Depletable Storage Systems

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Executive Summary

Depletable storage systems use media such as NAND flash that has a limited lifetime, which decreases with more usage. Such systems treat write cycles, in addition to space, as a constrained resource of the system. Depletable storage systems must be equipped to monitor writes, attribute depletion to appropriate applications, and even control the rate of depletion. The authors outline the new functionalities enabled by depletion-aware mechanisms and discuss the challenges in building them. They have traditionally built storage systems that treat space as their primary resource constraint. The notion of "Quota" typically applies to a fixed amount of storage that is allocated to a user.

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