Patent ID: 8332589

Claim:
In a computing storage environment for destaging data from nonvolatile storage (NVS) to a storage unit, a method for identifying working data on a stride basis by a processor device, comprising: establishing a multi-update bit for each stride of a plurality of strides in a modified cache, wherein the multi-update bit is adapted to indicate a corresponding stride is part of at least one track in a working set, the working set referring to a group of frequently updated tracks; configuring a schedule for scanning the plurality of strides, the schedule being based on a plurality of levels of urgency, wherein the plurality of levels of urgency are active or inactive and include a low level during which destage scans are formed at a first frequency and an emergency level during which destage scans are formed at a second frequency that is more frequent than the first frequency; scanning the plurality of strides based on the schedule to identify one or more tracks for destaging; and performing an operation to destage on a selected track identified during the scanning, if the multi-update bit of a selected stride on the selected track is set to indicate the selected track is part of the working set and if the emergency level of the plurality of levels of urgency is active.