Patent attributes
An aspect includes generating a checkpoint for a storage system containing an image for a point in time. An aspect also includes storing, in a reserved area, volume configuration data corresponding to volumes for the point in time, layers of metadata and physical data for the point in time. An aspect further includes creating consistent snapshots for the volumes, destaging a control module journal and persisting a hash tree and dirty tree metadata, destaging a code cache, dumping hash metadata and physical layout metadata to a separate location in the storage and enabling new metadata updates to a default location. An aspect also includes redirecting new data and metadata IOS to stripes reserved during preparation of the separate location relating to the checkpoint and protecting checkpointed data and metadata, and generating a consistent checkpoint copy of a management module repository in the reserved area of storage.
