UNIX Configuration Guide:
Silicon Graphics IRIX

Configuration Switch Settings

Autoloader Switch Settings

Installation Procedure for IRIX

MTCAN and Constants Values

Configuration Switch Settings

The configuration settings for an HP SureStore DAT drive installed on a Silicon Graphics system should be as follows:
 

With these switch settings, SCSI parity checking is turned off. Setting switch 8 to OFF will disable MRS.

Silicon Graphics DMA hardware requires a 32-bit aligned address. HP DDS drives limit disconnects to a 16-bit alignment. For this reason, this switch setting disables the data phase disconnect. You should also keep block transfers short, as described in the installation procedure below.

HP SureStore DAT24x6 Autoloader Option Switch Settings

The HP SureStore DAT24x6e autoloader has an additional selector switch on the rear panel. This switch sets different configurations for the autoloader mechanism and are read by the firmware at power-on. For an IRIX system, this switch should be set to 7 (the default value), which sets the internal switches as follows:

Note: Set the value with the autoloader switched off.

For a more detailed explanation, please see Autoloader Option Switch.

Installation Procedure for IRIX

1. Select 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 5.1 or earlier, this file is /usr/sysgen/master.d/tpsc
• For IRIX 5.2, this file is: /usr/sysgen/master.d/scsi
• For IRIX 5.3, this file is: /var/sysgen/master.d/scsi
• For IRIX 6.2, this file is: /var/sysgen/master.d/scsi

2. Find 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 5.x:

{DATTAPE,TPDAT,7,6,"ARCHIVE","Python",0,0,{0, 0, 0, 0}, MTCAN_BSF|MTCAN_BSR|MTCAN_APPEND|MTCAN_SETMK|MTCAN_PART| MTCAN_PREV|MTCAN_SYNC|MTCAN_SPEOD|MTCAN_CHKRDY|MTCAN_VAR| MTCAN_SETSZ|MTCAN_SILI|MTCAN_AUDIO|MTCAN_SEEK|MTCAN_CHTYPEANY, /*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*60,512,512*512},


For IRIX 6.2:

{DATTAPE,TPDAT,2,6,"HP","C1557A",0,0,{0},
MTCAN_BSF|MTCAN_BSR|MTCAN_APPEND|MTCAN_SETMK|MTCAN_PART|
MTCAN_PREV|MTCAN_SYNC|MTCAN_SPEOD|MTCAN_CHKRDY|MTCAN_VAR|
MTCAN_SETSZ|MTCAN_SILI|MTCAN_SEEK|MTCAN_CHTYPEANY|MTCAN_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 },


An explanation of the functions of the MTCAN values and constants is given in the MTCAN and Constants Values section.

3. Edit the first line of the entry to suit your tape drive by making the changes shown in bold.

• For an HP SureStore Tape 5000 drive, change the first line to read:

  {DATTAPE,TPDAT,2,8,"HP","HP35480A",0,0,{0,0,0,0}, 

• For an HP SureStore DAT8 drive, change the first line to read:

  {DATTAPE,TPDAT,2,6,"HP","C1533A",0,0,{0,0,0,0},

• For an HP SureStore DAT24 drive, change the first line to read:

  {DATTAPE,TPDAT,2,6,"HP","C1537A",0,0,{0,0,0,0}, 

• For an HP SureStore DAT24x6e autoloader, change the first line to read:

  {DATTAPE,TPDAT,2,6,"HP","C1557A",0,0,{0,0,0,0}, 
  

4. Remove MTCAN_AUDIO from the fourth line of the entry.

5. Change the blocking factor from 512*512 to 64*512, (64 KB blocks) on the last line of the entry. This will keep data transfers short and avoid tying up the bus.

6. Once you have made your changes, recompile the kernel by running autoconfig and then reboot the system. When you reboot, the device files for the DAT drive will be created automatically.

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

These device file names can be interpreted as follows:

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.

Note: Some versions of IRIX 6.x (depending on how the OS was installed and which patches are installed) may not create the compression device files using the procedure above. If this is the case:

1. Locate the file /dev/MAKEDEV.d/TPS_base.

2. After the line starting *Device:*Python*, add the following new entry:

   *Device:*HP*C15*)               # HP DDS with DC
   mdev=`expr $mdev + 8`;
   mknod ${prf}$1c c ${C_TPS} $mdev;
   ;;

Note that this is only applicable for DAT8 (C1533A), DAT24 (C1537A), and DAT24x6 (C1557A) models. For a Tape 5000 drive, replace *HP*C15* with HP35480A as the device identifier.

3. For IRIX 6.2 only, the entry should end with:

   0, (u_char *)0 },

MTCAN and Constants Values

The MTCAN values have the following functions:

The constants have the following functions: