METHOD FOR HOT I/O SELECTIVE PLACEMENT AND METADATA REPLACEMENT FOR NON-VOLATILE MEMORY CACHE ON HYBRID DRIVE OR SYSTEM

摘要

The present invention describes a method for hot I/O selective placement, metadata organization and replacement on a hybrid drive or a system comprising a non-volatile memory (NVM) and disk media. The method includes sorting metadata on the NVM based on frequency and/or number of I/O requests. The method includes identifying hot data and cold metadata on the NVM and the disk media in response to the sorting of the metadata. The method further includes evicting cold metadata from NVM to disk while picking hot data for caching by moving from the disk media to the NVM.