Method, system, and program for an adaptor to read and write to system memory

A method, comprising:

• receiving at an adaptor a plurality of blocks of data to write to storage;
• adding the blocks of data to a buffer in the adaptor;
• determining from a processor, by the adaptor, pages in a memory device to store the blocks of data;
• generating, by the adaptor, I/O requests to write the blocks in the buffer to the determined pages, wherein two I/O requests are generated to write to one block split between two pages in the memory device, wherein generating the I/O requests comprises:
• generating an I/O request to write a set of the blocks in the buffer to a first page comprising one of the determined pages in the memory device;
• generating an I/O request to write a first portion of a split block in the buffer following the set of the blocks to the first page in the memory device;
• generating an I/O request to write a second portion of the split block in the buffer to a second page of the determined pages in the memory device, wherein the second portion does not fit into the first page;
• and
• repeating the operations of generating the I/O request to write blocks starting from the second page until I/O requests are generated to consecutively write all the blocks in the buffer to the determined pages;
• and
• executing in the adaptor the generated I/O requests to write the blocks in the buffer to the determined pages in the memory device.

A system in communication with storage, comprising:

• a memory device;
• a processor in communication with the memory device;
• an adaptor in communication with the memory device and the processor and having a buffer, wherein the adaptor is capable of causing operations, the operations comprising:
• receiving a plurality of blocks of data, comprising blocks within a logical track, to write to storage;
• adding the blocks of data to the buffer in the adaptor;
• determining from the processor pages in the memory device to store the blocks of data, wherein the determined pages comprise identifiers of physical pages in the memory device;
• indicating in a data structure in the adaptor a mapping of the blocks in the logical track to the physical pages, wherein consecutive blocks in the logical track are mapped to discontiguous physical pages in the memory device, and wherein the data structure is used to generate I/O requests;
• generating I/O requests to write the blocks in the buffer to the determined pages, wherein two I/O requests are generated to write to one block split between two pages in the memory device;
• and
• executing the generated I/O requests to write the blocks in the buffer to the determined pages in the memory device.

A system, comprising:

• a memory device;
• a processor in communication with the memory device;
• and
• an adaptor in communication with the memory device and the processor and having a buffer, wherein the adaptor is capable of causing operations, the operations comprising:
• receiving a plurality of blocks of data to write to storage;
• adding the blocks of data to the buffer in the adaptor;
• determining from the processor pages in the memory device to store the blocks of data;
• generating I/O requests to write the blocks in the buffer to the determined pages, wherein two I/O requests are generated to write to one block split between two pages in the memory device, wherein generating the I/O requests comprises:
• generating an I/O request to write a set of the blocks in the buffer to a first page comprising one of the determined pages in the memory device;
• generating an I/O request to write a first portion of a split block in the buffer following the set of the blocks to the first page in the memory device;
• generating an I/O request to write a second portion of the split block in the buffer to a second page of the determined pages in the memory device, wherein the second portion does not fit into the first page;
• and
• repeating the operations of generating the I/O request to write blocks starting from the second page until I/O requests are generated to consecutively write all the blocks in the buffer to the determined pages;
• and
• executing in the adaptor the generated I/O requests to write the blocks in the buffer to the determined pages in the memory device.

An article of manufacture comprising at least one of a computer readable storage medium and a hardware device implementing code executed in an adaptor to communicate with a buffer in the adaptor, a processor, and a memory device caching data for a storage and perform operations, the operations comprising:

• receiving a plurality of blocks of data, comprising blocks within a logical track, to write to storage;
• adding the blocks of data to the buffer in the adaptor;
• determining from the processor pages in the memory device to store the blocks of data, wherein the determined pages comprise identifiers of physical pages in the memory device;
• indicating in a data structure in the adaptor a mapping of the blocks in the logical track to the physical pages, wherein consecutive blocks in the logical track are mapped to discontiguous physical pages in the memory device, and wherein the data structure is used to generate I/O requests;
• generating I/O requests to write the blocks in the buffer to the determined pages, wherein two I/O requests are generated to write to one block split between two pages in the memory device;
• and
• executing the generated I/O requests to write the blocks in the buffer to the determined pages in the memory device.

An article of manufacture comprising at least one of a computer readable storage medium and a hardware device implementing code executed in an adaptor to communicate with a buffer in the adaptor, a processor, and a memory device caching data for a storage and perform operations, the operations comprising:

• receiving a plurality of blocks of data to write to storage;
• adding the blocks of data to the buffer in the adaptor;
• determining from the processor pages in the memory device to store the blocks of data;
• generating I/O requests to write the blocks in the buffer to the determined pages, wherein two I/O requests are generated to write to one block split between two pages in the memory device, wherein generating the I/O requests comprises:
• generating an I/O request to write a set of the blocks in the buffer to a first page comprising one of the determined pages in the memory device;
• generating an I/O request to write a first portion of a split block in the buffer following the set of the blocks to the first page in the memory device;
• generating an I/O request to write a second portion of the split block in the buffer to a second page of the determined pages in the memory device, wherein the second portion does not fit into the first page;
• and
• repeating the operations of generating the I/O request to write blocks starting from the second page until I/O requests are generated to consecutively write all the blocks in the buffer to the determined pages;
• and
• executing in the adaptor the generated I/O requests to write the blocks in the buffer to the determined pages in the memory device.