can a node pair been move from a cluster to another and keep all the svm and data?

[AllenChang]

If my old hardware will disuse, and use a newer model to replace,

the the FAS model will create a new cluster,

how to move the old cluster's SVM and keep SVM's data and configuration to the new cluster?

[SpindleNinja]

you can't really "merge" 2 separate clusters into one..  

You can however..   Add the new pair to the existing cluster (mixing rules apply depending on model) and migrate data over to the new nodes.  https://docs.netapp.com/us-en/ontap-systems-upgrade/upgrade/upgrade-by-moving-volumes-parent.html

You can also Snapmirror data over to a new cluster.  https://docs.netapp.com/us-en/ontap/data-protection/compatible-ontap-versions-snapmirror-concept.html

[EWILTS_SAS]

You can also use SVM DR to migrate the entire SVM, depending on the versions of code running on the clusters.

[AllenChang]

If I use [cluster join]  or [cluster rejoin] command

Will it destory the old filer's data ?

[EWILTS_SAS]

You can not merge two clusters without losing data.  If you have only external shelves, you *may* be able to cable the shelves to existing heads, import the aggregates and data, and then add the heads to the cluster separately and then recable the shelves back to the original heads.  I haven't done enough research to see if this will work since I've never had to do this.  You will probably want to contract with NetApp Professional Services before attempting something this complex.

[Mjizzini]

Controller hardware upgrade will not need to create new SVMs. You can keep the SVM configuration and move them to the new HW.

Controller hardware upgrade for AFF and FAS systems resolution guide

[wareer]

Beginning with ONTAP 9.10.1, cluster administrators can non-disruptively relocate an SVM from a source cluster to a destination cluster to manage capacity and load balancing, or to enable equipment upgrades or data center consolidations by using the ONTAP CLI.

This non-disruptive SVM relocation capability is supported on AFF platforms in ONTAP 9.10.1 and 9.11.1. Beginning with ONTAP 9.12.1, this capability is supported on both FAS and AFF platforms and on hybrid aggregates.

The SVM’s name and UUID remain unchanged after migration, as well as the data LIF name, IP address, and object names, such as the volume name. The UUID of the objects in the SVM will be different.https://docs.netapp.com/us-en/ontap/svm-migrate/index.html 

[Sanaman]

Is it switched cluster or switch-less cluster? If Switched cluster then easier, just plug-in the new hardware and join the cluster. Add new aggregates to SVM and move the volumes and then lifs. Then remove the old cluster reference from the SVM.