Using SmartTier with solid state disks
The SmartTier feature has been enhanced with the following placement policy features to support SSD-based tiers:
Allowance of fine grained temperatures, such as allowing hours as units for the <IOTEMP> and <ACCESSTEMP> criteria
See Fine grain temperatures.
Support of the Prefer attribute for the <IOTEMP> and <ACCESSTEMP> criteria
See Prefer mechanism.
Provision of a mechanism to relocate based on average I/O activity
See Average I/O activity.
Reduction of the intensity and duration of scans to minimize the impact on resources, such as memory, CPU, and I/O bandwidth
See Frequent scans.
Quick identification of cold files
See Quick identification of cold files.
To gain these benefits, you must modify the existing placement policy as per the latest version of the DTD and assign the policy again. However, existing placement policies continue to function as before. You do not need to update the placement policies if you do not use the new features.
See Example placement policy when using solid state disks
See About SmartTier