Hi,
SSM checks the eligibility criteria, which if fails it remains grayed out. For migration there shouldn't be any shars, exports or LUN maps associated with it..
Also please notice that we recommend to use this solution only on secondary volumes and not on primary volumes. Though it works for primary volumes, its not a foolproof mechanism as you need to manually export/map NFS/LUN.
>>Have to remove NMC dataset
You need not delete the dataset, you can break the relationship from ONTAP or induce a disaster on source which will make the secondary volume writable.
>>
2) NMC Secondary Space Management Wizard
Pro: Allows for one click volume migration
Con: Intra-controller only. Requires Source volume to be inaccessible during migration. Requires CIFS / NFS exports to be recreated
This is the reason we recommend it only for migrating secondary volume for which there won't be any exports.
Thanks,
Arun