Storage system and method for performing a targeted read scrub operation during intensive host reads

In a storage system comprising a memory, a method comprising:

• determining whether the storage system is undergoing host reads above a threshold level;
• in response to determining that the storage system is undergoing host reads above the threshold level, performing a targeted read scrub operation, wherein the targeted read scrub operation comprises performing a random read operation of a neighboring wordline to a host- accessed wordline, and wherein the random read operation reads only one state of a plurality of states in memory cells in the neighboring wordline;
• and
• relocating a page identified by the targeted read scrub operation to a new block of the memory.

A storage system comprising:

• a memory;
• means for determining when the storage system is operating in an intensive-host-read mode in a portion of the memory;
• and
• means for performing one of the following targeted read scrub operations in response to determining that the storage system is operating in the intensive-host-read mode in the portion of the memory:
• (i) a periodic read scrub operation of a different portion of the memory, wherein a page is marked for relocation in a relocation queue as a result of the periodic read scrub operation;
• and
• (ii) a random read operation of a neighboring wordline to a host-accessed wordline, wherein the random read operation reads only one state of a plurality of states in memory cells in the neighboring wordline.