ABC.com has requested that you provide the number of physical disks needed to support their
Microsoft Exchange 2003 Storage Groups. ABC.com currently has 12,500 users at 1.2 IOPS and,
at peak activity, up to 10,000 users could be logged on to Exchange. What additional information
is necessary to accurately determine the number of required disk spindles to satisfy the IOPS
requirements of the user?

A.
Size of user mailbox, RAID type and disk speed

B.
Size of usermailbox, read penalty and RAID type

C.
Public folders location and deleted item retention period

D.
Read/write ratio and write penalty

Explanation:
Key phrase is “to meet user IOPS requirements”
[(IOPS x %R) + WP (IOPS x %W)] Physical disk Speed = Required # physical disks