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To calculate disk load i.e. IOPS required by each Raid level.
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(I) Given : 3600 IOPS with 60% Read and 40 % write

To calculate disk load i.e. IOPS required by each Raid level.

Solution:

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(II) Following are the steps for write penalty calculation.

1) Read block to be updated which corresponds to 1 read I/O

2) Read parity concerned to that block which corresponds to 1 read I/O

3) Calculate parity.

4) Write data block which corresponds to 1 write I/O

5) Write penalty which corresponds to 1 write I/O onto the disks.

(III) Read and write penalty for different RAID levels.

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