Which statement is true about Software RAID?

Question

Options

• ARuns only in write-through mode.
• BRuns on embedded CPU and memory.
• CRuns on the NVRAM.
• DRuns on a PERC H965.

• A
  4% (2)
• B
  88% (49)
• C
  7% (4)
• D
  2% (1)

Explanation

Software RAID is implemented and managed by the operating system, meaning it relies entirely on the host system's CPU and memory to handle RAID operations like striping, mirroring, and parity calculations - no dedicated hardware controller is involved, which is precisely what distinguishes it from hardware RAID.

Why the distractors are wrong:

• A is false because write-through vs. write-back is a cache policy setting, not a fixed characteristic of software RAID.
• C is wrong because NVRAM (non-volatile RAM, used to protect cached writes) is a feature found in hardware RAID controllers, not software RAID.
• D is the opposite of correct - the PERC H965 is a Dell PowerEdge hardware RAID controller, meaning it runs on its own embedded processor and memory, not the host system's.

Memory tip: Think of it this way - "Software RAID borrows from the host; Hardware RAID brings its own." If it's software, the host CPU and RAM do the work. If it's hardware (like a PERC card), the card has its own embedded CPU and memory onboard.

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