Local direct storage class memory access

摘要

A queued, byte addressed system and method for accessing flash memory and other non-volatile storage class memory, and potentially other types of non-volatile memory (NVM) storage systems. In a host device, e.g., a standalone or networked computer, having attached NVM device storage integrated into a switching fabric wherein the NVM device appears as an industry standard OFED™ RDMA verbs provider. The verbs provider enables communicating with a ‘local storage peer’ using the existing OpenFabrics RDMA host functionality. User applications issue RDMA Read/Write directives to the ‘local peer (seen as a persistent storage) in NVM enabling NVM memory access at byte granularity. The queued, byte addressed system and method provides for Zero copy NVM access. The methods enables operations that establish application private Queue Pairs to provide asynchronous NVM memory access operations at byte level granularity.

主权项

1. A computing system comprising:
a local non-volatile memory (NVM); and a host processing unit in communication with said NVM; an NVM device driver as a NVM verbs provider element for accessing the local NVM via a set of command queues, wherein NVP verbs are loaded directly in both an operating system O/S and NVM device driver components to enable direct access to the local NVM, wherein said host processing unit is configured to perform a method to:
embed, in said computing system, a virtual representation of a remotely networked peer device configured to communicate in accordance with a remote direct memory access (RDMA) infrastructure for data storage and transfer among multiple networked devices, said RDMA infrastructure for data storage and transfer among multiple networked devices operating according to a switched fabric technology infrastructure for a local NVM using RDMA directives at byte length granularity;establish, via said embedded virtual representation of said remotely networked peer device, a RDMA infrastructure interface between an application run by said host processing unit and said local NVM, said interface comprising said NVM device driver;register said local NVM with said remote direct memory access (RDMA) infrastructure for read and write local NVM access, andprocess received RDMA switched fabric technology infrastructure Read directives to read data via said interface from said local non volatile memory at said byte length granularity, andprocess received RDMA switched fabric technology infrastructure Write directives to write data via said interface to said local non volatile memory at said byte length granularity, wherein to process said Read directives and Write directives comprises translating said directives into a format for use by said NVM verbs provider to transfer data directly between a registered buffer in the local NVM to another registered buffer in a virtual memory associated with the host processing unit, said Read directives and Write directives including an address in said local NVM where to start reading/writing, and an address of a user memory buffer where the data bytes are to be transferred from/to, and the length (in byte(s)) of the data being transferred.