I understand since (from Ketsia Pha) that in OCI Written is from the Volume perspective and Consumed is the ammount of capacity consumed in the aggr or storage pool, so any overhead would be included in Consumed and Consumed is expected to be equal or higer than Written Capacity.
Well, that isn't ideal. I laughed, but that was probably inappropriate. I opened a documentation bug.
We only have this data for a few storage platforms - I think some SVC, and Vmax generation 1 and maybe 2. EMC seems to have de-emphasized this, and I don't think it is available for the Vmax 3 family.
A couple platforms of array purport to know exactly how much data has been written to a volume. This theoretically would line up more closely with the hosts' perspective on how much capacity utilization is occurring.
If OCI can obtain this for block volumes, it would be populated here.