That depends also on the switches and how they cope with bonding. There're several posts about this "issue". Bonding had been originally desinged for fault-tolerance, not speed.

I couldn't get more performance out of a bond as well, so I devided indeed to wire the server through dedicated links to my DSS, or in my case: run multiple links in different networks from my server to my DSS.

I am starting to seriously thinking of getting a pile of 10 GbE gear.

Cheers,
budy