High performance logical device

A system comprising:

• a processor;
• and
• a memory including code stored therein that, when executed by the processor, performs a method of processing an I/O operation comprising:
• receiving, on a host, the I/O operation directed to a target location of a logical device having storage provisioned on a data storage system;
• determining, by the host, a director of the data storage system, wherein the director is designated as a primary director for the logical device and wherein the primary director locally accesses a first cache location of the cache of the data storage system, wherein the first cache location is used to store cache data for the target location of the logical device;
• and
• sending the I/O operation from the host to the data storage system over a path, said path being a connection from the host to the director of the data storage system, wherein the I/O operation writes first data to the logical device and wherein the director stores the first data in the first cache location of a first global memory portion of a plurality of global memory portions, and wherein host-based processing is performed to mirror the first data of the first cache location in another cache location that includes the host performing first processing comprising:
• determining whether the I/O operation is a write operation and whether the logical device, to which the I/O operation is directed, is designated as a high performance logical device;
• and
• responsive to determining the I/O operation is a write operation and the logical device, to which the I/O operation is directed, is designated as a high performance logical device, performing additional processing including sending a second write operation that also writes the first data in the another cache location of another one of the plurality of global memory portions.

A non-transitory computer readable medium comprising code stored thereon, that, when executed, performs a method of processing an I/O operation comprising:

• receiving, on a host, the I/O operation directed to a target location of a logical device having storage provisioned on a data storage system;
• determining, by the host, a director of the data storage system, wherein the director is designated as a primary director for the logical device and wherein the primary director locally accesses a first cache location of the cache of the data storage system, wherein the first cache location is used to store cache data for the target location of the logical device;
• and
• sending the I/O operation from the host to the data storage system over a path, said path being a connection from the host to the director of the data storage system, wherein the I/O operation writes first data to the logical device and wherein the director stores the first data in the first cache location of a first global memory portion of a plurality of global memory portions, and wherein host-based processing is performed to mirror the first data of the first cache location in another cache location that includes the host performing first processing comprising:
• determining whether the I/O operation is a write operation and whether the logical device, to which the I/O operation is directed, is designated as a high performance logical device;
• and
• responsive to determining the I/O operation is a write operation and the logical device, to which the I/O operation is directed, is designated as a high performance logical device, performing additional processing including sending a second write operation that also writes the first data in the another cache location of another one of the plurality of global memory portions.