Explanation
Common Messaging Interface (CMI): A high speed bus that is used for communication between SPs, such as mirroring write cache or redirecting I/Os from a non-optimized path.

Explanation
Dell PowerStore 1000T supports the addition of a maximum of one expansion enclosure when it has 10 SCM drives in the base enclosure. An expansion enclosure can be added to the base enclosure and allows the system to support additional drives and increase storage capacity.

Explanation
The maximum number of data drives that can be put in to a Dell PowerStore 1000T base enclosure is 21. The Dell PowerStore 1000T has a 2U form factor, and it supports a maximum of 21 drives in the base enclosure.
The drives can be either SAS or NVMe, and it's important to keep in mind that the maximum capacity of the system depends on the type of drives that are used. It's important to note that the PowerStore 1000T supports up to 2 expansion shelves that can hold an additional 21 drives each, for a maximum of 63 drives in total.
Also, the PowerStore 1000T supports up to 4 NVRAM modules that are used to cache metadata and improve performance.

Explanation
https://elabnavigator.emc.com/vault/pdf/EMC_Unity_ESSM.pdf (pag.22)

Explanation
Dell EMC Unity OE version 5.0, asynchronously replicated file resources can also be configured in advanced replication topologies. This allows for configurations such as fan-out and cascading replication at the granularity of a NAS Server and its associated file resources.