Logging process in a data storage system

A computer-implemented method for managing a data storage system comprising a set of storage tiers each having different performance characteristics, comprising:

• dividing the set of storage tiers into a plurality of subsets of storage tiers based upon performance characteristics of individual ones of the storage tiers;
• creating, for each one of the plurality of subsets of storage tiers, a separate log file that maintains a history of data changes in the respective subset of storage tiers;
• and
• generating, responsive to a data change in one of set of storage tiers, a log record in a log file associated with the one of the set of storage tiers, wherein
• each storage tier is a collection of one or more storage groups having a similar measure of a performance characteristic.

A computer hardware system for managing a data storage system comprising

• a set of storage tiers each having different performance characteristics, comprising:
• a hardware processor configured to initiate the following operations:
• dividing the set of storage tiers into a plurality of subsets of storage tiers based upon performance characteristics of individual ones of the storage tiers;
• creating, for each one of the plurality of subsets of storage tiers, a separate log file that maintains a history of data changes in the respective subset of storage tiers;
• and
• generating, responsive to a data change in one of set of storage tiers, a log record in a log file associated with the one of the set of storage tiers, wherein
• each storage tier is a collection of one or more storage groups having a similar measure of a performance characteristic.

A computer program product, comprising:

• a hardware storage device having stored thereon computer-readable program code that, when executed by a computer hardware system including a moderating system, causes the computer hardware system to perform:
• dividing the set of storage tiers into a plurality of subsets of storage tiers based upon performance characteristics of individual ones of the storage tiers;
• creating, for each one of the plurality of subsets of storage tiers, a separate log file that maintains a history of data changes in the respective subset of storage tiers;
• and
• generating, responsive to a data change in one of set of storage tiers, a log record in a log file associated with the one of the set of storage tiers, wherein
• each storage tier is a collection of one or more storage groups having a similar measure of a performance characteristic.