Read i/o processing techniques using remote mapping resolution with logical address space slicing

A system comprising:

• one or more processors;
• and
• one or more memories comprising code stored thereon that, when executed, performs a method comprising:
• receiving, at a first node from a host, a read I/O operation requesting to read content C1 from a first logical address LA1, where the first node and a second node are included in a data storage system;
• determining that LA1 is owned by the first node;
• the first node performing first resolution processing for LA1, wherein the first resolution processing includes the first node mapping LA1 to a first entry E1 of a first metadata (MD) leaf object, wherein E1 includes a first virtual layer block (VLB) address which corresponds to a first VLB of a virtual block layer;
• determining, by the first node, whether the first node or the second node owns the first VLB;
• and
• responsive to determining that the first node owns the first VLB, performing first processing including:
• the first node using the first VLB address to obtain a first physical address or location PA1 on non-volatile storage, wherein C1 is stored at PA1;
• the first node reading C1 from PA1;
• and
• the first node returning C1 to the host in a read I/O response.

A computer-implemented method comprising:

• receiving, at a first node from a host, a read I/O operation requesting to read content C1 from a first logical address LA1, where the first node and a second node are included in a data storage system;
• determining that LA1 is owned by the first node;
• the first node performing first resolution processing for LA1, wherein the first resolution processing includes the first node mapping LA1 to a first entry E1 of a first metadata (MD) leaf object, wherein E1 includes a first virtual layer block (VLB) address which corresponds to a first VLB of a virtual block layer;
• determining, by the first node, whether the first node or the second node owns the first VLB;
• and
• responsive to determining that the first node owns the first VLB, performing first processing including:
• the first node using the first VLB address to obtain a first physical address or location PA1 on non-volatile storage, wherein C1 is stored at PA1;
• the first node reading C1 from PA1;
• and
• the first node returning C1 to the host in a read I/O response.