Patent ID: 8549220

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 indicates 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; scanning the plurality of strides based on a schedule to identify one or more tracks for destaging; 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 NVS is about 90% full or greater; and not performing an operation to destage on the selected track identified during the scanning, if the multi-update bit of the selected stride on the selected track is set to indicate the selected track is not is part of the working set or if the NVS is less than 90% full.