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Using e0M as Cluster Management Interface port ?

Hi,

We are configuring a FAS6280 in cluster mode. When we created the cluster on first node, we choosed e0M as cluster management interface port. It works well. In case of HA failover, the cluster_mgmt is linked to a0a, a data ifgrp and not e0M on the second node. We can't do a migrate to node2/e0M. But it works with node2/a0a which is not connected to network admin switch...

stor-dc1-c105::*> network interface show -failover

         Logical         Home                  Failover        Failover

Vserver  Interface       NodeSmiley Tongueort             Group Usage     Group

-------- --------------- --------------------- --------------- ---------------

SVshared

         SVshared_lif1   stor-dc1-c105-01:a0a  system-defined

                             Failover Targets: stor-dc1-c105-01:a0a,

                                               stor-dc1-c105-01:e0M,

                                               stor-dc1-c105-01:e0c,

                                               stor-dc1-c105-01:e0f,

                                               stor-dc1-c105-01:e5a,

                                               stor-dc1-c105-01:e5b,

                                               stor-dc1-c105-01:e7a,

                                               stor-dc1-c105-01:e7b,

                                               stor-dc1-c105-02:a0a,

                                               stor-dc1-c105-02:e0c,

                                               stor-dc1-c105-02:e0e,

                                               stor-dc1-c105-02:e0f,

                                               stor-dc1-c105-02:e5a,

                                               stor-dc1-c105-02:e5b,

                                               stor-dc1-c105-02:e7a,

                                               stor-dc1-c105-02:e7b

stor-dc1-c105

         cluster_mgmt    stor-dc1-c105-01:e0M  enabled         clusterwide

                             Failover Targets: stor-dc1-c105-01:e0M,

                                               stor-dc1-c105-02:a0a

stor-dc1-c105-01

         clus1           stor-dc1-c105-01:e0d  system-defined

         mgmt1           stor-dc1-c105-01:e0M  disabled

                             Failover Targets: stor-dc1-c105-01:e0M

stor-dc1-c105-02

         clus1           stor-dc1-c105-02:e0d  system-defined

         mgmt1           stor-dc1-c105-02:e0M  disabled

                             Failover Targets: stor-dc1-c105-02:e0M

the command to migrate the port to node2/e0M fails :

stor-dc1-c105::*> network interface migrate -vserver stor-dc1-c105 -lif cluster_mgmt -source-node stor-dc1-c105-01 -dest-node stor-dc1-c105-02 -dest-port e0M

Error: command failed: Failed to migrate interface stor-dc1-c105;cluster_mgmt.
       migrate: invalid port.

stor-dc1-c105::*> network interface show                                                                            

                      Logical    Status     Network            Current       Current Is

Vserver     Interface  Admin/Oper Address/Mask       Node          Port    Home

----------- ---------- ---------- ------------------ ------------- ------- ----

SVshared

            SVshared_lif1

                         up/up    10.1.4.61/22       stor-dc1-c105-02

                                                                   a0a     false

stor-dc1-c105

            cluster_mgmt up/up    10.1.0.70/22       stor-dc1-c105-01

                                                                   e0M     true

stor-dc1-c105-01

            clus1        up/up    192.168.192.101/24 stor-dc1-c105-01

                                                                   e0d     true

            mgmt1        up/up    10.1.0.68/22       stor-dc1-c105-01

                                                                   e0M     true

stor-dc1-c105-02

            clus1        up/up    192.168.192.102/24 stor-dc1-c105-02

                                                                   e0d     true

            mgmt1        up/up    10.1.0.69/22       stor-dc1-c105-02

                                                                   e0M     true

We find that e0M on node1 has data role whereas node2 has node-mgmt role

stor-dc1-c105::*> network port show

                                      Auto-Negot  Duplex     Speed (Mbps)

