topic Re: 3 node cluster in ONTAP Discussions

3 node cluster

RAM254 — Sat, 07 Jan 2017 13:12:53 GMT

Hi,

I have 2 node cluster on 8.3 ,can i add additionl one node .

Thanks

Ram

Re: 3 node cluster

aborzenkov — Sat, 07 Jan 2017 14:50:19 GMT

Technically - yes (you may need to add switches etc). But this is not supported.

Re: 3 node cluster

RAM254 — Sun, 08 Jan 2017 08:22:08 GMT

Hi,

Do you mean if odd number of nodes on cluster on tap not supported,even if it is technically possible??

thanks

Re: 3 node cluster

aborzenkov — Sun, 08 Jan 2017 08:29:36 GMT

Supported configurations are - single node cluster and cluster consisting of HA pairs.

Re: 3 node cluster

akv — Thu, 12 Jan 2017 09:34:27 GMT

Hi RAM254,

Adding to aborzenkov coment,

Following are the standard cluster mode configuration.

1) Single node Cluster

2) 2 nodes (switched or switchless cluster)

3) Multiple Nodes in HA Pair ie. at present you can go upto 24 nodes (12 HA Pairs) for NAS and 8 nodes (4 HA Pairs) for SAN Environments.

You should ONLY add HA Pairs to an existing cluster which is greater than 2 nodes as it would help in Takeover and Giveback of the storage if one of the controller in the HA pair fails or goes down for some reason.

In your case, the existing 2 nodes will be in a HA pair (Generally). If node 1's (controller) fails the node 1's storage can be accessed via node 2 (Controller) via MPHA and vice versa.

If you add a singe 3rd node, in a situation where the node 3 (controller) goes down, the node 3's storage will not be accessable as it doesnot have a HA partner leading to outage.

Thank you,

akv

Re: 3 node cluster

SParker — Thu, 22 Jun 2017 20:27:34 GMT

What if the config was reverses and you have a single node cluster that is serving DR ops?

What is the best practice to get the single node to be part of a new 2 node cluster in a different chassis?

Build the 2 node cluster on the new chassis then add the single to it?

Spin up one node of the new 2 node chassis to join the single nodes cluster?

End game is to retire the single node chassis allowing all the shelves/disks ownership, ifgrps, lifs, sm relationships to move to the 2 node chassis as an HA Pair.

🙂

Re: 3 node cluster

aborzenkov — Fri, 23 Jun 2017 07:06:49 GMT

I am not aware of any documented way to relocate shelves between different clusters keeping data intact. You can add third node to cluster, but it will require wiping it clean losing configuration.

Re: 3 node cluster

Darkstar — Fri, 23 Jun 2017 07:19:32 GMT

You can do a (disruptive) head upgrade from the single node to one of the new systems configured as single node. Then, when the cluster is running on the new controller, add the second node (HA partner) to it to make it an HA pair.

Or, find a (temporary) second controller of the same model as the single node you have (you can borrow them through your Partner from NetApp, it's called Swing Gear), temporarily make a 2-node cluster out of your single system, and then use the regular way to upgrade your cluster hardware and remove the old controllers

-Michael

Re: 3 node cluster

liuh — Mon, 13 Jan 2025 06:34:34 GMT

The following links are for your reference

How to deploy HA three node configuration

If you add a third node in the case of downtime opportunities will cause downtime

Re: 3 node cluster

Darkstar — Mon, 13 Jan 2025 10:10:41 GMT

Sorry, but this is totally incorrect. The link you posted is for ONTAP Tools for vSphere, not for ONTAP itself.

Please do not post irrelevant answers as these may confuse the OP