Link Aggregation - One to One?

I've been configuring Link Aggregation on a pair of HP 1920's and i'm guessing i've misunderstood how this actually works.

I run a pair of Linux boxes, which currently have Intel Quad Port NIC's, directly connected together with crossover cables. These links are bonded using the Linux Ethernet Bonding driver in mode 0, which gives a 4Gbit link between the two machines.

I had hoped to be able to replicate this via the 1920's, such that i'd have four links between the first server and the first 1920, four links to the second 1920, and then four links to the second server. This would allow me to physically seperate the machines but retain the high bandwidth link between them.

However it appears that unlike the linux bonding driver, the switch sticks all traffic between two specific hosts over one link, and we end up limited to 1Gbit.

Is that just the way these things are? Is there any way to make these Link Aggregation links act like the linux driver?

Maybe i've missed something in the setup?