2013-02-16 04:10 PM
I am getting "Stack Same path" warning when running Config Advisor. This is because of the connectivity of the primary and redundant path on four stack of FC shelves look like this:
I guess what this means, is if the module (example IOM on port 1 where 1d and 1c) breaks, then I lose the entire stack, am I right? potential loss of data? especially since we are using software base ownership (disk assign)
I plan to recable them, but I want to learn more, but I plan to recable them like these:
What will be the best approach on recabling them? Total shutdown? anything else need to be done on the OS level?
2013-02-16 06:45 PM
Keep in mind that most cards (including the onboard ports) have one ASIC chip for two ports, you shouldn't use A&B or C&B ports from the same card on one controller.
You might find easier to cable them using same port such on two different cards, for example 1a/3a, 4a/11a partner could be 1b/3b, 4b/11b. You have a lot of choices.
2013-02-18 06:47 PM
You are looking for the A&B modules of the disk shelf. I don't understand what you mean by C&B.
PRIMARY PORT SECONDARY PORT SHELF BAY
-------- ---- --------- ---- ---------
4a.24.0 B 3a.24.0 A 24 0
4a.24.1 B 3a.24.1 A 24 1
4a.24.2 B 3a.24.2 A 24 2
In this example B module is the primary and A is the secondary.
2013-02-18 06:55 PM
I was just responding to your statement
"you shouldn't use A&B or C&B ports from the same card on one controller.You might find easier to cable them using same port such on two different cards, for example 1a/3a, 4a/11a partner could be 1b/3b, 4b/11b".
I understand the part where you say that I should use port a on different cards. I thought you were saying that I should not use port 'a' on one card, then port 'c' on another card.
2013-02-18 07:32 PM
thanks for clarifying. I heard that advise somewhere also but not so sure the reason behind it.
If I change the redundanth path, will I need to do anything else or will it be auto-detected without interruption.
2013-02-19 05:45 AM
Once you verify MPHA you should be able to move cables without down time. Do it slowly, one cable at a time then make sure everything is working before moving another cable, storage show disk -p before each move.