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09-02-2009 12:41 PM
09-02-2009 12:41 PM
MSA1000 Active/Standby Configuration with Two Integrated SANswitches
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?
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09-03-2009 02:18 AM
09-03-2009 02:18 AM
Re: MSA1000 Active/Standby Configuration with Two Integrated SANswitches
At any given moment, there's traffic only through one switch and one controller. If something fails on the path between the server and the MSA, the multipath software changes to the other path (other HBA port, other SAN switch, other MSA controller).
The active MSA controller is indicated by the 7th LED on the top row of LEDs.
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09-08-2009 07:56 AM
09-08-2009 07:56 AM
Re: MSA1000 Active/Standby Configuration with Two Integrated SANswitches
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?
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09-08-2009 08:41 AM
09-08-2009 08:41 AM
Re: MSA1000 Active/Standby Configuration with Two Integrated SANswitches
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09-08-2009 09:28 AM
09-08-2009 09:28 AM
Re: MSA1000 Active/Standby Configuration with Two Integrated SANswitches
Current Redundancy Mode: Active/Standby (emulated)
It's in fact kind of active/active and emulates active/standby.
Hope this helps!
Regards
Torsten.
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