best way to connect server to 2x 6400 switches

[stevenew]

What would be the best way to connect a 2008 server to 2 x 6400 switches that are stacked at the back with 10gb cables ,we have no budget restrictions.

[chapman1507]

I don't understand this question. What is the purpose of your question (wich port? ...)

[m00n]

In my opinion if the 2x 6400 are stacked you can connect with two NIC's in 2008 server one to one switch in stack and second to another switch in stack i don't know if 2008 server can make something like link aggregation (i use linux/unix servers) if yes you can make something like link aggregation between server and stack.

[krzysioD]

Well, the best should be a 4 x 10G Gbics in both switches and two 10GB fibre cards in server, i think, if you don't have budget savings.
Lot cheaper and more appropriate would be to go with Copper 1 GbE but have two servers in HA (each server with two links to different switch) .

[m00n]

os6400 use 10gb only in stack you can't connect switch to servere via 10g uplink only aggregation on rj45 ports, something like multi chassis link aggregation

[krzysioD]

Ok, you are right, only from 6850+ you could use a SFP-10G-SR* family
So, only a copper 1Gbe link aggregation, like 4 times with good NIC on server side.

[jlettinck]

Most servers do support IEEE802.3AD link aggregation. So if you have multiple NIC's in your server best would be to have at least one connecting to switch stack number 1 and the other nic to the second switch stack member. This will give you effectively a 2 gigabit connection, loadbalancing and failover. You can also expand to a maximum of 8 connected nic interfaces on the server.