[LU-5693] LNET configuration for dual ib port/ dual rail

• Type: Bug
• Resolution: Won't Do
• Priority: Critical
• Affects Version/s: Lustre 2.5.2
• Environment: Centos 6.5 ; mellanox 2 switch; Dell server with 2 IB ports

Epic/Theme

Dual-Rail LNET lustre-2.5.2

• Story Points: 100
• Severity: 4
• Assignee: WC Triage
• Reporter: Atul Yadav

Description

Dear Team,

IB-Switch-1 ib0 ( All IB0 port connected to this switch only) 192.168.2.*
IB-Switch-2 ib1 ( All IB1 port connected to this switch only) 192.168.3.*
Both the IB switch are physically separated.

IO1 ibo 192.168.2.1
IO1 ib1 192.168.3.1
IO2 ib0 192.168.2.2
IO2 ib1 192.168.3.2

Client1 ibo 192.168.2.10
Client1 ib1 192.168.3.10

Goal:- Switch level fail-over

As per the above details we need to configure LNET in such a way if 1 IB switch fail, then the communication should establish from 2 IB switch.

Please guide us to archive the goal

Thank You
Atul Yadav