Your "link" speed is still going to be the speed of your NIC. Since they are 1Gb each you'll never get more than 1Gb from any one server to any one client.
On the inside, LACP attempts to distribute the clients(notice I say clients and not the load). It usually does a hash function, so if you have 2 clients there's a 50% chance they will share the same link, and absolutely nothing is gained. Hopefully you now understand why its not throughput boosting in the way you are hoping. Now if you have 10+ clients there's a good chance that 2 things will be possible:
- They'll be distributed somewhat evenly(which isn't possible with just a few clients)
- Multiple clients may use a significant amount of throughput for a single link, making the LACP worth the effort.
So without lots of clients that you can *expect* will use more than a single Gb link combined, LACP gains you nothing. And since plenty of hardware either has no LACP support or very very crappy LACP support it's something you shouldn't use unless you are 100% certain that the gains are worth the potential of having network problems.
In your case, all those 2Gb links are providing more redundancy, but not really gaining you a darn thing in the performance arena. I would *never* have recommended LACP in your setup.* If you really want more throughput, go 10Gb. The cards are around $100 on ebay if you know what to look for.
As for changing the MTU for jumbo frames, that's something that either every single network device should support and have setup to match, or you shouldn't use it at all. Hint: You aren't going to see an appreciable benefit with Gb LAN, but you can almost certainly expect random network performance problems because not all of your devices will match.
* - I did do exactly what your diagram shows back in 2008. As you will no doubt find out, it's a lot of complexity that doesn't necessarily work well but does hurt reliability if not properly implemented and you don't see a performance improvement. I'd disable LACP and go single link for all of those machine if I were you(that's what I did until I went 10Gb).
The recommendation here on the forum is to not use jumbo frames or LACP. Especially so for home users.