公开(公告)号：US20230273753A1

公开(公告)日：2023-08-31

申请号：US18168844

申请日：2023-02-14

Applicant: NetApp, Inc.

Inventor： Sangramsinh Pandurang Pawar ,  Per Olov Wahlstrom ,  William Derby Dallas ,  Houze Xu ,  Ruitao Duan ,  Rajesh Rajaraman

IPC: G06F3/06 ,  G06F9/455

CPC classification number: G06F3/0662 ,  G06F9/45558 ,  G06F3/0604 ,  G06F3/0679 ,  G06F2009/45583

Abstract: Systems and methods for flushing an operation log journal to both ephemeral storage and persistent storage during a shutdown sequence of a virtual storage system to minimize data-loss scenarios are provided. According to one embodiment, the shutdown or reboot scenarios that result in loss of data are minimized by using persistent storage as a backup to ephemeral storage when the scenario results in rehosting of virtual storage system. For example, responsive to an event indicative of an imminent shutdown or reboot of the virtual storage system, vNVRAM memory may be flushed to both ephemeral storage and persistent storage (e.g., a boot disk). In this manner, when the virtual storage system is rehosted after an unplanned shutdown or reboot resulting from an unrecoverable host error (other than an unrecoverable hardware failure), the operation log journal may be recovered from persistent storage to facilitate vNVRAM replay and avoid data loss.