100 ssd selection guide appendix, Example (based on intel® ssd 320 series), Example calculation and conclusion – Hatteland Display 26 inch - HD 26T21 MMC (Widescreen) User Manual
Page 100
100
SSD Selection Guide
Appendix
IND100077-130
Example (based on Intel® SSD 320 Series)
A general assessment based on requirements to determine the most suitable SSD device. When these factors are
known or specified in detail, we can calculate and conclude which SSD device is most suitable (see bottom of page).
Question
Client Answer
We need to know how much data is written to disk
(worst case) during a known time period (per second,
minute, hour etc.) and the nature of this data?
Chart Data : 2GB /Week
Log/User Data: : 10kB /Sec
Swap Data : 100kB /Sec
How much space is used on as fixed for your
application?
40GB over : Chart Data Area (typical Chart size is 30GB)
1GB : Log Data and User Data area
4GB : Swap Area
How long time shall this disk work with no problems? 5 years
Example Calculation and Conclusion
Calculation / Estimation of data rate:
Step Factors
Formula
Result
1
Chart Data: 2GB /Week
2GB * 52
= 104 GB /Year
Log data and User Data: 10kB /Sec 10kB * 60 * 60 * 24 * 365
= 315 GB /Year
Swap Data: 100kB /Sec
100kB * 60 * 60 * 24 * 365
= 3.15 TB /Year
Total = 3.57 TB/Year
2
Required lifetime:
5 years
3
Calculate total amount of data
written to the SSD during its whole
lifetime:
3.57TB * 5
= 17.8 TB
4
Select Disk Using Table
Conclusion = 300GB SSD Device shall be used.
Measure of number of write cycles (Intel® Solid-State Drive Toolbox software)
Download Software from:
https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=18455