SK0-003 · Question #180
A new server has ten 250GB drives ordered with it. An administrator needs to create two arrays, one for the operating system and the other for the storage array. The operating system array needs to be
The correct answer is A. OS: RAID 1 with two 250GB hard drives Storage: RAID 5 with eight 250GB drives. Option A optimally configures the server with two drives in RAID 1 for the OS, providing 250GB fault-tolerant storage, and eight drives in RAID 5 for the data, offering 1.75TB of fault-tolerant storage with decent performance and ample room for growth.
Question
A new server has ten 250GB drives ordered with it. An administrator needs to create two arrays, one for the operating system and the other for the storage array. The operating system array needs to be able to hold 25GB of data, fault tolerant, and have the least amount of unused drive space. The storage array must be able to hold at least 600GB of data, be fault tolerant, and have decent performance. The storage array should contain room for the data to double over the upcoming year. There will be available spare parts on hand to support this server in the event of a failure. Which of the following RAID configurations would BEST suit the needs for this server?
Options
- AOS: RAID 1 with two 250GB hard drives Storage: RAID 5 with eight 250GB drives
- BOS: RAID 1 with two 250GB hard drives Storage: RAID 10 with four 250GB hard drives
- COS: RAID 5 with three 250GB hard drives Storage: RAID 5 with seven 250GB hard drives
- DOS: no RAID with one 250GB hard drive Storage: RAID 6 with nine 250GB hard drives
How the community answered
(46 responses)- A54% (25)
- B26% (12)
- C7% (3)
- D13% (6)
Why each option
Option A optimally configures the server with two drives in RAID 1 for the OS, providing 250GB fault-tolerant storage, and eight drives in RAID 5 for the data, offering 1.75TB of fault-tolerant storage with decent performance and ample room for growth.
RAID 1 with two 250GB drives for the OS provides 250GB of fault-tolerant storage, satisfying the 25GB requirement with minimal physical drives. The remaining eight 250GB drives configured as RAID 5 provide (8-1)*250GB = 1.75TB of fault-tolerant storage with decent performance, exceeding the 600GB requirement and providing ample room for data to double to 1.2TB.
While the OS RAID 1 configuration is suitable, a RAID 10 with four 250GB drives for storage would only yield 500GB of usable space, failing to meet the 'at least 600GB' and 'room for data to double' (1.2TB) requirements.
Configuring the OS as RAID 5 with three 250GB drives uses an unnecessary extra drive compared to RAID 1 for the small OS partition, making it less efficient in drive usage for the OS.
An OS array with 'no RAID' is not fault tolerant, directly violating the requirement for the operating system array to be fault tolerant.
Concept tested: RAID configuration, capacity planning, fault tolerance, performance
Source: https://learn.microsoft.com/en-us/windows-server/storage/disk-management/understanding-raid
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