Best network setup 3nodes-HA for virtualisation. X540/X520 ?

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Slingshotz
Posts: 26
Joined: Sat Apr 12, 2014 6:52 am

Fri Sep 19, 2014 10:24 pm

upgraders wrote:You are crossing traffic so two separate sync channels and iscsi... hum I dunno I think I'd like to hear Starwind chime in. I would think you would not want to mix traffic or what that would cause (caveats) ? but yes you are right since you have two sync and iscsi and one goes down in that configuration you would not lose, but I am not sure.. perhaps that's why you can't get MIPO working?? if you used nic teaming with one IP so that failover would happen automatically that may be an option. My configuration was drawn up by Starwind a few years back and ok'ed by Anatoly so I would think if there was a better configuration he would have done it that way. Ive been running with this setup for about a month now and I am very pleased.

Jason
I really appreciate your help in this and it's good to know someone else has this style configuration working. There was very little to go on as most designs involve using two 10Gbe switches which look much easier to configure but didn't make sense to me as it was just another layer of failure and costs. So in your iSCSI Initiator Devices MPIO configuration, do you only have three paths for each target? ie, from Node 1 to Node 3, iSCSI target on Node 1, would be 0.0.0.0-127.0.0.1, 11.0.3.1-11.0.3.2 and 11.0.4.1-110.4.2?

Did Anatoly say anything about if your sync channel fails and your iSCSI is up would cause any issues? I'm just worried about causing any split brain type issues.
upgraders
Posts: 16
Joined: Mon Mar 24, 2014 12:22 pm

Fri Sep 19, 2014 11:41 pm

Your're welcome...

So in true HA fashion each server targets the other two nodes and itself using 127.0.0.1 for the iSCSI on the sync Anatoly set this up and if you need it I could try to do some more screen grabs but basically similar to the iSCSI but through the starwind interface the partner nodes sync. So I have the Quorum and the main disk "Volume 1" So on node 1 the Quorum's partner device is node 2 and 3 for the sync and Volume 1 the same.

So for some reason Starwind labeled my node1 differently, however so you know

Node1 is 192.168.1.90
Node2 is 192.168.1.92
Node3 is 192.168.1.94

as far a split brain no there was not a discussion, but this is what the Quorum is for and the cluster votes.

Here are screenshots from Node 1 showing the connections. I don't see how to add multiple images in the same post so I will post three.
The iSCSI setup
The iSCSI setup
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Last edited by upgraders on Fri Sep 19, 2014 11:47 pm, edited 2 times in total.
upgraders
Posts: 16
Joined: Mon Mar 24, 2014 12:22 pm

Fri Sep 19, 2014 11:42 pm

Here are the starwind settings one of 2
Starwind1.jpg
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upgraders
Posts: 16
Joined: Mon Mar 24, 2014 12:22 pm

Fri Sep 19, 2014 11:43 pm

Here is two of two

Hope this helps. - Jason
Starwind3.jpg
Starwind3.jpg (56.51 KiB) Viewed 3278 times
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Anatoly (staff)
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Joined: Tue Mar 01, 2011 8:28 am
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Tue Sep 23, 2014 10:55 am

It seems Jason shed some light on your misunderstanding of Starwind HA concept, Slingshotz. Thank you, Jason.

And about split brain: it is possible only if sync channel and HB are dead simultaneously.
Best regards,
Anatoly Vilchinsky
Global Engineering and Support Manager
www.starwind.com
av@starwind.com
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