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Question 411 - SK0-005 discussion

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A technician replaces a single faulted disk in the following array RAID 10, Four 15K SAS HDD The technician replaces it from a disk in spare parts, and the array rebuilds the data in a few minutes. After the array rebuild is complete, the system reports the IOPS on the disk array have dropped by almost 60% Which of the following should the technician investigate first?

A.
Check the RAID controller (or background rebuild tasks
Answers
A.
Check the RAID controller (or background rebuild tasks
B.
Check the firmware version on the newly replaced disk.
Answers
B.
Check the firmware version on the newly replaced disk.
C.
Check the RPM speed on the newly replaced disk-
Answers
C.
Check the RPM speed on the newly replaced disk-
D.
Check the cache settings on the RAID controller.
Answers
D.
Check the cache settings on the RAID controller.
Suggested answer: C

Explanation:

In RAID 10 arrays, disk performance is crucial, especially if they are high-speed 15K RPM SAS HDDs, as each disk in the array is part of a mirrored pair that also stripes data with another pair. When replacing a disk, it's essential that the new disk matches the specifications of the others, especially in terms of rotational speed (RPM). If the replaced disk is slower, it can significantly reduce the Input/Output operations per second (IOPS) of the entire array. This is because all disks need to work in tandem, and the slowest disk can become a bottleneck. Thus, checking the RPM of the newly replaced disk is a sensible first step to ensure it matches the performance of the other disks in the array.

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asked 02/10/2024
Mike de Roo
29 questions
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