topic Re: Cannot get Multipath on a system in General Discussion

Cannot get Multipath on a system

eladgotfrid1 — Wed, 04 Jun 2025 10:22:38 GMT

I am pretty sure I cabled everything correctly but not 100% sure, and if I have why do I still get this error?

2 DS4246 shelves with IOM6 connected to single chassis FAS8020A cluster.

Controller netapp-1-a has no connection to IOM A of stack 1 (it is only connected to IOM B of stack 1). Controller netapp-1-a port 0b should be connected to disk shelf 1.2 (SN: 0000000DD9) IOM A circle port.
Controller netapp-1-b has no connection to IOM B of stack 1 (it is only connected to IOM A of stack 1). Controller netapp-1-b port 0b should be connected to disk shelf 1.2 (SN: 0000000DD9) IOM B circle port.

This is from the Config Advisor:

I double checked those Red lines SAS cables are connected.

I tried replacing them

Tried to re seat the IOM on this bottom shelf.

There are link lights on all the SAS ports.

Any idea?

Re: Cannot get Multipath on a system

Sig — Mon, 07 Jun 2021 16:50:53 GMT

In that current config it appears that you are only cabling IOMA modules to node 1 and IOMB modules to node 2.

At a min it looks to me like your red lines are backwards and need to be reversed.

The install guide says this is what is needed for cabling

Node1 - 0a - shelf0 - IOMA - Left/square port

Node 2 - 0b - shelfx - IOMA - Right/circle port

Node1 - 0b - shelfx - IOMB - right/circle port

Node 2 - 0a - shelf0 - IOMB - Left/square port

https://library.netapp.com/ecm/ecm_download_file/ECMP1199906

Re: Cannot get Multipath on a system

eladgotfrid1 — Tue, 08 Jun 2021 16:06:42 GMT

This is the actual diagram

From what I can see it goes exactly like the link you sent.

0a B--> Shelf1 IOM-A Square
0b B --> Shelf2 IOM-B Circle
0a A--> Shelf1 IOM-B Square
0b A--> shelf2 IOM-A Circle

Re: Cannot get Multipath on a system

Sig — Wed, 09 Jun 2021 23:07:06 GMT

Sorry Spam filters picked this up.

I think that looks good too, but I get cross-eyed looking at that stuff.

What ONTAP version?

system health subsystem show

system health alert show

Any errors?

Run this command on each node: system node run -node netapp1-01 sysconfig

Look for this output:

System Storage Configuration: Multi-Path HA
System ACP Connectivity: Inband Active

Run this command on each node: system node run -node netapp1-01 storage show disk -p

Make sure there is a primary and secondary path
PRIMARY PORT SECONDARY PORT SHELF BAY
-------- ---- --------- ---- ---------
0b.00.0 A 0a.00.0 B 0 0
0b.00.1 A 0a.00.1 B 0 1
0b.00.2 A 0a.00.2 B 0 2
0b.00.3 A 0a.00.3 B 0 3

...

Because you are using IOM6 modules and if the ONTAP version is fairly recent. Say 9.1+ you don't need to cable the ACP (RJ45 cables). They are no longer necessary, just remove and confirm ACP is running Inband (as above).

If not:

set advanced

acp configure -is-enabled false

wait 30 mins

acp configure -is-enabled true -channel in-band

Re: Cannot get Multipath on a system

Sig — Wed, 09 Jun 2021 23:13:52 GMT

Again, unless I'm crossed-eyed.....

Your Config Advisor diagram above is different than your second diagram. Do you agree?

Now the question is which one is right?

If the first diagram is correct and the commands I sent you come back wrong then cabling issue.

If your second diagram is correct and the commands I sent you are good then perhaps a Config advisor bug?

Re: Cannot get Multipath on a system

eladgotfrid1 — Thu, 10 Jun 2021 07:34:35 GMT

So actually my Visio diagram is indeed correct and the tech who installed it just didn't follow the diagram...

For some reason I though the config Advisor is showing what needs to be done and not how it is connected.

So I just confused myself.