NDMP snapshots are not getting deleted after retention expire

[Mohi1]

NDMP snapshots are not getting deleted after retention expire,

Currently there is no business impact but there could be potential impact if this issue not addressed on priority

[Adithya_Kameswaran]

Hello, 

Kindly share the output of the below command for us to verify a few attributes for the snapshots to suggest the next steps and assist further: 

::> vol snapshot show -vserver [vserver name] -volume [vol name] -snapshot snapshot* -fields create-time,owners,busy

[liu]

Data ONTAP never clears NDMP sessions created by the DMA  

I don't know your version ,but i think this help you  How to remove stale NDMP sessions - NetApp Knowledge Base