Datasheet

Intel® Solid-State Drive DC S3500
April 2013 Product Specification
Order Number: 328860-001US 23
Use Case 2 – With a System Not Capable of SMART Commands
1. On a SMART capable system, issue the SMART EXECUTE OFF-LINE IMMEDIATE
(D4h) sub-command 40h to reset the E4h (workload timer) attribute.
2. Move the drive to the system where the workload will be measured (and not
capable of SMART commands).
3. Run the workload to be evaluated for at least 60 minutes. Otherwise the drive
wear attributes will not be available.
4. Do a clean system power down by issuing the ATA STANDBY IMMEDIATE
command prior to shutting down the system. This will store all the drive wear
SMART attributes to persistent memory within the drive.
5. Move the drive to a SMART capable system.
6. Read out the drive wear attributes with the SMART READ DATA (D0h) command
within 60 minutes after power-up.
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 per-
centage wear = 16/1024 = 0.016%.
• Timed Workload Host Read/Write Ratio (E3h) has a normalized value of 80, in-
dicating 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 S3500 implements the following Log Addresses: 00h, 02h, 03h, 06h, and
07h.
DC S3500 implements host vendor specific logs (addresses 80h-9Fh) as read and write
scratchpads, where the default value is zero (0). Intel SSD DC S3500 does not write any
specific values to these logs unless directed by the host through the appropriate
commands.
DC S3500 also implements a device vendor specific log at address A9h as a read-only log
area with a default value of zero (0).