Node   Port   Role         Link   MTU Admin/Oper  Admin/Oper Admin/Oper

------ ------ ------------ ---- ----- ----------- ---------- ------------

stor-dc1-c105-01

       a0a    data         up    1500  true/-     auto/full   auto/1000

       e0M    data         up    1500  true/true  full/full   auto/100

       e0a    data         up    1500  true/true  full/full   auto/1000

       e0b    data         up    1500  true/true  full/full   auto/1000

       e0c    data         down  1500  true/true  full/half   auto/10

       e0d    cluster      up    9000  true/true  full/full   auto/10000

       e0e    cluster      down  9000  true/true  full/full   auto/10000

       e0f    data         down  1500  true/true  full/half   auto/10

       e5a    data         down  1500  true/true  full/half   auto/10

       e5b    data         down  1500  true/true  full/half   auto/10

       e7a    data         down  1500  true/true  full/half   auto/10

       e7b    data         down  1500  true/true  full/half   auto/10

stor-dc1-c105-02

       a0a    data         up    1500  true/-     auto/full   auto/1000

       e0M    node-mgmt    up    1500  true/true  full/full   auto/100

       e0a    data         up    1500  true/true  full/full   auto/1000

       e0b    data         up    1500  true/true  full/full   auto/1000

       e0c    data         down  1500  true/true  full/half   auto/10

       e0d    cluster      up    9000  true/true  full/full   auto/10000

       e0e    data         up    1500  true/true  full/full   auto/10000

       e0f    data         down  1500  true/true  full/half   auto/10

       e5a    data         down  1500  true/true  full/half   auto/10

       e5b    data         down  1500  true/true  full/half   auto/10

       e7a    data         down  1500  true/true  full/half   auto/10

       e7b    data         down  1500  true/true  full/half   auto/10

Is there a solution ? Does someone else use e0M as cluster management interface port ?

Re: Using e0M as Cluster Management Interface port ?

Should be no problem, though usually I prefer to use one of the onboard 1gb ethernet ports (e.g. e0a) for the management traffic (it's faster), and have e0M as a failover target. Can you try 'net port modify -node stor-dc1-c105-02 -port e0M -role data' ?

Don't forget to create a failover group for SVshared

Re: Using e0M as Cluster Management Interface port ?

Thanks for your answer. I already tried this. You can see the return below :

stor-dc1-c105:Smiley Embarassed net port modify -node stor-dc1-c105-02 -port e0M -role data
  (network port modify)

Error: command failed: Can't change the role of a port that is assigned to a
       lif.

Re: Using e0M as Cluster Management Interface port ?

I agree with Mikhail.  I try to never use e0M and only use the physical port for SP.  The good news on 6200 is that the e0M is now gigabit as well but it doesn't support VLAN tags.. ideally I use the gigabit ports e0a/e0b or a VLAN on the 10GbE NICs.  We can also have secondary cluster and node management interfaces so additional lifs if a customer wants to keep e0M then you can also use the other interfaces as well...one other good reason to not use e0M or to use secondary management is NDMP over the network and since FAS3200 e0M are 100Mbit good to have gigabit or 10 gigabit.

Re: Using e0M as Cluster Management Interface port ?

At this moment, we can only use e0M for cluster management. My question is why node1/e0M has data role and node2/e0M has a node-mgmt role. In data ontap c-mode documentation, cluster_mgmt could failover on data or node-mgmt role lif.

Re: Using e0M as Cluster Management Interface port ?

Then it's a bit more complicated. You should move the node management lif (mgmt1) on stor-dc1-c105-02 to another interface, then you should be able to change the role...

But I strongly suggest that you have two ports in a failover group for the node management. Node management is not just for connections from management console or ssh. For sure it is responsible for sending the autosupports, and I know that in previous versions it was used for some other tasks like NTP time synchronization and AD lookups (that may have been changed in recent versions, I am not sure).  62xx is a serious system for serious people, don't make it less reliable than it could be.

Re: Using e0M as Cluster Management Interface port ?

Hi Scott,

Are you sure that e0M is now gigabit? I think it still was 100Mbit/s on 6280, don't know about 6250...

Re: Using e0M as Cluster Management Interface port ?

Last 6200 I installed was GbE…but depends on when manufactured. It wasn’t advertised but found out trying it out. It may vary but in any new systems you get 6250/6290 it is gigabit. The 6280s I installed mid/late last year also had GbE for e0M. Not listed as GbE but worked at gigabit when plugged in. SP is still 100MBIT though behind that prot.

Re: Using e0M as Cluster Management Interface port ?

Thank you Scott. Good to know.

Re: Using e0M as Cluster Management Interface port ?

Hi,

It's not already in production. We will receive 2 x 10GbE switches in 3 weeks. We try to configure it to learn C-mode. We will decide in 3 weeks if we continue with 7-mode in our datacenter or if we change for C-mode.

So, for my test, i have only e0M/SP (100Mb/s) connected to an admin switch and i created an ifgrp in single mode with e0a and e0b for "data" link. All is fine, exept the fact that i loose cluster management when i do an HA/takeover. Data failover on the good ifgrp even if, as you said, i should create a failover group. I use an ESXi with a VM to test client side.

So i'm going to try to add another port to node-management to see if i can change role of e0M. It's just strange that the documentation shows that the cluster management LIF could have a failover target role of node-management or data. If it was true, it should work even if it's not the best setup.

Thanks