Restoring Virtualized GCU State Information

摘要

Method and apparatus for managing a memory, such as but not limited to a flash memory. In accordance with some embodiments, initial state information is stored which identifies an actual state of a garbage collection unit (GCU) of a memory during a normal operational mode. During a restoration mode after a memory power cycle event, a virtualized state of the GCU is determined responsive to the initial state information and to data read from the GCU. The memory is transitioned from the restoration mode to the normal operational mode once the virtualized state for the GCU is determined.

主权项

1. A method comprising:
storing an actual staleness count for a garbage collection unit (GCU) of a memory during a normal operational mode, the actual staleness count indicating a total number of stale data blocks in the GCU; determining, during a restoration mode after a power cycle event, a virtualized staleness count for the GCU responsive to the actual staleness count, a reverse directory table of the GCU and forward pointer data associated with data blocks written to the GCU; and transitioning the memory to the normal operational mode after the virtualized staleness count is determined.