Extending ssd longevity

Abstract

A storage appliance includes a first SSD, a second SSD, and a controller. The controller is able to calculate a first utilization parameter of the first SSD and a second utilization parameter of the second SSD. If the first utilization parameter is less than a threshold and the second utilization parameter exceeds the threshold, the controller identifies a data range stored on the first SSD to be removed. The removal of the data range from the first SSD causes the first utilization parameter to exceed the threshold. The controller then migrates the data range from the first SSD to the second SSD.

What is claimed is: 
     
         1 . A storage appliance comprising:
 a first solid state drive (SSD) and a second SSD, each configured to store data; and   a controller configured to:
 calculate a value of a first utilization parameter of the first SSD and determine if the value satisfies a threshold, 
 identify a data range of data stored on the first SSD to be removed, and 
 increase spare area in the first SSD by migrating the data corresponding to the identified data range from the first SSD to the second SSD, 
   wherein the migrating of the data causes the value of first utilization parameter to change and satisfy the threshold.