SK0-004 · Question #640
A network technician is replacing a failed drive in a RAID 5 array. Over time, access to the volumes in the array has slowed down. The technician wants to increase the speed of the RAID array and…
The correct answer is D. All the drives in the RAID array must be replaced simultaneously. In a RAID array, all member drives must be of the same interface type and ideally matched specifications; replacing only one drive with a different technology like SSD while others remain SAS is not supported.
Question
A network technician is replacing a failed drive in a RAID 5 array. Over time, access to the volumes in the array has slowed down. The technician wants to increase the speed of the RAID array and chooses to replace the 10000rpm SAS drive with a low-latency SSD drive. Which of the following is the problem with this solution?
Options
- ASSD drives cannot be used in RAID arrays
- BPerformance will not be increased
- CSAS drives are faster due to their high spindle speed
- DAll the drives in the RAID array must be replaced simultaneously
How the community answered
(40 responses)- A5% (2)
- B13% (5)
- C3% (1)
- D80% (32)
Why each option
In a RAID array, all member drives must be of the same interface type and ideally matched specifications; replacing only one drive with a different technology like SSD while others remain SAS is not supported.
SSDs can absolutely be used in RAID arrays; many enterprise RAID controllers explicitly support SSD members.
Performance would in fact be increased if the solution were implemented correctly with all matching SSD drives, so this is not the problem.
A 10000 rpm SAS drive is not faster than a low-latency SSD; SSDs have far lower latency and higher throughput than spinning SAS drives.
RAID controllers require all drives within the same array to share the same interface and be compatible with one another; you cannot mix SAS spinning drives and SSD drives in the same RAID 5 array. To take advantage of SSD performance, all drives in the array must be replaced simultaneously with SSDs. Replacing only the failed drive with an SSD leaves the array in an unsupported mixed-drive configuration.
Concept tested: RAID array drive compatibility and replacement requirements
Source: https://www.seagate.com/blog/raid-configuration-tips/
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