Patent ID: 10592166

Abstract:
An aspect of minimizing read amplification IO where metadata is not in RAM includes reading a l_md_page and corresponding lp_md_page from a storage device in a dual distributed layered architecture. The l_md_page specifies a metadata page that persists in a SSD and having logical addresses of metadata, and the lp_md_page associates logical block addresses with corresponding physical locations for the metadata. An aspect further includes reading data for a redundant array of independent disks (RAID) stripe according to an associated physical offset in the lp_md_page, accessing a stripe counter from the lp_md_page, and comparing the stripe counter from the lp_md_page to a stripe counter held in memory. Upon determining the stripe counter from the lp_md_page is the same, an aspect further includes determining the data is valid and reading the data according to associated physical offset in the lp_md_page and while bypassing a data module for the data.