Abstract: Metadata page prefetch processing for incoming IO operations is provided to increase storage system performance by reducing the frequency of metadata page miss events during IO processing. When an IO is received at a storage system, the IO is placed in an IO queue to be scheduled for processing by an IO processing thread. A metadata page prefetch thread reads the LBA address of the IO and determines whether all of the metadata page(s) that will be needed by the IO processing thread are contained in IO thread metadata resources. In response to a determination that one or more of the required metadata pages are not contained in IO thread metadata resources, the metadata page prefetch thread instructs a MDP thread to move the required metadata page(s) from metadata storage to IO thread metadata resources. The IO processing thread then implements the IO operation using the prefetched metadata.

Abstract: Metadata page prefetch processing for incoming IO operations is provided to increase storage system performance by reducing the frequency of metadata page miss events during IO processing. When an IO is received at a storage system, the IO is placed in an IO queue to be scheduled for processing by an IO processing thread. A metadata page prefetch thread reads the LBA address of the IO and determines whether all of the metadata page(s) that will be needed by the IO processing thread are contained in IO thread metadata resources. In response to a determination that one or more of the required metadata pages are not contained in IO thread metadata resources, the metadata page prefetch thread instructs a MDP thread to move the required metadata page(s) from metadata storage to IO thread metadata resources. The IO processing thread then implements the IO operation using the prefetched metadata.

Abstract: A remote data replication facility includes a primary storage array and a backup storage array, on which tracks of data are replicated from the primary storage array to the backup storage array as they are received by the primary storage array. Remote data verification is implemented on the remote data replication facility by comparing track fingerprints, track temporal write metadata, and track spatial write metadata, for a given track on the primary storage array, with corresponding track fingerprints, track temporal write metadata, and track spatial write metadata, for the given track on the backup storage array. If any difference is determined in the combination of track fingerprints, track temporal write metadata, track spatial write metadata, for a given track, the integrity of the data at the backup storage array is not verified for the track.