US Patent 10503437 Distributed service level management with performance resilience objectives

Execution of I/O operations for an application is managed to improve consistency of performance for an I/O performance metric for the application. Such control may be achieved by defining a value for a performance resilience objective (PRO) parameter, and applying the PRO value to I/O requests of the application. The PRO value may define a value indicative of an extent to which I/O performance can deviate from a performance objective (e.g., as defined by a service level) over time; i.e., a tolerance for such deviation. Components of a computer network may be configured to apply PRO values to I/O requests for one or more applications. The PRO values of applications may be distributed to one or more components of a data storage system and one or more components of a host system, and these components may be configured to apply the PRO values to I/O requests of the subject applications.