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Dasdid 600 isp2d020 has 2 paths
P1: isp2d020 status(3) UP ACTIVE
P2: isp4d000 status(1) UP
Dasdid 700 isp2d021 has 2 paths
P1: isp2d021 status(3) UP ACTIVE
P2: isp4d001 status(1) UP 

The break down of this data can be done as below:

isp X d YY Z
-  -- -
|    | |
|    | +-- LUN Number
|    |
|    +---- Host ports on RAID array controller modules. There are four host ports numbered 0 to 3 from left to right (internally). The controller port is physically numbered 1  2   1  2.
|
+--------- Port on HBA, these are numbered as shown in diagram.

The cases below describe the two recommended configuration with SE5310 and how HBA ports are numbered.

Case 1:

HBA Port numbering SE5310 with 2 Dual ported HBAs we get the numbering as below:

               (Top)
+-------------------+
| '''''   '''''     |
| | 4 |   | 3 |     | ----> Dual ported HBA in upper PCI slot
| '''''   '''''     |
(Left) +-------------------+ (Right)
| '''''   '''''     |
| | 2 |   | 1 |     | ----> Dual ported HBA in Lower PCI slot
| '''''   '''''     |
+-------------------+
|                   |
|                   |
|                   |
+-------------------+
(Bottom)

Case 2:

HBA Port numbering, SE5310 with 1 Dual ported HBAm the numbering is described below.
(Top)
+-------------------+

       | '''''   '''''     |
(Left) | | 2 |   | 1 |     | (Right)
| '''''   '''''     | ----> Single Dual ported HBA
+-------------------+
|                   |
|                   |
|                   |
+-------------------+
|                   |
|                   |
|                   |
+-------------------+
(Bottom)

RAID expansion unit port numbering
+------------------------------------+
| ''''''  ''''''  |  ''''''  ''''''  |
(Left) | | 00 |  | 01 |  |  | 02 |  | 03 |  | (Right)
| ''''''  ''''''  |  ''''''  ''''''  |
|    Module A     |     Module B     |
+------------------------------------+

Note: The physical host port numbering  marked on the back of
the array is  1  2  1  2 . The internal host port
numbering and the physical host port numbering do not match
(hardware manufacturing and software engineering snafu).

Now for first LUN - isp2d020 there are two paths

      1. isp2d020 which is
UP - Path is online
ACTIVE - and is being accessed by this path

Path breakdown with 2 Dual ported HBAs:

         isp2d020 --- Left hand side port of lower HBA --> connected to host port 02 on RAID expansion unit --> LUN 0

      2. isp4d000 which is
UP - Path is online but LUN is not being accessed by this path.

Path breakdown with 2 Dual ported HBAs:

         isp4d000 --- Left hand side port of upper HBA --> connected to host port 00 on RAID expansion unit --> LUN 0

Similary for LUN 2:

      1. isp2d021 which is
UP - Path is online
ACTIVE - and is being accessed by this path

Path breakdown with 2 Dual ported HBAs:

         isp2d021 --- Left hand side port of lower HBA --> connected to host port 02 on RAID expansion unit --> LUN 1

      2. isp4d001 which is
UP - Path is online but LUN is not being accessed by this path.

Path breakdown with 2 Dual ported HBAs:

         isp4d001 --- Left hand side port of upper HBA --> connected to host port 00 on RAID expansion unit --> LUN 1

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