17.4 Listing Installed Devices | HP Certified: HP-UX System Administration

The device files associated with the installed devices can be listed using one of the ll , ioscan , or lssf commands. Each of these commands lists particular characteristics of device files.

Using the ll Command

Consider this list of files displayed by the ll command.

 $  ll /dev/rmt/0m*  crw-rw-rw- 2 bin bin  212 0x030000 Oct 28 1997 /dev/rmt/0m crw-rw-rw- 2 bin bin  212 0x030080 Sep 29 1997 /dev/rmt/0mb crw-rw-rw- 2 bin bin  212 0x030040 Sep 29 1997 /dev/rmt/0mn crw-rw-rw- 2 bin bin  212 0x0300c0 Sep 29 1997 /dev/rmt/0mnb $

The ll command lists the following features of a device file.

Type of the file. If the first character of an output line is "c", it is a character or raw device file. If the first character is "b", it is a block-type file.
The major number of the device file in field 5, which is 212 in this listing.
The minor number of the file in field 6.

Using the ioscan Command

The ioscan command has an advantage over the ll command in that it shows which device is attached to which file. It can also be used to list device files related to a particular class of devices. Output of the ioscan -funC disk command is shown here, which displays a list of all device files linked to class disk .

 #  ioscan -funC disk  Class  I  H/W Path  Driver S/W State H/W Type  Description =========================================================== disk  16  10/0.1.0  sdisk  CLAIMED   DEVICE    SEAGATE   ST34371W            /dev/dsk/c2t1d0   /dev/rdsk/c2t1d0 disk  17  10/0.2.0  sdisk  CLAIMED   DEVICE    SEAGATE   ST34572WC           /dev/dsk/c2t2d0   /dev/rdsk/c2t2d0 disk  18  10/0.3.0  sdisk  CLAIMED   DEVICE    SEAGATE   ST34371W            /dev/dsk/c2t3d0   /dev/rdsk/c2t3d0 disk  19  10/0.4.0  sdisk  CLAIMED   DEVICE    SEAGATE   ST34371W            /dev/dsk/c2t4d0   /dev/rdsk/c2t4d0 disk  20  10/0.5.0  sdisk  CLAIMED   DEVICE    SEAGATE   ST15150W            /dev/dsk/c2t5d0   /dev/rdsk/c2t5d0 disk  21  10/0.6.0  sdisk  CLAIMED   DEVICE    SEAGATE   ST15150W            /dev/dsk/c2t6d0   /dev/rdsk/c2t6d0 disk  22  10/5.2.0  sdisk  CLAIMED   DEVICE    TOSHIBA CD-   ROM XM-5401TA       /dev/dsk/c3t2d0   /dev/rdsk/c3t2d0

Note that CD-ROM is also included in the "disk" class of devices. Similarly, to list all tape devices, you can use the ioscan -funC tape command. The ioscan command lists the following device file characteristics.

Device class. If you use ioscan without any class option, it lists all devices attached to the system. From the first column of the output, you can find which device is related to which class.
Instance number of the device.
Hardware path of the device.
Kernel driver used for the device.
S/W state that shows whether the device driver is attached to the device.
Description field that shows what type of device it is.

Using the lssf Command

You have seen that more than one file is attached to a tape device. The lssf command shows the characteristics of each device file. Consider the output of the following command.

 $  lssf /dev/rmt/c4t1d0BESTn  stape card instance 4 SCSI target 1 SCSI LUN 0 at&t no    rewind best density available at address 10/8.1.0 /dev/   rmt/c4t1d0BESTn $

This output shows additional information that ioscan does not provide. Specifically it shows that:

The tape device file uses AT&T-style tape behavior.
It will not rewind automatically.
It will use the best density available for writing data.

Usable Devices

The ioscan command with the -u option shows only usable devices. The usable devices have the software driver bound to the device.

Study Break

Listing and Naming Device Files

You have seen that a particular naming convention is used with devices attached to an SCSI interface. Use the command ioscan -funC lan to list all network interfaces attached to the system and see if there is any particular naming convention. The lssf command shows additional features of a device file. Go to the /dev/rmt directory where tape device files are stored. Use the lssf command on all of these files and see what characteristics each file has. Consult Table 17-2 to compare these characteristics with the device name .

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