Identification of Available Memory of a Data Storage Device Attachable as a Memory Device

A memory sub-system, comprising:

• a host interface operable on a connection to a host system;
• volatile memory, wherein the memory sub-system is operable to allocate a portion of the volatile memory to provide memory services to the host system over the connection;
• non-volatile memory operable to provide storage services to the host system over the connection;
• a backup power source;
• and
• a controller configured to:
• receive, via the host interface, a query about capabilities of the memory sub-system in the memory services to the host system over the connection;
• and
• provide, via the host interface, a response to the query, the response including data indicative of the capabilities of the memory sub-system in the memory services to the host system over the connection.

A non-transitory computer storage medium storing instructions which, when executed in a computing system, cause the computing system to perform a method, comprising:

• operating a cache in a host system of the computing system to access memory services provided in the computing system;
• configuring a plurality of queues in a memory of the host system to access storage services provided by a solid-state drive connected to the host system over a computer express link connection;
• allocating, by the solid-state drive, a first portion of memory resources to provide the storage services to the host system over the computer express link connection according to a first protocol of storage access through the queues;
• allocating, by the solid-state drive, a first portion of the memory resources to provide the memory services over the computer express link connection according to a second protocol of cache coherent memory access;
• transmitting, over the computer express link connection from the host system to the solid-state drive, a query;
• transmitting, over the computer express link connection from the solid-state drive to the host system, a response to the query, the response including data identifying memory attachment capabilities of the solid-state drive in providing the memory services according to a second protocol;
• and
• configuring, based on the data, the memory services provided by the solid-state drive to the host system over the computer express link connection.