MSA 2012i host link down

[Jeroen H_1]

Since a few weeks I get this in my event log:

Info 2010-02-18 13:26:32
111
A478 Host link up Chan0: 0 Loop IDs
Info 2010-02-18 13:26:32
111
A477 Host link up Chan1: 0 Loop IDs
Warning 2010-02-18 13:26:25
112
A476 Host link down Chan1
Warning 2010-02-18 13:26:25
112
A475 Host link down Chan0

The iSCSI switch gives me no information

Does anybody have an idea how this could be happening?

[Johan Guldmyr]

Hi!

This would usually indicate something wrong with the network connection.

Have you checked the cables or the switch where the MSA is connected?

Can also be caused by having both single and dual path servers connected.

[Jeroen H_1]

Hi!

This would usually indicate something wrong with the network connection.

Have you checked the cables or the switch where the MSA is connected?

Can also be caused by having both single and dual path servers connected.

No I haven't checked the cables. I will replace the cables between the switch and the controllers. ANy recommendation on witch cables to use?

I connect with MPIO but the global host list looks a bit strange:

donkeykong.iq.local
Port A0 & Port B0 & Port B1

spaceinvaders.iq.local
Port A0 & Port B0

iqn.1991-05.com.microsoft:megaman.iq.local
Port A0

megaman.iq.local
Port A0 & Port A1

tombraider.iq.local
Port A0 & Port A1 & Port B0 & Port B1

Thnx for your quick response.

[Jeroen H_1]

I think it's strange that both ports go down simultaneously.

[Johan Guldmyr]

It is pretty strange.

Are those two ports in the same controller? Do they go to the same switch?
Do you only have one controller in this MSA?

[Johan Guldmyr]

Oh, and about the cables.
Maybe you want CAT6 cables but this depends on your environment where the cables run. Maybe you need STP cables if you have a lot of interference.

[Jeroen H_1]

I have a dual controller setup and one 2910al switch.

[Johan Guldmyr]

Might be worth checking out Ethernet-settings on the switch for the ports where you have connected the MSA. Or maybe try other ports in the switch.

[Jeroen H_1]

I wil try a few things. Any idea in which direction I should look. Could it be Flow Control or Jumbo frames?
I am a bit of a newbie in this area. Kind of you to help me out a little bit here.
Any other settings worth looking at?

[Johan Guldmyr]

Well I don't think you should have jumbo frames enabled. Unsure about the flow control - guess the only settings you need to worry about are the ones you can set on the ethernet nic in the web gui of the MSA.

But on the switch, check duplex settings, if there's a fixed speed on the port or if it's auto. I'm not experienced with the 2910al switch.