Interpreting Disk Hardware Path (82 Views)
Reply
Occasional Advisor
Telefonica OSI
Posts: 15
Registered: ‎09-30-1997
Message 1 of 3 (82 Views)

Interpreting Disk Hardware Path

[ Edited ]

Reading the HP Fibre Channel Mass Storage Adapters Manual, on the subject related to intrepretint the disk hardware path in private loop topology, when it goes down to the target or lun, it talks about " The value of bits x-x of the 14-bit volume number for an array device using the volume set addressing method".
Anybody knows how to translate that 14-bit volume number from the xpinfo or inqSym utilities output?

 

 

P.S. This thread has been moved from Network Attached Storage (NAS) (Enterprise) to HP-UX > sysadmin - HP Forums moderator

Please use plain text.
Honored Contributor
Eugeny Brychkov
Posts: 3,296
Registered: ‎03-14-2002
Message 2 of 3 (82 Views)

Re: Interpreting Disk Hardware Path

Javier,
in ioscan output last 3 fields are usually defined as bus, target and LUN. In volume set addressing mode, all these 3 fields used in non-usual way, and indicate Storage Array LUN number.
bus = 7 bits
target = 4 bits
LUN = 3 bits
real disk array's LUN number will be (consisting of 7+4+3=14 bits):
LUN+taget*8+bus*128
Eugeny
Please use plain text.
Honored Contributor
Bill McNAMARA_1
Posts: 3,866
Registered: ‎11-14-2000
Message 3 of 3 (82 Views)

Re: Interpreting Disk Hardware Path

you'll see an explaination in this link:
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x48691012aa92d5118ff10090279cd0f9,00.html

and also:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x869de7e60861d511abcd0090277a778c,00.html

for examples of Volume Set Addressing /SCSI protocol limitations on device file construct.


Good Luck
It works for me (tm)
Please use plain text.
The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation