Patent ID: 10776205

Abstract:
Techniques are disclosed for managing data storage. In one embodiment, the techniques determine one or more RAID extents having a disk extent supported by an extent of storage on a storage device in an inoperative state. Each of the RAID extents contains a respective set of disk extents allocated to that RAID extent and each disk extent is supported by an extent of storage on a storage device of the set of storage devices. The techniques also comprise evaluating a set of values, wherein each value indicates, for a corresponding pair of storage devices from the set of storage devices, a number of RAID extents which contain disk extents belonging to both storage devices of the pair. The techniques also comprise selecting, based on the said evaluation and for each of the one or more RAID extents, a free disk extent for facilitating rebuild of that RAID extent, wherein the said free disk extent is supported by an extent of storage of one of the set of storage devices other than one of the storage devices associated with that RAID extent.