Method and system for handling random access write requests for a shingled magnetic recording hard disk drive

A method for handling write requests for a shingled magnetic recording (SMR) disk, the method comprising:

• receiving a request to write new data to a block having a virtual block address, where the SMR disk is configured to write data into a plurality of zones subdivided into a plurality of stripes, and where each stripe is subdivided into a plurality of blocks, and where data written within each zone is written sequentially in the zone in one or more next available stripes;
• looking up, in metadata stored in a memory, a first logical stripe identifier corresponding to a virtual stripe identifier associated with the virtual block address;
• controlling the SMR disk to read the stripe corresponding to the first logical stripe identifier, modifying data of the read stripe by replacing previous data in the block with the new data, and controlling the SMR disk to write the modified data of the stripe in a next available stripe on the SMR disk;
• and
• updating the metadata to replace the mapping of the virtual stripe identifier from the first logical stripe identifier to a second logical stripe identifier corresponding to the location of the next available stripe on the SMR disk.

A non-transitory computer-readable storage medium storing instructions that when executed by at least one processor cause the performance of operations for handling write requests for a shingled magnetic recording (SMR) disk, the operations comprising:

• receiving a request to write new data to a block having a virtual block address, where the SMR disk is configured to write data into a plurality of zones subdivided into a plurality of stripes, and where each stripe is subdivided into a plurality of blocks, and where data written within each zone is written sequentially in the zone in one or more next available stripes;
• looking up, in metadata stored in a memory, a first logical stripe identifier corresponding to a virtual stripe identifier associated with the virtual block address;
• controlling the SMR disk to read the stripe corresponding to the first logical stripe identifier, modifying data of the read stripe by replacing previous data in the block with the new data, and controlling the SMR disk to write the modified data of the stripe in a next available stripe on the SMR disk;
• and
• updating the metadata to replace the mapping of the virtual stripe identifier from the first logical stripe identifier to a second logical stripe identifier corresponding to the location of the next available stripe on the SMR disk.