Abstract: Embodiments of the present disclosure provide a method and an apparatus for storage management. For example, there is provided a method comprising: creating a plurality of profiles for address mapping, the profiles comprising a part of mapping relation in the total mapping table and creating an index for a part of the plurality of profiles to accelerate the lookup speed. A corresponding device and computer program product are also disclosed.

Abstract: Embodiments of the present disclosure provide a method of managing a disk pool, the disk pool having a plurality of disks which are divided into a plurality of disk extents, the method comprising: determining the number of input/output (I/O) requests for disk extents in the disk pool within a predetermined period of time; determining respective hotness of the disk extents based on the number of I/O requests; determining hotness of the disks based on the hotness of the disk extents; and determining migration of data in the disk extents based on the hotness of the disk.

Abstract: Embodiments of the present disclosure relate to a method, a device and a computer readable medium for managing a storage system. The method can determine a mapping between a logical storage extent and a plurality of storage devices in a storage pool without storing a table of the mapping. Further, the method can record a new mapping after a storage devices fails and restore the original mapping after the failed storage device is replaced.

Abstract: Implementations of the present disclosure relate to a method and apparatus for handling an error for a drive. The logic space of the drive is divided into a plurality of extents. The method comprises determining a type of errors in response to the errors detected in I/O operations for the drive. The method further comprises determining a drive extent of the plurality of extents of the drive that causes the errors in response to determining that the type of the errors is a soft medium error or a data error, the soft medium error being an error that can be repaired by re-mapping of a failed extent and the data error being an error that is caused by damage of data on the drive. Furthermore, the errors can be handled only with respect to the drive extent that causes the errors.

Abstract: Described are techniques for memory management. An N-level bitmap is received, N>2. A memory pool is partitioned into slots each slot having a corresponding bit in level-1 of the N-level bitmap that indicates whether the slot is used or free. The slots are grouped into a hierarchy including N levels. A first thread receives a first request to allocate a first slot of the memory pool. Responsive to receiving the first request, the first thread performs first processing to allocate the first slot using the N-level bitmap. Allocation requests each to allocate slots from the memory pool are only processed by the first thread. A second thread receives a second request to free a second slot of the memory pool. Responsive to receiving the second request, the second thread performs second processing using the N-level bitmap to free the second slot. Requests to free slots are processed by multiple threads.