hardware for a server 2008 r2 cluster and redundancy questions

i have been tasked with setting a cluster server for some software we have, this software requires ul certification of each component and the cluster topology has to have no single POF.
for the cluster servers i have 2 dell power edge 2950's and i shall probably be getting a 3rd network card for each
i have a 2850 that i shall be setting up as the hard drive witness (i know setting up server 2008 r2 shall be a pain on this one due to the perc back plain)
and i have a vtrak m500 for the iscsi device, on the way
my 1stv question is shall the hardware i have be acceptable for the server 2008r2 cluster

my assumption is if i need to pull the witness for maintenance the cluster will survive
if i need to pull a node for maintenance while the witness is up the cluster shall survive
if a single peice of hardware fails and needs to be replaced in the vtrak my cluster will survive (vtrak shall be set up with 1Tb drives all set at raid 1
is the above accurate?

how can i solve the network switch as a POF?
as it stands can i set up 2 network interfaces to the iscsi? as the vtrak has 2 100/t jacks but i still require a connection to the hard drive witness correct? or does this topology not require a witness?
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csePixelatedAsked:
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kevinhsiehCommented:
Each server would have one or two NICs connected to each of two switches. The switches need to have two connections between them. Your storage needs to have at least one interface connected to each switch.

Yes, the disk witness is just a dedicated volume a few hundred mb in size that is mounted by all cluster nodes.
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csePixelatedAuthor Commented:
i have already found the vtrak to be lacking no redundant controller. looking for a suitable replacement.
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kevinhsiehCommented:
You can have two switches. You can team the NICs to get failover at the network level. If you follow a Microsoft's advice and don't mix iSCSI with teaming, you will need at least four NICs.

Why would you use old hardware that is already out of hardware support?

You would normally use a disk witness, which is just a small volume on your shared storage, so you don't need a third server. You may be able to use Dell MD1200 for shared storage if you can find an older raid card that will work on your servers. A Dell MD3 line of storage array should work without issue.
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csePixelatedAuthor Commented:
so what would that make my physical topology look like?

price. i found the vtrak cheep

so the disk witness is simply some log space on the iscsi device?
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csePixelatedAuthor Commented:
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