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Forum Discussion
ReadyNAS 312 Need Help Understanding Snapshots
We're about to pull the trigger on a ReadyNAS 312 with either two 2TB or 4TB drives. We have about 290GB of data files. Ideally we'd like to have daily snapshots, but I'm unsure how much data a snaps...
Glad it helps. Of course tracking all this becomes more difficult as you create more snapshots.
But the principles are the same:
Whenever a shared datablock is deleted in the main folder, it becomes snapshot space.
Whenever a shared datablock is modified in the main folder, CoW creates a new copy of that datablock in the main folder, and the original ends up in one or more snapshots.
It's not a backup, because if there were data corruption in a shared block, then the snapshot and the main folder are both corrupted.
But the principles are the same:
Whenever a shared datablock is deleted in the main folder, it becomes snapshot space.
Whenever a shared datablock is modified in the main folder, CoW creates a new copy of that datablock in the main folder, and the original ends up in one or more snapshots.
It's not a backup, because if there were data corruption in a shared block, then the snapshot and the main folder are both corrupted.
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