Technical data

6.9.1.4 Displaying the Available Boot Devices
The only Fibre Channel devices that are displayed by the console show dev
command are those devices that have been assigned to a wwidn environment
variable with the wwidmgr -quickset command.
The devices that are shown in the reachability display of Example 6–5
are available for booting and the setting of the bootdef_dev console
environment variable during normal console mode.
If you execute the show wwid* console command now, it will show that
the environment variable wwidn is set for two disks. Also, the show n*
command shows that the units are accessible through four HSG80 N_Ports
as follows:
P00>>> show wwid*
wwid0 133 1 WWID:01000010:6000-1fe1-0000-0d60-0009-8080-0434-002e
wwid1 131 1 WWID:01000010:6000-1fe1-0000-0d60-0009-8080-0434-002f
wwid2
wwid3
P00>>> show n*
N1 50001fe100000d64
N2 50001fe100000d62
N3 50001fe100000d63
N4 50001fe100000d61
_____________________ Caution _____________________
If you reuse a UDID, ensure that you clear the wwidn console
environment variable set for the original storage unit. If you do
not clear the wwidn console environment variable, the wwidmgr
command used to quickset the UDID the second time sets a
second wwidn console environment variable for the same UDID.
The original wwidn console environment variable has a lower
number, and therefore is the console environment variable that
will be used, but it points to a storage unit that is not reachable.
Therefore, you will not be able to boot the system.
If you have already used the wwidmgr -quickset command
the second time on the UDID and set a second wwidn console
environment variable for the same UDID, and the system has
failed to boot, use the wwidmgr command to clear the wwidn
console environment variable for the unreachable storage unit.
For example, consider the following state of the wwidn console
environment variables where wwid1 and wwid2 are both for UDID
150, and wwid1 is the original console environment variable:
P00>>> show wwid*
wwid0 5 1 WWID:01000010:6000-1fe1-0006-3f10-0009-0270-0619-0006
wwid1 150 1 WWID:01000010:6000-1fe1-0006-3f10-0009-0270-0619-000d
wwid2 150 1 WWID:01000010:6000-1fe1-0006-3f10-0009-0270-0619-0011
wwid3
6–66 Using Fibre Channel Storage