Dell EMC Specialist – Systems Administrator, Unity XT — Question 10

A customer has a Dell EMC SC9000 array with six SC420 enclosures running SCOS 7.3. The enclosure configuration is as follows:
✑ Two enclosures have write-intensive SSDs
✑ Four enclosures have read-intensive SSDs
What is recommended as a general guideline for making spare drive assignments?

Answer options

• A. 2 spare drives per shelf
• B. Dedicated spares are not required
• C. 2 spares per drive type per array
• D. 1 spare per drive type per shelf

Correct answer: D

Explanation

The correct answer is D, as having one spare for each drive type per shelf ensures that there are enough spares available to quickly replace a failed drive specific to that shelf's workload. Option A suggests an excess number of spares without regard to the drive type, while option B incorrectly implies that no spare drives are necessary. Option C misallocates spares by suggesting a total for the entire array rather than on a per-shelf basis.