Performing a data write on a storage device

摘要

A method of performing a data write on a storage device comprises instructing a device driver for the device to perform a write to the storage device, registering the device driver as a transaction participant with a transaction co-ordinator, executing a flashcopy of the storage device, performing the write on the storage device, and performing a two-phase commit between device driver and transaction co-ordinator. Preferably, the method comprises receiving an instruction to perform a rollback, and reversing the data write according to the flashcopy. In a further refinement, a method of scheduling a flashcopy of a storage device comprises receiving an instruction to perform a flashcopy, ascertaining the current transaction in relation to the device, registering the device driver for the device as a transaction participant in the current transaction with a transaction co-ordinator, receiving a transaction complete indication from the co-ordinator, and executing the flashcopy for the device.

主权项

1. A method of performing a data write on a storage device comprising:
instructing a device driver for the storage device to perform a data write to the storage device; ascertaining, by the device driver, a current transaction in relation to the storage device; registering the device driver as a transaction participant with a transaction coordinator; executing, by the device driver, a flashcopy of the storage device; performing, by the device driver, the data write on the storage device; and performing a two-phase commit between the device driver and the transaction coordinator comprising:
sending the device driver a prepare message;sending the device driver a commit message;receiving, from the device driver and in response to the commit message, an instruction to obtain the flashcopy; andobtaining, in response to the receiving, the flashcopy.