[Users] connect Mellanox IB FDR adapter to QLogic IB QDR switch?

[Marko Kobal]

Hi,

I have a IBM iDataPlex cluster with QLogic IB QDR switches (QLogic 12200 
(iDPx) 36-port QDR InfiniBand Switch), currently there are servers with 
QLogic QME7342 QDR HCA adapters connected to those IB switches ... all 
is playing nice.

Recently I've got a couple of Mellanox IB FDR adapters (MT27500 Family 
[ConnectX-3]) and I would like them play nicely with existing IB network 
since I would like to do some research with Mellanox adapters.

On last Thursday (5 days ago) I've installed one FDR Mellanox adapter in 
one of the servers (replaced QLogic QDR adapter) and connected it to the 
QDR QLogic IB switch. Other servers with QDR QLogic adapters are also 
connected to the switch and are playing nicely. Mellanox FDR Adapter was 
detected by the server and OS (centos6), latest ofed installed. After 
reboot IB diag tools showed link is down, adapter's leds were off ... I 
didn't have time to play with it so I left it as it was. Yesterday I 
checked the status once again and I found out that the link is now 
(State: Active; Physical state: LinkUp; Rate: 40) ... so this looks 
fine. Today I went ahead and installed adapters in additional two 
servers and I see the same situation - link is down, adapter's leds were 
off ...

Is it possible that link initialization is taking sooo long (it is now 
more then one hour since I connected the adapters with the switch)? Is 
there any "magic" to force the initialization/connection or to persuade 
Mellanox FDR adapter to go directly to QDR speed?

Has anybody got any experiences in mixing QDR and FDR IB, especially 
connecting Mellanox FDR adapters to QLogic QDR IB switches? Thanks for help!


-- 
Kind regards, Marko Kobal