Ditto Blocks - The Amazing Tape Repellent (Flippin' off bits)



Ditto Blocks - The Amazing Tape Repellent (Flippin' off bits)

We use ditto blocks to ensure that the more "important" a filesystem block is (the closer to the root of the tree), the more replicated it becomes. Our current policy is that we store one DVA for user data, two DVAs for filesystem metadata, and three DVAs for metadata that's global across all filesystems in the storage pool.


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