Hatteland HD 12T21 STD-xxx-Fxxx, User Manual

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SSD Selection Guide
Appendix
IND100077-130
Calculation of required size of SSD (Multi-Level Cell - MLC) device)
The table below details the write endurance of the Intel® SSD 320 Series in an enterprise environment. Write
endurance is measured while running 100% random 4KB (4096 bytes) writes spanning 100% of the drive using
Iometer.
Write Endurance Specifications
Intel® SSD 320 Series Value in TB (Terabytes)
40 GB 5
80 GB 10
120 GB 15
160 GB 15
300 GB 30
600 GB 60
Formula for calculating disk size:
z
=
y
*
x
Where y = Requested minimum lifetime (with respect to wear out, [year]).
Where x = Data rate (GB /per year).
Where z = Total amount of data written data to SSD during its whole lifetime.
Step-by-Step Calculation
Step 1: Measure (preferred) or estimate data rate y , [GB /per year].
Step 2: Define minimum expected lifetime for SSD device
x
[year].
Step 3: Calculate total amount of data written to the SSD during its whole lifetime, z = y * x .
Step 4: Use table, column 2 , the z value shall be less or equal to the value in the table to achieve requested lifetime.
Write Endurance Specifications
Intel® SSD 320 Series Value in TB (Terabytes)
40 GB 5
80 GB 10
120 GB 15
160 GB 15
300 GB 30
600 GB 60
Step 5: Select the SSD device, column 1 , which corresponds to the selected value in column 2 .
Step 6. Check that the size of the selected SSD is greater than required size of the SSD, if not select the size of the
SSD that match customer requirements.