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CCR and File Share Witness Question
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CCR and File Share Witness Question - 9.Oct.2007 5:26:10 PM
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RMGreenley
Posts: 24
Joined: 25.Jan.2007
Status: offline
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I have a quick question about setting up the File Share Witness for my CCR mailbox servers. Should the FSW be able to talk to the cluster on the Private interfaces? Or does the FSW normally communicate with the cluster through the Public interfaces? None of the material I've read has addressed this, so I'm assuming there's no need to enable the FSW to communicate with the cluster via the private cluster interfaces, but it makes some sense to me that it would so I want to be sure.
Thanks in advance.
Ray G.
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RE: CCR and File Share Witness Question - 9.Oct.2007 5:51:11 PM
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RMGreenley
Posts: 24
Joined: 25.Jan.2007
Status: offline
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Thanks for the reply. When I mentioned "materials I've read" in my first post, it did include the msexchange.org tutorial you linked (I should have been more explicit, my apologies). If you read the tutorial, you'll see in part one where it talks about setting up the network adapters for the Mailbox servers, and in part two where it talks about creating the FSW file share, all of which is great. However, absent is where it talks about configuring the FSW network adapter, and whether or not it needs to talk to the CCR Private interfaces. Perhaps it's absent because the FSW is not supposed to talk on the CCR Private interface. But I'm not sure, and that's why I'm here. ;^)
Ray G.
< Message edited by RMGreenley -- 9.Oct.2007 5:53:17 PM >
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RE: CCR and File Share Witness Question - 10.Oct.2007 11:29:46 AM
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rparsons1000
Posts: 143
Joined: 29.Aug.2006
Status: offline
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Typically the private interface will be on a seperate subnet or VLAN so it wouldn't be able to communicate to the FSW. You should use the Public interface.
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RE: CCR and File Share Witness Question - 10.Oct.2007 11:55:32 AM
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RMGreenley
Posts: 24
Joined: 25.Jan.2007
Status: offline
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That's what I was looking for. Thanks!
Maybe I'm crazy, but it makes sense to me that if you're already segregating the cluster traffic between the primary and secondary cluster machines, why wouldn't you also segregate the cluster traffic from the FSW? Does anyone know why the FSW wouldn't handle cluster communications on the private interface? Is it because it's unnecessary, impractical or both?
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RE: CCR and File Share Witness Question - 10.Oct.2007 8:41:35 PM
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rparsons1000
Posts: 143
Joined: 29.Aug.2006
Status: offline
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The idea is to prevent split-brain syndrome. If the FSW is up and heartbeat is down it won't failover. If on the private network FSW & heartbeat could be down, it will probably failover but the original active node might still be working. Actually that might even be ok. I wouldn't want to try it in production though.
Keep in mind that FSW is recommended on a hub transport server somewhere though and that has to be on the same subnet/VLAN regardless.
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