What is the disk load at peak activity for a RAID 6 configuration?

An application generates 4200 small random I/Os at peak workloads with a read/write ratio of 2:1 .

What is the disk load at peak activity for a RAID 6 configuration?
A . 2800
B . 5600
C . 8400
D . 11200

Answer: D

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Anton Kirihettige
Anton Kirihettige
1 month ago

Calculating Disk Load for RAID 6:Here’s how to calculate the disk load at peak activity for a RAID 6 configuration:

  1. Separate reads and writes:
  • Total I/Os: 4200
  • Read/write ratio: 2:1
  • Reads: 4200 * (2/3) = 2800
  • Writes: 4200 * (1/3) = 1400
  1. Consider RAID 6 write penalty:
  • RAID 6 writes involve reading multiple data and parity blocks, then calculating and writing new parity blocks. This creates a write penalty of 2x compared to RAID 0.
  1. Calculate total disk load:
  • Disk Load = Reads + (Writes * Write Penalty)
  • Disk Load = 2800 + (1400 * 2)
  • Disk Load = 2800 + 2800
  • Disk Load = 5600 I/Os

Therefore, the disk load at peak activity for a RAID 6 configuration is 5600 I/Os.
Important Note: This calculation assumes equal read and write access times. In reality, random I/Os can be slower than sequential I/Os, and performance might be further impacted by specific workload characteristics and hardware limitations.