Using overload correlations between units of managed storage objects to apply performance controls in a data storage system

A data storage system, comprising:

• processing circuitry;
• a memory coupled to the processing circuitry, the memory storing program code for applying performance controls in the data storage system based on overload correlations between units of managed storage objects (UMOs) which, when executed by the processing circuitry, causes the processing circuitry to:
• detect that a performance indicator for a target UMO is outside an acceptable range, and
• in response to detecting that the performance indicator for the target UMO is outside the acceptable range,
• i) generate an overload correlation between the target UMO and each competing UMO in a set of competing UMOs, wherein each competing UMO potentially shares at least one hardware component with the target UMO, wherein the overload correlation between the target UMO and each competing UMO indicates an amount of correlation between the performance indicator for the target UMO and a performance indicator for the competing UMO, and
• ii) apply a performance control to the throughput of at least one of the competing UMOs responsive to the overload correlations between the target UMO and the competing UMOs, wherein applying the performance control reduces the throughput of the competing UMO by an amount that is based on the size of the overload correlation between the target UMO and the competing UMO to bring the performance indicator for the target UMO within the acceptable range.

A computer program product, comprising:

• a non-transitory computer readable medium storing program code for applying performance controls in a data storage system based on overload correlations between units of managed storage objects (UMOs), which when carried out by processing circuitry, causes the processing circuitry to perform a method of:
• detecting that a performance indicator for a target UMO is outside an acceptable range;
• and
• in response to detecting that the performance indicator for the target UMO is outside the acceptable range,
• i) generating an overload correlation between the target UMO and each competing UMO in a set of competing UMOs, wherein each competing UMO potentially shares at least one hardware component with the target UMO, wherein the overload correlation between the target UMO and each competing UMO indicates an amount of correlation between the performance indicator for the target UMO and a performance indicator for the competing UMO, and
• ii) applying a performance control to the throughput of at least one of the competing UMOs responsive to the overload correlations between the target UMO and the competing UMOs, wherein applying the performance control reduces the throughput of the competing UMO by an amount that is based on the size of the overload correlation between the target UMO and the competing UMO, to bring the performance indicator for the target UMO within the acceptable range.