AIX 5.2 - HALF-DUPLEX is faster ?

[MoshiachNow]

Hi,

Once we upgraded fron AIX 4.3.3 to 5.2,some stations had to be switched from 100 FULL_DUPLEX to HALF-DUPLEX,otherwise the transfer rate would drop down to 20 KB/sec.

Looks like a driver problem with certain network cards on AIX 5.2 ,versus 3COM switches.

Anybody has similar experience ?

"Long live king Moshiach !"

http://www.7for70.com/

 

[needcoffee]

levw,

How are the stations connected to the network? It sounds like some may be connected via half-duplex ports on the hub/switch causing the performance issue. Have you tried using a current full-duplex box on a port for a machine that you had to switch to half-duplex? Are the hub/switches managable, what type/vendor?

I have not encountered this with an AIX machine before but have seen it with win boxes not set to autonegotiate and the switches set incorrectly.

needcoffee

 

[usige]

levw,
We have had this problem quite a bit. Make sure that the ethernet cards in the server are set to 100-Full and then make sure the switch/hub ports are set to 100-Full. We have never gotten AIX and Cisco catalyst switches to autonegotiate and you might have a similar problem w/ your 3coms. Forcing the system and network port to the same setting has always fixed the problem.

 

[MoshiachNow]

Thanks,

I our case all AIX boxes were 100-Full on AIX 4.3.3,same ALL ports on the 3-com switch.

Definetly something have changed as of AIX 5.2.
Looks to me like a new ethernet drivers-versus-3com issue.

"Long live king Moshiach !"

http://www.7for70.com/

 

[bonsky]

Apart from fixing the network config to 100Mbps full duplex, you might want to update your firmware level for your network cards as well.Perhaps, 5.2 does have a match level of firmware running. You updated your Os and so us the firmware.

 

[MoshiachNow]

Thanks,

However:

1.We are on the current latest AIX 5.2.0 level(ML1 is on its way)

2.The IBM site

http://techsupport.services.ibm.com/server/mdownload/download.html#adapter

does not contain new firware for the following board in question:

ent1 Available 3A-08 IBM 10/100 Mbps Ethernet PCI Adapter (23100020)


"Long live king Moshiach !"

http://www.7for70.com/

 

[Yegolev]

i have not encountered this change on my migrations from 4.3.3-09 to 5.1.0-03, but we all know about the trouble with autonegotiate. perhaps there is something wonky with your upgrade image? personally, this is where i would blame the switch and move along to the next project. =)

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