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This topic is available in English only.

contents of this section	related topics
determining the SCSI ID		verifying installation
configuring the device files		glossary
MTCAN and constants values

determining the SCSI id

Before you configure your system to support your new HP Surestore DLT1 drive, you need to determine what SCSI ID to use. The SCSI ID must be unique for each device attached to the SCSI bus. To list the existing devices, use the following command:

% hinv -v grep SCSI

This will produce output similar to the following:

Integral SCSI controller 0: Version WD33C93B, revision D

Disk drive: unit 1 in SCSI controller 0

In this, “unit X” indicates the SCSI ID. Review the list of existing SCSI IDs and choose an available ID to assign to your new tape drive.

configuring the device files

To install the HP Surestore DLT1 drive on a Silicon Graphics system running IRIX, you will need to modify the kernel configuration file.

If you want tar to default to short block transfers, change the 512*512 in your tpsc or scsi HP entry to 128*512 (128-kilobyte blocks) or, better still, 64*512 (64-kilobyte blocks).

1Select the name of the kernel configuration file for your version of IRIX from the list below and open it with a text editor:

For IRIX 6.2 and later: /var/sysgen/master.d/scsi

2Find the following entry in the kernel configuration file and copy it to a new location in the file where you can edit it as appropriate for your tape drive:

For IRIX 6.2:

{DECDLT, TPDLT,8,4,"BNCHMARK","DLT1",0,0,{0},

MTCAN_BSFMTCAN_BSRMTCAN_APPEND

MTCAN_PREVMTCAN_SYNCMTCAN_SPEODMTCAN_CHKRDYMTCAN_VAR MTCAN_SETSZMTCAN_SILIMTCAN_SEEKMTCAN_COMPRESS, /*minimum delay to I/O is 4 minutes, because when a retry is *performed, the drive retries a number of times, and then

*rewinds to BOT, repositions, and tries again.*/ 40, 4*60, 20*60, 5*60, 512, 64*512, 0, (u_char*)0 },

For IRIX 6.4/6.5:

{ DATDLT, TPDLT, 8, 4, "BNCHMARK", "DLT1", 0, 0, {0},

MTCAN_BSFMTCAN_BSRMTCAN_APPEND

MTCAN_PREVMTCAN_SYNCMTCAN_SPEODMTCAN_CHKRDYMTCAN_VAR MTCAN_SETSZMTCAN_SILIMTCAN_SEEKMTCAN_COMPRESS,

/* minimum delay on i/o is 4 minutes, because when a retry is

* performed, the drive retries a number of times, and then

* rewinds to BOT, repositions, and tries again. */ 40, 4*60, 4*60, 5*60, 3*3600, 512, 512*512, tpsc_default_dens_count, tpsc_default_hwg_dens_names, tpsc_default_alias_dens_names,

{0}, 0, 0, 0,

0, (u_char *)0 },

For an explanation of the functions of the MTCAN values and constants, see "MTCAN and Constants Values".

3Recompile the kernel by running autoconfig and then reboot the system. When you reboot, the device files for the DLT1 drive will be created automatically.

The following device files will be created in /dev/rmt:

tps0d3	tps0d3cnrv	tps0d3nrns	tps0d3s
tps0d3c	tps0d3cns	tps0d3nrnsv	tps0d3sv
tps0d3cnr	tps0d3cnsv	tps0d3nrs	tps0d3v
tps0d3cnrns	tps0d3cs	tps0d3nrsv	tps0d3stat
tps0d3cnrnsv	tps0d3csv	tps0d3nrv
tps0d3cnrs	tps0d3cv	tps0d3ns
tps0d3cnrsv	tps0d3nr	tps0d3nsv

These device file names can be interpreted as follows:

Device Name	Function
c	Compression
nr	No rewind on close
v	Device supports variable block sizes
ns	Device does not byte-swap
s	Device does byte-swap
stat	Allows the device to be used when one of the other device
	files specifying the same physical device is already opened

For example, the device file tps0d3 indicates a device on controller card 0 at SCSI ID 3, and the device file tps0d3nrv indicates a device on controller card 0 at SCSI ID 3 that does not rewind on close and supports variable block sizes.

Once the device files have been created, you should confirm that your new tape drive is working properly. See Verifying Installation.

MTCAN and constants values

The MTCAN values have the following functions:

	MTCAN	Capability Enabled
	value	Capability Enabled
	value
	APPEND	Append to existing tape data
	BSF	Backspace file
	BSR	Backspace record
	CHKRDY	Determine if a tape cartridge is present

CHTYPEANY Change density and/or fixed to variable at points other than beginning of tape

COMPRESS Compression

PREV	Prevent media removal
SEEK	Seek to a particular block
SETSZ	Fixed block size can be set
SILI	Suppress illegal length indicators
SPEOD	Space to EOD (end of data)
SYNC	Synchronous mode SCSI
VAR	Variable block sizes
The constants have the following functions:
Constant	Description
40	Transfer time-out in "inverse ticks"
4*60	Minimum time-out in seconds for any command
4*60	Space command time-out in seconds
5*60	Time-out in seconds for long operations (such as rewinds)
512	Default block size in bytes for fixed block size mode
64*512 or	Recommended blocking factor in bytes for the upper limit of
512*512	read/write commands

file:///C/Documents%20and%20Settings/topher.COL-SPRINGS/Desktop/manual/document/dlt1/user/reseller/eng/c_silcon.htm [12/3/2001 7:50:53 AM]

HP Tape manual Silicon Graphics systems, Irix, Mtcan and constants values

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