Decoding HDS LUN presented to Linux

WORK IN PROGRESS - the more rocks I overturn, the more data I find that I am missing :-(

I'm gathering information from a number of sources and I have not found a source that covers this entire topic.  You can find additional information elsewhere, if you need more detailed info.
I anticipate this post will contain quite a bit of data at some point.

This... is an example of the multipath device you would see from Red Hat.  Notice it is similar to your standard WWN, but not absolutely the same.


# multipath -ll -v2 | tail -5
360060e800571c900000071c9000005f7 dm-5 HITACHI,OPEN-V
size=200G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 5:0:0:0 sdb 8:16  active ready running
  `- 6:0:0:0 sdh 8:112 active ready running

Let's break this down.

36 0060e8 00 5 71c9 00 000071c9000005f7
36 - Vendor Code (For some reason this is NOT 50, as expected)
0060e8 - HDS OUI
00
5 - Front End Port (FEP) - in this case 'F'
71c9 - HDS Array Serial Number (in Hex)

http://en.wikipedia.org/wiki/World_Wide_Name

500060E8WWXXXXYZ

50

the first 4 bits from the WWN are 0101 (5 hex), and show which is the organization responsible for the name assignment (NAA). 5 means - (format 5 of NAA) means that the Vendor (e.g. Hitachi) is responsible for uniquely use the whole address.

0060E8

next in the WWN is the unique ID of the Vendor. It is assigned by ieee to different organizations. Each vendor has unique ID, and some vendors may have more than than one ID. On web address http://standards.ieee.org/regauth/oui/index.shtml you may check them. For 0060e8 you will find
HITACHI COMPUTER PRODUCTS (AMERICA), INC.
3101 TASMAN DRIVE
SANTA CLARA CA 95054
UNITED STATES

From here on is the interesting part. VSID - Vendor Specific ID

WW

is the family of the hardware. If it’s “01″ then it’s a 7700/”Thunder”. “02″ is a 9900/”Lightning”.

XXXX

is the serial number. It’s a hex value, convert it to decimal and that’s the box serial number.

Y

is the cluster. 0=Cluster 1 (Left hand side) and 1=Cluster 2 (Right hand side).

Z

is the port. Note there is no Port I. Use this table:

0A

1B

2C

3D

4E

5F

6G

7H

8J

9K
AL
BM
CN
DO
EP
FQ

WW value - model	HP model
01	XP 256
02	XP 512/48
03	XP1024/128
04	XP12000/10000
??	XP24000

HP XP Port WWN = 50:00:60:E8:01:12:34:0A
0A - CHIP Port
0 - means 1
A - means L (see table)

Description	WWN	Serial	model	CHIP
XP 12000, disk system 5004, FRHA043981	50:06:0e:80:04:ab:cd:00	hex: abcd dec: 43981	04 => XP12000	1A
XP 12000, disk system 5005, FRHA012345	50:06:0e:80:04:30:39:04	hex: 3039 dec: 12345	04 => XP12000	1D

example 1:

12:34 - Serial#

example 2

This information was retrieved from http://brionetka.com/linux/?p=38 and I am certain that person put quite a bit of effort into documenting this information and deserves credit.