Appendix C Product Notes for Sun™

The system compiles the kernel and creates special files in /dev so that it can communicate with the SWXTE. Since you booted the system using the verbose switch, the system displays all of its SCSI targets. Verify that “ DEC EXB-8505 8mm Helical Scan /w Compression” is displayed as a target when the system is booting.

At this time, the tape drive is configured in the /dev directory in two ways: rmt format, and rst format.

“rmt” format

In this format, the drive is configured with various options. For further explanations, see the man pages on “ st” (the modes are x, xl, xm, xh, xc, and xu, where x is the rmt number).

∙Options x, xu, and xc, correspond to the 0x8C, (EXB-8500c, compressed) density mode.

∙Option xl, corresponds to the 0x14 (EXB 8200, uncompressed) density mode.

∙Option xm corresponds to 0x90 (EXB-8200c, compressed) density mode.

∙Option xh corresponds to 0x15 (EXB-8500, uncompressed) density mode.

∙Option b associates with the BSD behavior and is for backward compatibility on all of the above options. For further information, refer to the man pages of “ mtio”.

∙The n option provides access to the device with no rewind, similar to nrst (below), and is also applicable to all of the above options.

“rst” format

Special files “rst” (rewind on close) and “nrst” (no rewind on close) are also built and reside in the /dev directory. For example, if the SCSI target ID for the SWXTE is 4, then “rst” will be “rst4, rst12, rst20 , and rst28,”; nrst will be “nrst4, nrst12, nrst20, and

nrst28” .

∙rst4 and nrst4 correspond to the 0x14 density mode (EXB-8200, uncompressed format)

∙rst12 and nrst12 correspond to the 0x90 density mode (EXB-8200c, compressed format)

∙rst20 and nrst20 correspond to the 0x15 density mode (EXB-8500, uncompressed format)

∙rst28 and nrst28 correspond to the 0x8C density mode (EXB-8500c, compressed format)

•To test the SWXTE drive, back-up the file “passwd” to tape using the “tar” command as follows:

tar cvf /dev/rst4

/etc/passwd

The system responds with:

a /etc/passwd

1 blocks

Note that depending on the size of the file, a different number of blocks may be reported.

Order Number: EK–STWCT–UG. E01

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