what should I do to make NAS volume writable again if it is completely full with data and Snapshot copies? I guess, I should delete Snapshot copies and remove data from active file system? Is it enough? Is there anything what should be done with mirror relationships?
Hi @AlexDawson, thank you so much for your input. Our version is for both systems NetApp Release 9.10.1.
My last concern is about deleting data from the full volume including snapshot copies. Once I read, that if I deleted data from the active file system, there would be no space increase because data are referenced within the snapshot copies. So, data are kept due to snapshot copies. Is that true or is that an exceptional situation?
Since you're running 9.10, you will be using XDP for snapmirror relationships, which means you don't have to have the same snapshots on both sides, as long as there is one in common. Have a read of the documentation at https://docs.netapp.com/us-en/ontap/data-protection/index.html and let us know if you have any questions. The "snapmirror technical details" section of that is also really helpful.
Deleting active file system will not reflect as free space until the snapshots holding that data are either manually deleted or automatically roll off (auto delete) based off your snapshot policy. Manually deleting snapshots is the quickest and most direct way to immediately reclaim some space.
I would also suggest looking at autogrow for your volumes.