Method and system for providing advanced warning to a data stage device in order to decrease the time for a mirror split operation without starving host I/O request processsing

   
   

A method and system for decreasing the time needed for a mirror split operation in a data storage device by preparing for the mirror split operation during a time interval between notification of an intended mirror split operation and the subsequent time of the mirror split operation. In general, local writes are processed preferentially and asynchronously with respect to corresponding mirror writes, but, after receiving a split advance warning, the data storage device controller preferentially processes backlogged mirror writes in order that the mirrored data storage units are nearly consistent at the time that the intended mirror split operation request is received.

Un método y un sistema para disminuir la época necesaria para una operación partida del espejo en un dispositivo de almacenaje de datos preparándose para la operación partida del espejo durante un intervalo del tiempo entre la notificación de una operación partida prevista del espejo y la época subsecuente de la operación partida del espejo. En general, el local escribe se procesa preferencial y asynchronously con respecto al espejo correspondiente escribe, pero, después de recibir una advertencia anticipada partida, el regulador de dispositivo de almacenaje de datos procesa preferencial el espejo reservado escribe para que las unidades de almacenaje de datos reflejadas sean casi constantes en ese entonces que la petición partida prevista de la operación del espejo se recibe.

 
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