How to recover from failed attempt to switch to a different node in cluster

Ken,

Sorry I forgot "-sys" of hagrp -flush command, but the error did tell you what was wrong and the correct syntax:

VCS WARNING V-16-1-10691 Must specify system name
VCS INFO V-16-1-10601 Usage:
hagrp -flush <group> [-force] -sys <system> [-clus <cluster> | -localclus]

Stuff in square brackets is optional so mandatory args are:

hagrp -flush <group> -sys <system>

You can see from main.cf which objects are groups which are ClusterService and i1025prd, so you cannot use Ora_DiskGroup_Data because this, as you said in your email, is a resource, not a group.  Flush is stopping VCS taking further action so that stuff that is waiting to offline will not continue once diskgroup resource is deleted

Mike