Cache writing to zones to maximize write bandwidth

Abstract

Instead of having all zones open across all dies, optimizing caching of non-direct write active zones using a host append point (HAP) for maximum write bandwidth is sufficient. The controller will calculate the write rate for a jumbo device (JD). Based on the JD with lowest total write rate, the controller will assign the JD a new zone. The controller will then determine whether the write rate is either appropriate for a cache write or for a direct write. Based on the determination, the controller will write data to the new zone. If the controller direct writes to the new zone, then the controller will close the zone when the zone is full. If the controller cache writes the data to the new zone, then the controller will copy the zone to the direct write area and return the cache write zone to a zone pool. The controller will reclassify the zone if the initial classification is incorrect.

Dependencies are inferred from the claim text.