NOS 4.0.2 – Exclusive Usage Bytes VS Changed Bytes

Prior to 4.0.2, Only changed bytes existed to help tell the tail of the difference between snapshots and was misleading depending on how you interpret the results. Today both fields exist so you can see how much space the snapshots are taking up and how much IO is going through the system.

Exclusive Usage Bytes:
Total space that can be reclaimed when this snapshot is deleted and garbage collected.
Changed bytes:
Amount of user I/O to the entities in this protection domain between the previous snapshot and this snapshot.


The exclusive bytes field is calculated with the power of MapReduce and stats are fed back to the Prism UI. This particular stat is not real time and takes approximately about an hour to show up.

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