Your customer has established a new virtual pool of storage containing NL-SAS drives in a RAID 5 configuration. Recently they have noticed that performance on the entire array is affected between
1:00AM and 4:00AM.

What information would best indicate the root cause?

A.
More than 21 forced flushes per second

B.
SP utilization greater than 71%

C.
Large sequential writes

D.
HWM set to 60%; LWM set to 40%