Centera Replication

Ok dumb question that I cant answer for my customer, can anyone tell me why the source and target centeras have identical raw capacities but the target has less
objects and yet 10x the available capacity. customer explains that everything from one is being replicated to the other.

Possible explanations:

- The source cluster is configured for CPP (parity) while the target cluster is CPM (mirroring). CPP will have 7 fragments (objects) while CPM will have 2 for the same stored object. This will create a disparity between used object counts.

- Garbage collection is not running on the source cluster. This could be because it is disabled, is not scheduled to run, or the cluster integrity is incomplete. This could cause disparity in used capacity

- Over protection. This is caused when a node or disk fails and is later revived where the regenerations complete. This can cause disparity in object count and capacity.

- Not all pools are being replicated. This will cause disparity between object counts and capacity.

- Storage strategy is different where single-instancing is allowed on the target but not the source. This will cause disparity in object counts and capacity.

EMC Technical Support should be able to assist in determining the exact causes for the disparity you are seeing. Integrity Checker can be run by Support on both clusters and a caparison made between enumeration clip lists across the clusters. IC will also report over protection and orphans allowing determination for the differences.