zSeries tapes because
-the physical tape devices cannot perform fast seeks and the ISO9660 system is
-optimized for this situation.
-
-
-Tape block device example
-
-In this example a tape with an ISO9660 filesystem is created using the first
-tape device. ISO9660 filesystem support must be built into your system kernel
-for this.
-The mt command is used to issue tape commands and the mkisofs command to
-create an ISO9660 filesystem:
-
-- create a LINUX directory (somedir) with the contents of the filesystem
- mkdir somedir
- cp contents somedir
-
-- insert a tape
-
-- ensure the tape is at the beginning
- mt -f /dev/ntibm0 rewind
-
-- set the blocksize of the character driver. The blocksize 2048 bytes
- is commonly used on ISO9660 CD-Roms
- mt -f /dev/ntibm0 setblk 2048
-
-- write the filesystem to the character device driver
- mkisofs -o /dev/ntibm0 somedir
-
-- rewind the tape again
- mt -f /dev/ntibm0 rewind
-
-- Now you can mount your new filesystem as a block device:
- mount -t iso9660 -o ro,block=2048 /dev/btibm0 /mnt
-
-TODO List
-
- - Driver has to be stabilized still
-
-BUGS
-
-This driver is considered BETA, which means some weaknesses may still
-be in it.
-If an error occurs which cannot be handled by the code you will get a
-sense-data dump.In that case please do the following:
-
-1. set the tape driver debug level to maximum:
- echo 6 >/proc/s390dbf/tape/level
-
-2. re-perform the actions which produced the bug. (Hopefully the bug will
- reappear.)
-
-3. get a snapshot from the debug-feature:
- cat /proc/s390dbf/tape/hex_ascii >somefile
-
-4. Now put the snapshot together with a detailed description of the situation
- that led to the bug:
- - Which tool did you use?
- - Which hardware do you have?
- - Was your tape unit online?
- - Is it a shared tape unit?
-
-5. Send an email with your bug report to:
- mailto:Linux390@de.ibm.com
-
-

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