User`s guide

The device activity indicator (green light) will illuminate on the device. If the
unit is a multidevice container, only one of the devices from that container
illuminates. The DEC OSF/1 operating system should display something like the
following output after the command is entered:
/dev/rrzb17a character special (8/mmmm) SCSI # n HSZ40 disk #xxx (SCSI ID #t)
8 is the major number
mmmm is the minor number
n is the SCSI host side bus number
t is the target ID as used in the HSZ40 unit DTZL
T in the DTZL HSZ40 unit matches the "t" from the file command
xxx is the Disk Number discussed in a previous section
If an error occurs, such as:
file: Cannot get file status on /dev/mmmm
/dev/mmmm: cannot open for reading
This error usually indicates that the device special
file that matches "mmmm" does not exist in the /dev directory.
If the only output that is returned from the file command is the major and minor
number, then either the device is not answering or the device special file does
not have the correct minor number. Check the minor number to be sure that it
matches the correct SCSI host side bus number and the correct HSZ40 target ID
and LUN from the HSZ40 unit designator.
If an error occurs regarding the disk label, there is good probability that the
device can be accessed. The device activity indicator illuminate. This error can
usually be fixed by creating the disk label through the use of the DEC OSF/1
disklabel utility. However, be sure that the user is aware of the proper use of the
disklabel utility. Only, a well-informed system manager should use this utility.
8.16 SCU Utility
This section discusses the SCSI CAM Utility program. It is located in the /sbin
directory. It is documented in the REF Pages.
This utility can be used to see what HSZ40 units are available to the DEC OSF/1
operating system, for example:
/sbin/scu -f /dev/mmmm
The mmmm represents the Character Mode special file
name associated with an HSZ40 unit.
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/sbin/scu -f /dev/rrza16a
SCU> Show Nexus
This SCU command gives you SCSI bus information in the following
format:
Device Nexus: Bus: n
Target: t
Lun: L
Device Type - direct access
(In this example the device type for a disk is direct access.)
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Operating System Support 8–39