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IOPS = 1/Ts
Ts = S + L + X
L= (0.5/(rpm/60)*1000)
Dr= Disks required
Dc= Disk Compacity
Di= Disk on hand
S= Seek Time
L= Rotational Latency
X= Internal Transfer Rate
Multiply IOPS by 0.7 to find untilization
DC=1000GB/100GB
=10 Disks
Di= 49000/IOPS
IOPS= ((1/Ts)*1000)*0.7
Ts=5+(0.5/(15000/60)*1000)+ 4/40
=5+2+.1
=7.1ms
IOPS= (1/7.1)*0.7
=98.6 IOPS
Di= 49000/98.6
=49.7 (Round Up)
=50
Therefor we need 50 disks to get the best performance and 10 to satisfy the capacity
Dr=Max(10,50)
Ex. Peak Workload = 1200
Raid 1/0 - Write Penalty = 2IOPs
reads= 800 (1200*(2/3))
write = 400 *2 = 800 (1200*(1/3)*2) // *2 is the write penalty
total = 1600IOPS (write+read=total)
Raid 5 - Write Penalty = 4IOPS
Read= 800
Write = 400 * 4 = 1600
Total =2400IOPS
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