Clustering and techniques

Posted on 2014-02-21
Medium Priority
Last Modified: 2014-03-05

for testing only;

3 x standard computers with 3 network cards each
1 x qnap ts269 pro (http://www.qnap.com - supports ISCSI and MPIO [two interfaces])
2 x simple gigabit switches

Server A nic 1 is going to switch 1 ( -
Server A nic 2 is going to switch 2 ( -
Server A nic 3 is going to switch 3 (for management purposes only) []

Server B nic 1 is going to switch 1 ( -
Server B nic 2 is going to switch 2 ( -
Server B nic 3 is going to switch 3 (for management purposes only [])

Active Directory
Server C nic 1 is going to switch 3 (for AD management and the above) []

QNAP nic 1 is going to switch 1 ( -
QNAP nic 2 is going to switch 2 ( -

(see image)Layout
The question I wanted to ask was in all diagrams or images on the internet not a single one shows a link between the switches. If we remove the link between switch 1 and switch 2 communication is not possible. Doesn't a link need to be both switches?

So removing the link from nic 1 on Server A means it cant get to nic 1on Server B.
[thats fine i get that bit] however it should still be able to see nic 2 on Server B on switch 2 using nic 2 on itself but it doesn't???

I mean should node A be able to ping both IP addresses on node b even if one of its links fails? doesn't the traffic just go out over its other nic to the second switch?

Secondly, how do we configure both nic's on the qnap. at the moment all the images on the net show one link to the "storage array". Our storage array has two network cards we would like to use as a redundant path should one of the interfaces get disconnected.

How does one configure that?
Sorry, I'm just new to all of this?

p.s. see attached image for out layout
Question by:dqnet
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Expert Comment

ID: 39879249
i'm not an expert in this by any means but I do know that the switches should not be dependent on each other for a link because if one fails the other one should be able to handle communication on its own - a link between them is therefore only useful for managing in a working state.

I believe what you are missing is configuration of multi-path across the switches and that takes more knowledge than I have.

A search of EE turned up this link:-

Author Comment

ID: 39880993

Yes, your exactly right. I also think its something to do with MPIO and how to set it up.

I am going to do some more experimenting tomorrow but in the meantime can someone explain to me how this should be setup?

Assuming I take the link away between the switches (which I now have) does the image above look correct? Is that how it should be setup?

p.s. that link you provided is exactly what I need but for HyperV.

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Expert Comment

ID: 39881120
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Author Comment

ID: 39885658
This is a great article thanks..

But it isn't really clustering using Windows Clustering Services.

Is there a step by step guide for creating a cluster with 3 network cards?
LVL 19

Accepted Solution

regmigrant earned 1500 total points
ID: 39886629
Although your original question title indicates a need for clustering advice your actual text asks about the infrastructure and network setup - setting up clustering service is straight forward, setting up one that works effectively and copes with all failover conditions can be tricky and depends on several factors (of which the OS revision is only the first).

I recommend you mark this one as answered and put a new one up -  you will get fresh eyes on it if you list it specifically as a question on windows clustering and say which server version you are working with.

I also noted an omission in my first response - the link between the switches provides an alternate path should one of the links between a switch and a server  fail - but the point that they are not inter dependent stands

Author Comment

ID: 39889235

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