X4500 and network bonding

Question

Dear sirs,
in past few days I've been in touch to older x4500. I runs SUSE and we have two RAID5 arrays on it.
My problem is that I'm not able to get more performance that 2 Gbps (gigabits per second). I've looked into documentation and found some notice that is confusing to me and my colleague (as we aren't native speakers).
I read: There are two chips each one supports 1 Gbps on two interfaces (means 2 Gbps in four RJ-45 holes)
My colleague read: There are two cards with four chips each one supports 1 Gbps (means 4 Gbps in four RJ-45 holes)
Before starting hard digging to our kernel and modules I'd like to have confirmed that x4500 supports more than 2 Gbps on intergrated LAN controllers.
Bond is set to 802.3ad (configured well on our CISCO 6500 side) and load is balanced on basis of L4 (IP + port).
Any help is really appreciated.
M

Answer 1

IIRC (I haven't checked recently), Mac OS X supports bonding, but uses the standard LACP link aggregation in which all links are simultaneously active (traffic is balanced across all active links).
This usually (but not always) is not possible across multiple switches.
If you want an active/standby port configuration then you may have to roll your own - a simple script that ifconfig up's an interface when the primary fails would be relatively easy to construct.