Virtual disk recovery and redistribution

摘要

Techniques for recovery and redistribution of data from a virtual disk storage system are described herein. In one or more implementations, a storage scheme derived for a virtual disk configuration is configured to implement various recovery and redistribution designed to improve recovery performance. The storage scheme implements one or more allocation techniques to produce substantially uniform or nearly uniform distributions of data across physical storage devices associated with a virtual disk. The allocation facilitates concurrent regeneration and rebalancing operations for recovery of data in the event of failures. Additionally, the storage scheme is configured to implements parallelization techniques to perform the concurrent operations including but not limited to controlling multiple parallel read/writes during recovery.

主权项

1. A method implemented by a computing device, the method comprising:
allocating reserved space for recovery on storage devices during configuration of a virtual disk; distributing client data and redundancy data across the storage devices in accordance with an allocation scheme that facilitates parallel recovery, wherein the allocation scheme represents a combination of multiple individual schemes that are applied selectively to different allocation operations; detecting failure of one or more of the storage devices; and recovering data from the one or more storage devices that fail using parallel tasks and the reserved space to redistribute the data across remaining storage devices that have not failed.