Exclusive ownership of logical address slices and associated metadata

A non-transitory computer readable medium comprising code stored thereon that, when executed, performs a method comprising:

• partitioning a logical address space into a plurality of slices where each of the plurality of slices corresponds to one of a first plurality of logical address subranges of the logical address space;
• forming a plurality of sets, wherein each of the plurality of sets includes a portion of the plurality of slices and includes corresponding metadata objects associated with the portion of slices included in said each set;
• assigning the plurality of sets to a plurality of nodes of a storage system, where each of the plurality of nodes is assigned a single one of the plurality of sets, wherein said each node exclusively owns slices and corresponding metadata objects of said single set assigned to said each node, and wherein said each node exclusively owns logical addresses of slices included in said single set assigned to said one node;
• receiving, from a host at a first of the plurality of nodes of the storage system, an I/O operation directed to a target logical address;
• determining whether the first node or a second of the plurality of nodes exclusively owns a first slice including the target logical address;
• responsive to determining the first node exclusively owns the first slice including the target logical address, the first node performing first processing to service the I/O operation;
• and
• responsive to determining that the second node owns the first slice including the target logical address, the first node performing second processing including:
• forwarding the I/O operation to the second node for servicing;
• receiving, at the first node from the second node, a reply regarding said forwarding;
• and
• responsive to receiving the response, the first node sending a second reply to the host regarding the I/O operation.

A system comprising:

• one or more processors;
• and
• a memory comprising code stored thereon that, when executed, performs a method comprising:
• partitioning a logical address space into a plurality of slices where each of the plurality of slices corresponds to one of a first plurality of logical address subranges of the logical address space;
• forming a plurality of sets, wherein each of the plurality of sets includes a portion of the plurality of slices and includes corresponding metadata objects associated with the portion of slices included in said each set;
• assigning the plurality of sets to a plurality of nodes of a storage system, where each of the plurality of nodes is assigned a single one of the plurality of sets, wherein said each node exclusively owns slices and corresponding metadata objects of said single set assigned to said each node, and wherein said each node exclusively owns logical addresses of slices included in said single set assigned to said one node;
• receiving, from a host at a first of the plurality of nodes of the storage system, an I/O operation directed to a target logical address;
• determining whether the first node or a second of the plurality of nodes exclusively owns a first slice including the target logical address;
• responsive to determining the first node exclusively owns the first slice including the target logical address, the first node performing first processing to service the I/O operation;
• and
• responsive to determining that the second node owns the first slice including the target logical address, the first node performing second processing including:
• forwarding the I/O operation to the second node for servicing;
• receiving, at the first node from the second node, a reply regarding said forwarding;
• and
• responsive to receiving the response, the first node sending a second reply to the host regarding the I/O operation.