Seagate ST11200N Technical Information PDF herunterladen (Seite 57)

Configuring Tape Drives

3. Create the desired device files by using the following command:

mkdev -c tape -t ost -s scsi -p scsi0 -w 5,0

4. Display the device files by issuing the following lsdev command:

/usr/sbin/lsdev -C -s scsi

hdisk0 Available 00-01-00-0,0 400 MB SCSI Disk Drive

hdisk1 Available 00-01-00-1,0 400 MB SCSI Disk Drive

rmt0 Available 00-01-00-3,0 Other SCSI Tape Drive

rmt1 Available 00-01-00-5,0 Other SCSI Tape Drive

5. To ensure that the tape device is configured for variable-mode and extended file

marks, use the following commands:

chdev -l rmt1 -a block_size=0

chdev -l rmt1 -a extfm=yes

Enter the following device file path to configure the 8-mm drive connected to

controller 1 and SCSI ID 5:

/dev/rmt1.1

Using Multiple Tape Densities

After creating the necessary device files for your tape drives you may want to use

non-default densities on drives that support them (for example, Exabyte 8500C tape

drives).

There are two configurable densities available for all tape drives, although not all tape

drives support multiple densities. The default density for both density setting 1 and

density setting 2 is 0, which means maximum density.

To modify either of the density settings, you can use smit(1) or commands similar to the

following:

chdev -l

tapedev

-a density_set_1=

Density

chdev -l

tapedev

-a density_set_2=

Density

Where:

◆ tapedev is the logical identifier for the drive, such as rmt0 or rmt1.

◆ Density is the decimal number representing the desired density.

Chapter 3, IBM AIX 43

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Seagate ST11200N Technical Information Seite 57