How do I calculate IOPS?

Typically, when a database administrator suggests that more storage space is needed, they also specify how much IOPS they must have to reach. Now there is such a requirement that 20TB storage space satisfies 4500 Iops+raid 5, how should I calculate? RAID 5 or
How many hard drives are required for RAID 1/0?
First you need to know the I/O Read and write operation (write)
Percentage of the total. Then use the following formula to convert the host's IOPS requirements to the actual IOPS load on the hard disk: RAID type
Formula RAID 5 and 3 drive IOPS = Read ioPS + 4*write ioPS
RAID 6 Drive ioPS = Read ioPS + 6*write ioPS
RAID 1 and 1/0 Drive IOPS = Read ioPS + 2*write ioPS
Assuming that the read/write ratio in 4500 ioPS is 2:1, the different RAID type drive IOPS
The requirements are as follows: RAID 1/0: (2/3) *4500 + (1/3) *4500 = 6000 IOPS
RAID 5: (2/3) *4500 + 1/3) *4500 = 9000 IOPS
RAID 6: (2/3) *4500 + 6* (1/3) *4500 = 12000 IOPS
Then refer to the different types of hard disk ioPS in the table below
parameters, how many hard drives are required:
Hard disk Type ioPS
Fibre Channel 15k rpm 180
SAS 15k RPM 180
Fibre Channel 10k RPM 140
SATA 7.2k RPM 80
SATA 5.4k rpm 40
Flash Drive 2500
Assuming the FC 15K RPM drive is selected: RAID 1/0:6000/180 = 34 Blocks
RAID 5:9000/180 = 50 blocks
RAID 6:12000/180 = 67 Blocks
Note: The actual situation also needs to consider
Vault Drivers (a total of 5) and hot spares (recommended for every 30 hard drives per piece).
Finally, if you use a 600GB FC hard drive to achieve 20TB of free space, RAID 1/0 requires 78 blocks, and RAID 5 requires 42 blocks.
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How do I calculate IOPS?