HPE Community read-only access December 15, 2018
This is a maintenance upgrade. You will be able to read articles and posts, but not post or reply.
Hours:
Dec 15, 4:00 am to 10:00 am UTC
Dec 14, 10:00 pm CST to Dec 15, 4:00 am CST
Dec 14, 8:00 pm PST to Dec 15, 2:00 am PST
ProLiant Servers (ML,DL,SL)
cancel
Showing results for 
Search instead for 
Did you mean: 

DL380 G7 Network Cards Issue

 
TomGardners
Occasional Visitor

DL380 G7 Network Cards Issue

We have the same issue i am about to describe with several other servers however i will use the DL380 G7 as the primary example to avoid confusion.

Basically the G7 came with 4 Onboard network cards sousing the HP network management control panel i have teamed them together to work in 802.3ad mode with everything else set as default. The server ends of each network card are configured with LACP etc Indvidually they work. The probleem we are facing is when they are teamed they work to some degree but not fully.

We seem to only get a transfer rate of 1 GBPS out of a possible 4 and it only looks like its utalizing one of the 4 cards to transfer information. If one fails it will fail over fine it just dosent seem to use all 4 network cards for transfers.

Thanks for any help you can offer on the subject!
3 REPLIES
rick jones
Honored Contributor

Re: DL380 G7 Network Cards Issue

Teaming/trunking/bonding/aggregating is all about increasing the *aggregate* throughput for a single "interface." However, with very few exceptions, they will not increase the performance of a single flow - eg TCP connection.

A "flow" can be defined by the local/remote MAC (Ethernet) address, or the local/remote IP address or by the full four-tuple of local/remote IP, local/remote port number (eg TCP or UDP port number).

The software running in the host will determine what is a flow for outbound purposes. The firmware running in the switch will determine what is a flow for inbound purposes. Inbound and outbound relative to the server.

Essentially, if you require a single stream/flow/connection to go faster than 1Gbps you need to upgrade to 10GbE.

What is the nature of the transfers you are performing? Are they just one TCP connection at a time? Are the mulitple connections but to only one remote IP address? Are they multiple connections to different IP addresses, but all through a router?
there is no rest for the wicked yet the virtuous have no pillows
TomGardners
Occasional Visitor

Re: DL380 G7 Network Cards Issue

For the example i am using this is a Backupserver transfering files from an almost identical server with same teaming setup. These servers are connected to a 5 stack of 3com 5500G switches, each connection from each server is connected into a differnt switch.

IS the team treated as 1 indivual connection there for limited at the switch at 1GBps ?

rick jones
Honored Contributor

Re: DL380 G7 Network Cards Issue

If the backup server software uses just one TCP connection then there is just the one flow, regardless of what the switches do.

So, the question becomes - how many TCP connections does the backup server softare use?

Just to re-iterate - even if the sending system did send traffic for a single connection out each of the interfaces in the team, or even if the backup software used multiple TCP connections, the behaviour of the switch will determine if they are still spread-out on the way in to the destination.
there is no rest for the wicked yet the virtuous have no pillows