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MSA1000 Active/Standby with Integrated 2/8 Switches

 
Occasional Contributor

MSA1000 Active/Standby with Integrated 2/8 Switches

HP customer has a dual-controller MSA1000 running firmware 5.20 active/standby, with two 2/8 FC switches integrated into the rear of the MSA chassis. I have researched many sites and can't find definitive answer to my inquiry about how data flows inside the MSA1000.

Each MSA controller has a 2/8 SANswitch directly behind it. For example, if controller#1 (right-side when viewed from front) is active and controller#2 is standby, can any I/O flow through the SANswitch behind standby controller#2? That is, does each integrated SANswitch (or single-port I/O module for that matter) only serve the controller directly in front of it? Or, does I/O pass through both integrated switches no matter which controller is active?
4 REPLIES 4
Acclaimed Contributor

Re: MSA1000 Active/Standby with Integrated 2/8 Switches

does each integrated SANswitch (or single-port I/O module for that matter) only serve the controller directly in front of it?

Yes.

Hope this helps!
Regards
Torsten.

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Occasional Contributor

Re: MSA1000 Active/Standby with Integrated 2/8 Switches

Thank you for your reply. Perhaps you can make some sense out of the continuing strange behavior of this MSA1000 (see first post in this thread for configuartion description).

Both controllers are running firmware 5.20, which MSA documentation says is active/stand-by firmware. But the front panel (LEDs and display) and the CLI output disagree about the current role of each controller. The active/stand-by LED (top row, seventh from left or second from the right) is on steadily on BOTH controllers all the time. The display may show both controllers "redundancy active, active controller" at the same time. How can they both be active if they are running firmware 5.20?

At the same time the CLI (connected serially to either controller) shows one controller active and one controller standby. However, run the "show this" and "show other" commands a few minutes later and both controllers are reported as standby, even though I/O is continuing to servers.

Interestingly, the "show this" and "show other" is as follows:
"Supported Redundancy Mode: Active/Standby Asymetrical Active/Active
Current Redundancy Mode: Active/Standby (emulated)
Current Role: Standby"

Is 5.20 really active/standby? What is this asymetrical active/active? Is that why both active LEDs are on?
Occasional Contributor

Re: MSA1000 Active/Standby with Integrated 2/8 Switches

Addition to my most recent post - forgot to mention that both controllers have been replaced (one at a time), and the wierd behavior did not change.
Honored Contributor

Re: MSA1000 Active/Standby with Integrated 2/8 Switches

It is some kind of "unfinished active/active":

http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1119872

John used to work on the MSA1000 / MSA1500cs.
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