Increasing throughput on iSCSI switch

i have a pair of Dell PowerConnect 5424 switches that are used specifically for iSCSI.  I have 6 ports setup between the two but i only get 1 Gbps speeds.  I would think that it would aggregate them together so that i would get 6 Gbps.

Here is a basic overview of the switch configuration.

Port 1 - VLAN 1 - Management

Port 2-18 - VLAN 11 - iSCSI

Port 19-24 - VLAN 11 - LAG between both switches.  Currently only displaying speed of 1 Gbps.  I'd like this to show 6 Gbps.

Here are the commands that i used to configure both switches.
 
console(config)# vlan database
console(config-vlan)# vlan 11
console(config-vlan)# ex
console(config)# interface vlan 11
console(config-if)# name iSCSI
console(config-if)# ip address xxx.xxx.xxx.xxx  255.255.255.0
console(config-if)# ex
console(config)# interface vlan 1
console(config-if)# ip address xxx.xxx.xxx.xxx 255.255.255.0
console(config-if)# ex

console(config)# interface range ethernet g(19-24)
console(config-if)# channel-group 1 mode auto
console(config-if)# end

console# config
console(config)# no iscsi enable
console(config)# port jumbo-frame
console(config)# interface range ethernet g(2-18)
console(config-if)# flowcontrol on
console(config-if)# spanning-tree portfast
console(config-if)# switchport access vlan 11
console(config-if)# ex

console(config)# interface port-channel 1
console(config-if)# flowcontrol on
console(config-if)# switchport mode trunk
console(config-if)# switchport trunk allowed vlan add 11
console(config-if)# end

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c3veryAsked:
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SouljaConnect With a Mentor Commented:
I don't know about the snmp issue, but yes the LAG will load balance the traffic across the links. You should have no issue there.
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eeRootCommented:
How are you doing the speed test to see if you are getting 6 Gbps speeds?  Your testing equipment may be on 1Gbps ports, and therefore cannot move data over that speed.
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SouljaCommented:
While Link aggregation bundles the interfaces into one logical port, they are still only going to transfer data over single interface per ip, mac, etc. What I mean is a host transmitting data across your LAG is not going to use but one interface in that LAG, so 1Gps is correct.

Another analogy is look at it as a 6 lane highway. While you will be able to fit more traffic on the highway (LAG)  a car (host) can only use one lane at a time.
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c3veryAuthor Commented:
I've gathered the data from SNMP.  Other switches that i have 2 port LAGs show a 2 Gbps speed.  I understand that other ports on the switch are single 1 Gbps ports and i'm not expecting those devices to use more than what the port allows.  My concern is when i have multiple 1 Gbps devices, is the 6 port lag smart enough to know which "lanes" are more open and free instead of having the "cars" in a single lane at a time.  Since this is iSCSI based i just want to make sure i mitigate congestion as much as possible.  Hope that makes sense.
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c3veryAuthor Commented:
Thanks, that's all i needed to know.
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