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CLUSTER will two different pairs work

Posted on 2013-11-20
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Last Modified: 2013-11-22
Currently I have a hyper V cluster with two identical servers. I also have two more servers that are also identical. However they are not the same as the first pair.

Is it possible with windows server 2008 version of hyper-v to create one cluster using those 4 machines or do i need to just have two clusters?

Here are the pairs.

Server 1 and 2
IBM x3650 (7979) ( Dual XEONS total 4 cores)
CPUs are Dual Core Xeon 5150 2.66 GHz Socket 771 LGA (4MB Cache, 1333MHz FSB)
30 GB DDR2 PC2-5300 • CL=5 • Fully Buffered • ECC • DDR2-667 • (IBM)

Server 3 and 4
Custom Built w/SuperMicro X7DB8 Motherboard (Dual Xeons total 8 cores)
CPUs are Quad Core Xeon E5320 1.86GHz Socket 771 LGA (8MB Cache, 1333MHz FSB)
20 GB DDR2 PC2-5300 • CL=5 • Fully Buffered • ECC • DDR2-667 • (KINGSTON)

Are they close enough in spec? Also if this is a good idea or a bad idea. I'm just curious.
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Question by:MEATBALLHERO
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Expert Comment

by:Ryan McCauley
ID: 39665859
Are you saying you want to create a 4 node cluster using VMs, or you want to create a 4-node Hyper-V cluster? For a Hyper-V host cluster, there doesn't appear to be any requirement that all of the host nodes match exactly (here's the prerequisite list):

http://technet.microsoft.com/en-us/library/gg610630.aspx

In addition to being supported, there's no reason not to do this - it's fine to have Hyper-V hosts that don't all match each other. Processor counts and memory will vary between hosts, and Hyper-V will move the guest machines to whichever host makes sense for them to be on given the needs of the client machines.

If you're talking about clustering VMs that are different (and I don't think you are), then that configuration is supported by Windows, but it's up to whatever application you're clustering whether it's supported there.
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Author Comment

by:MEATBALLHERO
ID: 39667228
What about live migration. Since there are four servers do i need to use a switch for heart beat? Each server has an extra NIC port that is not used. Could I just go direct and assign two heartbeat NIC ports per server and then daisy chain them?

Port 2 Server A ---Connected to Port 1 Server B
Port 2 Server B----Connected to Port 1 Server C
Port 2 Server C----Connected to Port 1 Server D
Port 2 Server D----Connected to Port 1 Server A

I ant to be able to move virtual machines around for various purposes without having to export and import..
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Ryan McCauley earned 500 total points
ID: 39667257
I would use a switch for the heartbeat rather than daisy-chaining them like that - the point of a heartbeat is for the cluster as a whole to be aware of which other nodes are online and available and any given time, so they can be ready to assume control of downed services in case one of the nodes becomes unavailable. To do that, they all need to have open network communication.

If you've got two NIC ports on each server, one should be for public access and the other should be cluster/heartbeat communication only. Live migration requires that you have at least two networks (one public, one private), though they seem to suggest it's best to have a third network for live migration traffic. I can't see how that's a necessity, as long as you have gigabit connectivity for the private network, but that's their recommendation.

Keep in mind that live migration requires Windows Server Enterprise on the nodes, as well as a few other things:

http://technet.microsoft.com/en-us/library/ff715313(v=ws.10).aspx#BKMK_reqs
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