hw_path to fibre disks

[Jeremy Henry]

I've got an N-class hooked to Hitachi 9910 luns through a fabric and HP-UX doesn't see the disks. I'm running 11.11 with an A5158A HBA and patch PHKL_27751. Here's the error:

td: claimed Tachyon TL/TS Fibre Channel Mass Storage card at 0/2/0/0
td_create_domain_node: hw_path = For backward compatability domain 8 is not allowed. Configure the switch to assign a domain value other than 8. Domains > 8 will not be recognized till this problem is fixed.

Trouble is, the switch doesn't have a domain id of 8. If tried other switches with different domain ids with the same result. Any ideas?

TIA,
-Jeremy

[Eugeny Brychkov · Accepted solution]

Jeremy,
8 is identifier of private loop and can not be used for switch domain id. Please check if ALL switches in the SAN have domain ids different than 8.
Which switches do you have?
If this environment is not in production you can try to break SAN and connect devices one-by-one and check if driver will display this error. After you'll locate last device after connecting it you'll get error then we'll troubleshoot futher
Eugeny

[Steven E. Protter]

On some non-hp disk arrays the maximum number of luns is 8.

That is a limitation that was supposed to be fixed with a fibre driver patch a year or so ago, but is still not available for some cards.

Steve

LUN numbers start with 0 so onlky 0-7 will be recognized by the card.

[Eugeny Brychkov]

hpux hardware address looks like
hwpath.domain_id.port_id.alpa_or_mode.bus.target.LUN
and can be
0/2/0/0.8.0.255.1.2.0
Here 8 is domain_id, and this '8' is used to indicate that device is connected into private loop. So the rule is that none of switches can have domain_id=8 because it will conflict with private loop identification mechanism. For example:
0/2/0/0.3.4.255.1.2.0
This device is connected to switch with domain_id=3, port 4 (possible it's brocade 3x00 switch), direct connect (target addressing mode) and alpa=17.... just an exampe
Eugeny

[Jeremy Henry]

Thanks Eugeny, that was the problem. One of the switches in the fabric had a domain id of 8. Once we changed that, all the luns show up.