Datasheet
Intel® Solid-State Drive DC S3700 Series
Example Calculation of Drive Wear
The following is an example of how the drive wear attributes can be used to evaluate the impact of a
given workload. The Host Writes SMART attribute (E1h) can also be used to calculate the amount of
data written by the host during the workload by reading this attribute before and after running the
workload. This example assumes that the steps shown in “Example Use Cases” on page 18 were
followed to obtain the following attribute values:
• Timed Workload Media Wear (E2h) has a raw value of 16. Therefore, the percentage wear =
16/1024 = 0.016%.
• Timed Workload Host Read/Write Ratio (E3h) has a normalized value of 80, indicating that
80% of operations were reads.
• Workload Timer (E4h) has a raw value of 500. Therefore the workload ran for 500 minutes.
• Host Writes Count (E1h) had a raw value of 100,000 prior to running the workload and a value
of 130,000 at the end of the workload. Therefore, the number of sectors written by the host
during the workload was 30,000 * 65,535 = 1,966,050,000 sectors or 1,966,050,000 *
512/1,000,000,000 = 1,007 GB.
The following conclusions can be made for this example case:
The workload took 500 minutes to complete with 80% reads and 20% writes. A total of 1,007 GB
of data was written to the device, which increased the media wear in the drive by 0.016%. At this
point in time, this workload is causing a wear rate of 0.016% for every 500 minutes, or
0.00192%/hour.
5.4.2 SMART Logs
Intel
®
SSD DC S3700 Series implements the following Log Addresses: 00h, 02h, 03h, 06h, and 07h.
Intel DC S3700 Series implements host vendor specific logs (addresses 80h-9Fh) as read and write
scratchpads, where the default value is zero (0). Intel SSD DC S3700 Series does not write any
specific values to these logs unless directed by the host through the appropriate commands.
Intel DC S3700 Series also implements a device vendor specific log at address A9h as a read-only
log area with a default value of zero (0).
Product Specification January 2015
26 328171-010US