You are going to be using the "storage adapter" command to disable and re-enable all the adapters.

If you want to do this live, you have to be careful of the four paths.

For instance, if your multipath paths are:

Node 1
0a/1c

Node 2
0a/1c

I would do something like this:

Node 1> storage adapter disable 0a
Node 2> storage adapter disable 0a (provided it the same path as node1)
--> basically, we want to shut down the entire path from both heads
--> i.e. shelf 1 top ESH4 module and shelf 2 top ESH module

--> re-cable the link attached to 0a including the new shelves, daisy-chaining as needed.

Node 1> storage adapter enable 0a
Node 2> storage adapter enable 0a

The system should pick up the new disks and will complain about not being multipath-HA

Repeat the process for the other path.
Node 1> storage adapter disable 1c
Node 2> storage adapter disable 1c (provided it the same path as node1)
--> i.e. shelf 1 bottom ESH4 module and shelf 2 bottom ESH module

--> re-cable the link attached to 1c including the new shelves, daisy-chaining as needed.

The system should pick up the new disk paths and should verify multipath-ha

not sure this is supported, but in my head it should work ;)

--tmac

Tim McCarthy
Principal Consultant


          

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On Tue, May 21, 2013 at 7:34 PM, Fletcher Cocquyt <fcocquyt@stanford.edu> wrote:
This is something I've never had reason to attempt until now.

We have a 3270 cluster (8.1.2) 
Head 2 aggr1 consists of these two multipathed DS14MK4 trays (IDs 1,2):


We want to hot add another DS14MK4 trays racked right above (IDs 3,4):


I've read the 2011 DS14MK4 guide and verified the loop speeds are all set consistently and IDs are all unique.
(note: trays IDs are 1-4 from bottom to top)

Can I simply:

1 -  remove the top two pairs of fiber and transceivers (these go to head 1 (partner))
2 - daisy chain up from those vacated ports to new trays (3,4)
3 - plug the fiber and tranceivers back in on the top tray?

We would then grow (effectively double) this aggr1's capacity

What are the risks ? (2011 guide mentions panic's are possible with loop misconfig)

(we have 60 VMs running on head 2 on a separate loop and aggregate)

Any other tips appreciated

thanks


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