Dynamic storage hierarchy management

A computing device, comprising:

• one or more processors;
• and
• a memory storing modules executable by the one or more processors, the modules perform acts comprising:
• measuring an access characteristic for a data block that is stored in a first medium, the access characteristic of the data block includes a frequency of access for the data block;
• determining a corresponding performance characteristic for each of the first medium and a second medium, each performance characteristic including a static performance characteristic component and a dynamic performance characteristic component;
• and
• moving the data block from the first medium to the second medium when at least one of a first comparison of the static performance characteristic components of the first medium and the second medium or a second comparison of the dynamic performance characteristic components of the first medium and the second medium indicates that the second medium is more suitable for storing the data block having the access characteristic than the first medium,
• moving an additional data block stored on the second medium and having an additional frequency of access that is less than the frequency of access of the data block to the first medium in exchange for moving the data block to the second medium.

A computer-readable memory storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising:

• measuring an access characteristic for a data block that is stored in a first medium;
• determining a corresponding performance characteristic for each of the first medium and a second medium, each performance characteristic including a static performance characteristic component and a dynamic performance characteristic component;
• and
• moving the data block from the first medium to the second medium when at least one of a first comparison of the static performance characteristic components of the first medium and the second medium or a second comparison of the dynamic performance characteristic components of the first medium and the second medium indicates that the second medium is more suitable for storing the data block having the access characteristic than the first medium,
• the static characteristic component of the performance characteristic for the first medium or the second medium includes a factory cost per access and the dynamic characteristic component of the performance characteristic for the first medium or the second medium includes a determined cost per access.