| 主权项 |
1. A computer memory that stores computer-executable instructions that, when executed, cause a computer system to perform a method comprising:
detecting an attempt to write to a block of data in a first volume of data by a first application, wherein a copy-on-write snapshot volume is associated with said first volume, wherein said snapshot volume does not include a copy of said block of data, and wherein said snapshot volume includes a pointer that points to said block of data in said first volume; prior to performing a copy-on-write operation by a snapshot driver to said snapshot volume for said block of data, accessing an indicator associated with said block of data in response to said attempt to write to said block of data by said first application, wherein a value of said indicator is set to a first value by a second application via said snapshot driver when said block of data is not of interest to said second application or said block of data was read by said second application prior to said attempt to write to said block of data by said first application; and determining, based on said value of said indicator, whether said copy-on-write operation is to be performed by said first application for said block of data in response to said attempt to write by said first application, wherein said copy-on-write operation is not performed by said first application if said indicator is set to said first value. |
