Aim: create a server farm block for about 400 servers that have to dual home into the 2 switches that would comprise of this block
I already have a pair of spare 6500's which I can reuse for a server farm block. It currently has the SUP2 and the WS-X6548-GE-TX modules which I believe have an oversubscription rate of 8:1
I can upgrade the Sup2 to Sup720 on these 6513's and use this as my server farm block. I'm aware that the 6548 wouldn't truly leverage the 720 fabric but I don't think the next option does any better
- Trade in all of the above equipment and buy new 4500 switches to serve as the server farm block. However, I checked out the line cards for the 4500 and the best GE module seems to be the WS-X4548-GB-RJ45 which also has a 8:1 oversubscription
Is one option better than the other? Obviously, with option 1, I have to replace fewer components hence, it would be an easier sell on my side
With a Sup720 you have an inbuit Switch Fabric Module and as the WS-X6548-GE-TX is fabric enabled at least you won't be on the 32Gbps shared bus.
The WS-X6548-GE-TX is not a server farm module. As you say it is oversubscribed 8:1.
Assuming you don't have a separate SFM already in your chassis then going with the Sup720 will at least move you forward but without upgrading your modules you are not really benefitting in terms of throughput.
Are all servers equal ie. do some need a lot more throughput than others ?
My understanding is that you will run into additional problems when using a 6513 chassis even with a sup720 because not all cards will get full 40Gb bandwidth. The 6509 is currently the largest chassis you can get full bandwidth using the 67xx series cards (and of course the sup720).
2) If you're using a card that has port groups, i.e. some group of ports map to a bottleneck, you use less ports to reduce the oversubscription even down to 1:1. E.g. only use 19 gig ports of the first (1..24) half and 19 gig ports of the second (25..48) half of the 6748's 48 ports. Then your only using 38 gig.
If you know the static bandwidth usage per server, you can manually balance server connected ports to the port groups to obtain what ever static load you want on the port group. E.g. if you have 6 gig ports on the card that feed to 1 gig, you could connect one server that normally uses 50%, one that uses 30%, and two that use 10%, to minimize the probability of oversubscription of the bottleneck.
Of course, doing all these port allocations is quite a bit of work and if the server bandwidth usage changes, you need to recompute. Usually not worth doing except for critically important servers.
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