VA7410 Alternate Paths

[Bob Ferro]

Then how can I relate every LUN to a hardware path/device file? If I have 60 LUNs (30 rg1 and 30 rg2), and I do an ioscan -fnCdisk and I see 60 /dev/dsk/c10txdx and 60 /dev/dsk/c12txdx, which one is which? According to man vgcreate, the 1st pv-path is primary and the 2nd pv-path is secondary. If I have more than one LUN assigned, is it vgcreate vg01 pp sp pp sp, etc or vgcreate vg01 pp sp sp pp, etc?

[Bob Ferro]

One thing to add, I have 2 Dual-Port 4 Gig FC HBA, one FC from HBA 1 to controller 1 and one FC from HBA 2 to controller 2. Dah, I had a senior moment.

[Torsten.]

Try this, maybe it helps you to get more info:

# armtopology

[Bob Ferro]

Here's the results:

phl1s425 50060b00006a3411 50060b00006a3410 A6218A 00SG229J0018 2 2 0 phl1s425.dscp.dla.mi /dev/dsk/c12t0d0

[Torsten.]

>>
phl1s425 50060b00006a3411 50060b00006a3410 A6218A 00SG229J0018 2 2 0 phl1s425.dscp.dla.mi /dev/dsk/c12t0d0

Do you think I always know what all this means? VA is an old array - long time ago...

But after some research ...

C_RG_LUN___Device Path
2_2___0____/dev/dsk/c12t0d0


If this is correct, your RG 2 is related to c12...

[TTr]

armdsp -a and ioscan -fnk can straighten this thing out.

If you look in armdsp output under the "CONTROLLERS" section you will see controller M/C1 and M/C2. Under each controller look for the hardware path line

Lets say M/C1 is
Hardware Path:_________0/12/0/0.8.0.108.0.0.0

and M/C2 is
Hardware Path:_________0/10/0/0.8.0.110.0.0.0

Further down in the LUN sections you will see the Redundancy group for each LUN. It is either 1 or 2 for M/C1 and M/C2. You will need this for each LUN. It is usually odd/even as you mentioned.

Then you look in the ioscan listing and identify both hardware paths for each LUN. One LUN path will start with 0/12/0/0... and the other 0/10/0/0... Each of these paths will have a hardware device associated with it. Let say c12 is for the 0/12 and c10 for the 0/0.

For the LUNs that belong to RG1 use c12tXdY as the primary and c10tXdY as the alternate path in vgcreate. For the LUNs that belong to RG2 use c10tXDY as the primary and C12tXdY as the alternate.

[Bob Ferro]

Hey guys, thanks for all the info. I had one path down, I had to do an armdiscover and now everything shows as 2 paths.