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SK0-003 · Question #879

A server administrator has been asked to build an array for a low performance application. The array must support hot-swaps and automatic rebuilds with minimal performance degradation during array reb

The correct answer is C. Bit-level striping with parity. With three disks, 'Bit-level striping with parity' (RAID 3) provides fault tolerance for a single disk failure, supports hot-swaps, and can offer better performance stability during rebuilds compared to RAID 5 for certain workloads.

Server hardware installation and management

Question

A server administrator has been asked to build an array for a low performance application. The array must support hot-swaps and automatic rebuilds with minimal performance degradation during array rebuilds. The administrator only has three disks and a single high performance controller. Which of the following is the BEST RAID solution for the administrator?

Options

  • AStriping with no parity
  • BIndependent disks with dual parity
  • CBit-level striping with parity
  • DStriping with mirroring

How the community answered

(41 responses)
  • A
    20% (8)
  • B
    10% (4)
  • C
    68% (28)
  • D
    2% (1)

Why each option

With three disks, 'Bit-level striping with parity' (RAID 3) provides fault tolerance for a single disk failure, supports hot-swaps, and can offer better performance stability during rebuilds compared to RAID 5 for certain workloads.

AStriping with no parity

Striping with no parity (RAID 0) offers no fault tolerance and therefore does not support automatic rebuilds or protect against disk failure, making it unsuitable for data protection.

BIndependent disks with dual parity

Independent disks with dual parity (RAID 6) requires a minimum of four disks to implement (N+2 parity drives), so it cannot be built with only three disks.

CBit-level striping with parityCorrect

Bit-level striping with parity, commonly known as RAID 3, is suitable for an array with three disks (two for data and one for parity). This configuration provides fault tolerance against a single disk failure and, depending on the controller implementation, can manage rebuilds with less performance impact for specific workloads compared to distributed parity arrays.

DStriping with mirroring

Striping with mirroring (RAID 0+1 or RAID 10) requires a minimum of four disks to implement, making it impossible to build with only three disks.

Concept tested: RAID levels, disk count, and rebuild performance characteristics

Source: https://learn.microsoft.com/en-us/windows-server/storage/disk-management/understanding-raid

Topics

#RAID configuration#Hot-swap#Automatic rebuild#Performance degradation

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