Storage device as buffer for unreliable storage

摘要

A system and method for managing storage of a digital stream including writing data of the stream to a network storage device, while monitoring availability of the network storage device, switching to writing additional data of the stream to a standby storage device while continuing monitoring the availability of the network storage device, if the network storage device becomes unavailable, switching back to writing additional data of the stream to the network storage device while continuing monitoring the availability of the network storage device, when the network storage device becomes available, and writing to the network storage device the additional data that was written to the standby storage device while the network storage device was unavailable, concurrently with the writing of the additional data of the stream to the network storage device.

主权项

1. A method for managing storage of a digital stream, the method comprising:
writing data of the stream to a main storage device, while monitoring availability of the main storage device; switching to writing additional data of the stream to a standby storage device while continuing monitoring the availability of the main storage device, if the main storage device becomes unavailable; switching back to writing additional data of the stream to the main storage device while continuing monitoring the availability of the main storage device, when the main storage device becomes available; and writing to the main storage device the additional data that was written to the standby storage device while the main storage device was unavailable, concurrently with the writing of the additional data of the stream to the main storage device, wherein monitoring availability of the main storage device comprises:
performing test read and write operations into various locations on the main storage device;measuring response time of the test operations; anddetermining that the main storage device is unavailable if the response time is above a predetermined threshold.