Process and apparatus to reduce declared capacity of a storage device by trimming

摘要

Systems, methods, and/or devices are used to reduce declared capacity of non-volatile memory of a storage device in a storage system. In one aspect, the method includes, detecting an amelioration trigger for reducing declared capacity of non-volatile memory of the storage device of the storage system, and in accordance with the detected amelioration trigger, performing an amelioration process to reduce declared capacity of the non-volatile memory of the storage device, the performing including: trimming, in accordance with a trim command received from a host, at least a portion of a set of logical addresses in a logical address space; and reducing declared capacity of the non-volatile memory of the storage device. In some embodiments, the storage device includes one or more flash memory devices. In some embodiments, the method is performed by the storage device.

主权项

1. A method of managing a storage system, the method comprising:
at a storage device of the storage system:
detecting an amelioration trigger for reducing declared capacity of non-volatile memory of the storage device of the storage system, wherein declared capacity is storage capacity available to a host;in accordance with the detected amelioration trigger, performing an amelioration process to reduce declared capacity of the non-volatile memory of the storage device, the performing including:
trimming, in accordance with a trim command received from the host, at least a portion of a set of logical addresses in a logical address space; andreducing declared capacity of the non-volatile memory of the storage device;prior to detecting the amelioration trigger, detecting a first wear condition of the non-volatile memory of the storage device, wherein a total storage capacity of the non-volatile memory of the storage device includes declared capacity and over-provisioning; andin response to detecting the first wear condition, performing a remedial action that reduces over-provisioning of the non-volatile memory of the storage device without reducing declared capacity of the non-volatile memory of the storage device.