Recovering corrupt virtual machine disks

摘要

A method and system for recovering a corrupt virtual disk is discussed. A request to recover the disk may be received. A recovery snapshot for the last point-in-time the system was stable may be synthesized. A difference may be identified between that recovery snapshot and the corrupt disk. A virtual machine may communicate with both the difference and the corrupt disk, and the difference may be merged with the corrupt disk.

主权项

1. A method for recovering a virtual machine, the method comprising:
receiving a request to recover a corrupt virtual disk, the request comprising a point-in-time; producing a recovery snapshot for the point-in-time; identifying a difference between the recovery snapshot and a backup snapshot at a deduplicated storage; adding the difference to a difference list that comprises pointers to difference data, the difference data comprising data that is different between the corrupt virtual disk and the recovery snapshot; identifying an input/output (“IO”) in a recovery system memory; adding the IO to the difference list; identifying a journal entry entered after the backup snapshot was synthesized,
wherein the journal entry includes a record of write transactions; adding the journal entry to the difference list; synthesizing a difference snapshot from the difference list; and exposing the difference snapshot to the virtual machine.