Technical data

1 The number within the brackets ([ ]) is the item number of the
device shown on any particular line.
2 The UDID is assigned at the HSG80 with the set Dn IDENTIFIER
= xxx command, and is not used by the Tru64 UNIX operating
system, but may be set (as we have done with the SET D131
IDENTIFIER=131 group of commands). When the identifier is not
set at the HSG80, a value of -1 is displayed.
3 The worldwide name for the device. It is prefixed with the value
WWID:01000010:. The most significant 64 bits of the worldwide
name resembles the HSG80 worldwide name, and is assigned when
the unit is manufactured. The least significant 64 bits is a volume
serial number generated by the HSG80. You can use the HSG80
SHOW unit command to determine the worldwide name for each
storage unit (as shown in Example 6–2).
4 The console environment variable set for this worldwide name.
Only 4 wwidn console environment variables (wwid0, wwid1,
wwid2, and wwid3) can be set. The console show dev command
only shows those disk devices for which a wwidn console
environment variable has been set using the wwidmgr -quickset
or wwidmgr -set command. In this example, none of the wwidn
environment variables is set.
4. Look through the wwidmgr -show wwid display (Example 6–4) and
locate the UDID for the Tru64 UNIX disk (133) and each member
system boot disks (131, 132) to ensure the storage unit is seen. As a
second check, compare the worldwide name values.
5. Use the wwidmgr command with the -quickset option to set a device
unit number for the Tru64 UNIX Version 5.1A installation disk and the
first cluster member system boot disk.
Example 6–5 shows the use of the wwidmgr command with the
-quickset option to define a device unit number, based on the UDID,
as an alias for the worldwide name for the Tru64 UNIX installation
disk and the first cluster member system boot disk. The wwidmgr
-quickset utility sets the device unit number and also provides a
display of the device names and how the disk is reachable (reachability
display).
The wwidmgr -quickset command generates multiple device unit
numbers based on the UDID. The device unit number is an alias for the
worldwide name, in a format the console can use to identify the storage
unit. The wwidmgr -quickset command may generate multiple
device names for a given device unit number because each possible path
to a storage unit is given its own device name.
Using Fibre Channel Storage 6–63