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399
April 6th, 2008 13:00
Invista and split brain ?
I have a customer that want me to design a Invista installation over two locations, but I can't find out how to do this and ensure no single point of failur.
I can put a CPC in each location and mirror the ICRV so I have one in each location. I haven't found out what will happen if the connections between the two location is lost.
Can anyone tell me how I can overcome this situation.
I can put a CPC in each location and mirror the ICRV so I have one in each location. I haven't found out what will happen if the connections between the two location is lost.
Can anyone tell me how I can overcome this situation.
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vijayswami
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May 4th, 2008 17:00
Lerager
4 Posts
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May 15th, 2008 02:00
What will happen if the communication connections all got destroyed ?
If I have one CPC per fabric per building, does this mean that both will keep running, since my ICRV also is mirrored to both location ?
If I have 1 CPC per fabric split across the two locations, and again the communication connections all got destroyed, wouldn't both keep running, even they can't communicate to the system on the other site on any of the fabrics ?
RickBrunner1
117 Posts
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May 15th, 2008 06:00
Per the guides the Primary and Secondary ICRV's should be on separate Arrays
You will want one ICRV in the same location of one CPC node, and the other in the location of the other CPC node (somewhat depicted by the diagram in the guides) Think of it like fault isolation silo's. As a best practice an environmental study should be done to be sure there are no failure points that cross the two locations (power, ac, communication, fiber..etc)
Invista will go though split brain detection logic and in the end only one node will be up.
I know these answers will not satisfy you as they did not for me, so test it and you will then have confidence (maybe you will even feel like Chuck Yeager afterward¿ well that is probably taking an analogy too far, but you will defiantly have the pucker factor the first time you pull the comm. lines) You do not need separation to test this, many customer have these same questions, answers are normally not sufficient.. most of us like to see it in action, so it has been tested and when things are configured correctly, it works and all are impressed and confident. The one word of caution is make sure you have the CPC- ICRV configuration correct, anytime we have seen issues it will typically be poorly configured ICRV¿s.