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