Calculation of Disk ioPS

Source: Internet
Author: User

Three factors for calculating disk IOPS: 1, RAID type read and write IOPS calculation formula for different RAID types:

RAID type

Formula

RAID5, RAID3

Drive Iops=read ioPS + 4*write ioPS

RAID6

Drive Iops=read ioPS + 6*write ioPS

RAID1, RAID10

Drive Iops=read ioPS + 2*write ioPS


2. The IOPS value of the hard disk type has different disk type IOPS:

Hard disk Type

IOPS

FC 15K RPM

180

FC 10K RPM

140

SAS 15K RPM

180

SAS 10K RPM

150

SATA 10K RPM

290

SATA 7.2K RPM

80

SATA 5.4K RPM

40

Flash Drive

2500


3, the specific business system read and write ratio two, case

1) Business requirements: 10TB FC 15K rpm storage space, meet 6000 IOPS, calculate RAID5,RAID10 How many hard drives are required?

You first need to know the percentage of read and write operations in I/O. Assume that the read/write ratio in 6000 ioPS is 2:1

The actual IOPS load for different RAID type drive drives is as follows:

RAID10: (2/3) *6000+2* (1/3) *6000= 8000 IOPS

RAID5: (2/3) *6000+4* (1/3) *6000=12000 IOPS

Depending on the IOPS value of the different hard disk types, the number of disks required is calculated:

raid10:8000/180 = 45 Blocks

raid5:12000/180 = 67 Blocks

2) A RAID5, consisting of 5 500G 10K rpm FC disks, to calculate the maximum IOPS supported by this raid and the IOPS available to the front-end application?

First 10K rpm FC disk, the IOPS of a single disk is 140, 5 disk maximum IOPS value is 700.

Assuming a read-write ratio of 2:1, the IOPS available to the front-end application are:

(2/3) *x+4* (1/3) *x = 700

2*x = The ioPS available to the front-end application is 350 for the x=350.

Calculation of Disk ioPS

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