American Megatrends Assigned Two Patents

Using solid state device as caching medium
with ead-modify-write  offload algorithm to assist snapshots
American Megatrends, Inc., Norcross, GA, has been assigned a patent (10,114,566) developed by Chatterjee, Paresh, Fremont, CA, Subramanian, Srikumar, Suwanee, GA, Ramasamy, Senthilkumar, Duluth, GA, and Ganapathy, Narayanaswami, Newark, CA, for “systems, devices and methods using a solid state device as a caching medium with a read-modify-write offload algorithm to assist snapshots.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A method for offloading RMW operations on a volume of a storage system to a caching medium includes providing an SSD cache, a data structure for managing the SSD cache and cache headers for managing cache lines. The method also includes maintaining cache headers for cache lines corresponding to a same chunk of the volume as a group, creating a snapshot of the volume and, after creating the snapshot, receiving a write I/O operation directed to a portion of the same chunk. The method further includes allocating a new RMW header for the write I/O operation, maintaining the new RMW header in a new group, performing the write I/O operation on the SSD cache, allocating an old RMW header for the group, maintaining the old RMW header with the group and providing a link between the new and old RMW headers.”

The patent application was filed on May 4, 2016 (15/145,878).

Using solid state device as caching medium
with SSD filtering or SSD pre-fetch algorithm
American Megatrends, Inc., Norcross, GA, has been assigned a patent (10,108,344) developed by Chatterjee, Paresh, Fremont, CA, Subramanian, Srikumar, Suwanee, GA, Ganapathy, Narayanaswami, Newark, CA, and Ramasamy, Senthilkumar, Duluth, GA, for “systems, devices and methods using a solid state device as a caching medium with an SSD filtering or SSD pre-fetch algorithm.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A method for determining when to load read I/O operations into an SSD cache medium for a physical storage medium of a data storage system can include maintaining an SSD filter bitmap with a plurality of bits, where each of the bits corresponds to a respective data block of the physical storage medium. The method can also include initially setting each of the bits to a first predetermined value, receiving a first read I/O operation directed to a particular data block of the physical storage medium and, in response to receiving the first read I/O operation, setting a bit corresponding to the particular data block to a second predetermined value. The method can further include receiving a second read I/O operation directed to the particular data block and, in response to receiving the second I/O operation, loading data for the particular data block into the SSD cache medium.”

The patent application was filed on May 3, 2016 (15/145,099).