10-29-2008 01:13 PM - edited 03-06-2019 02:12 AM
Hello,
Here is a quick overview of our setup.
We have a 4 NIC Port on our NAS server which are Intel Pro 1000 PT connectors. They support teaming and vlan and some advanced features.
ALL 4 are connected to port 41,42,43 and 44 of our Cisco WS-C2960G-48TC-L
Now, when we configure the teaming on the NAS, it says whether we want to use a static link aggregation (SLA) or Dynamic which is 802.3ad
What we did is a Static Link Aggregation for now and the switch config is setup like that for the ports:
interface GigabitEthernet0/41
switchport access vlan 100
switchport mode access
speed 1000
duplex full
channel-group 1 mode on
!
interface GigabitEthernet0/42
switchport access vlan 100
switchport mode access
speed 1000
duplex full
channel-group 1 mode on
!
interface GigabitEthernet0/43
switchport access vlan 100
switchport mode access
speed 1000
duplex full
channel-group 1 mode on
!
interface GigabitEthernet0/44
switchport access vlan 100
switchport mode access
speed 1000
duplex full
channel-group 1 mode on
Now we ran some tests and we get about 1.6 GBPS throughput, but that should be a 4 GB aggregate link. We want to get the maximum throughput possible.
1. Are our configs exactly how they should be to have everything optimized?
2. What other Network Adapter settings in the server should be set in order for it to be perfectly setup ?
3. Anything else that you might think of that should be configured in order to have that 4 port aggregate work perfectly ?
Really appreciate the help
Thanks
10-29-2008 01:24 PM
Depends on the load-balancing method used. The 2960 is not included in the attached link but you could try this command
2960(config)# port-channel load-balance ?
and you will see the options. Bear in mind that etherchannel on the Cisco switch will always use the same link for the same src or dst mac (depends on which method youy have chosen). Basically you need to work out which load-balancing type will give you the most variation in source and destination.
If the 2960 follows the 2955 then you are limited to mac-address only, whereas other switches can use src/dst IP as well and the 6500 or example can use all these plus src/dst ports.
Jon
10-29-2008 02:03 PM
Hello,
Thanks, but we do not want to Load Balance, basically we have other servers which communicate to the NAS on a 1 GBPS link they have. We want that when those machines transfer data to the NAS, that the 4 ports act as one big port of 4 GBPS... possible? If so, what are the settings to put on the switch and server for the NIC's...
10-29-2008 02:05 PM
But that's exactly what etherchannel does on a Cisco switch ie. it uses all the physical links within the bundle and it uses load-balancing across those links so it utilises all links within the bundle.
Maybe i am not understanding your question.
Jon
10-29-2008 02:21 PM
Basically I am just wondering with the setup we provided in the first post, if there is anything else we should do on the cisco or server to make sure this is a perfect team of 4 X 1 GBPS network cards, since as I said when we tested multiple writes, it always gets to about 1.6 GBPS and not higher, unless something else is limiting it (os, disks etc...) but as far as the disks goes, we carefully chose our hardware so that it would easily take 3 GBPS speeds...
Please let me know
10-30-2008 07:35 AM
Anything on this please?
10-30-2008 09:45 AM
Please read what i wrote about load-balancing. You may not want to load-balance but that is what etherchannel does and there is no way round this. You need to choose whether load-balancing on src or dst mac will give you a greater variety. The more different src or dst mac's the better.
If you find that the only way to get that range is on src and dst IP then you need a different switch.
Note - this is assuming the 2960 only load-balances on src/dst mac. See previous post as to how to find out.
Jon
10-30-2008 10:19 AM
ok so if basically, we have a bunch of servers who all process and write the data on the NAS, then it is better to load balance on SOURCE MAC right? so that packets coming from different sources (the servers) will take different paths... is that correct?? or am I missing something...
10-30-2008 10:21 AM
That is correct.
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