What is a characteristic of an active/passive storage array configuration?

A.
Read and write I/Os are performed only through the controller that manages the LUN

B.
Host can perform I/Os to its LUNs through any of the available controllers

C.
Read and write I/Os are performed only through active cache

D.
Passive array is used for backup; active array is used for production data

Explanation:
Midrange Storage Systems

Midrange storage systems are also referred to as active-passive arrays and are best suited for
small- and medium-sized enterprise applications. They also provide optimal storage solutions at a
lower cost. In an active-passive array, a host can perform I/Os to a LUN only through the controller
that owns the LUN. The host can perform reads or writes to the LUN only through the path to
controller A because controller A is the owner of that LUN. The path to controller B remains
passive and no I/O activity is performed through this path.
Midrange storage systems are typically designed with two controllers, each of which contains host
interfaces, cache, RAID controllers, and interface to disk drives.
Midrange arrays are designed to meet the requirements of small and medium enterprise
application; therefore, they host less storage capacity and cache than high-end storage arrays.
There are also fewer front-end ports for connection to hosts. However, they ensure high
redundancy and high performance for applications with predictable workloads. They also support
array-based local and remote replication.
EMC E10-001 Student Resource Guide. Module 4: Intelligent Storage System