Messages in this thread | | | Date | Tue, 15 Nov 2005 13:15:54 +0530 | From | Block Device <> | Subject | A standard snapshot notification framework in Linux ? |
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Hi,
does the linux kernel provide a mechanism whereby applications can register themselves to be notified when a snapshot is being taken of the volume they might be writing to.
If there is no such framework then how do backup applications guarantee ( application level ) consistency. I have seen freeze_bdev and friends which work for file systems and how the device mapper uses them. But when it comes to application level consistency, a mechanism is required to give the application a chance to flush & quiesce its writes so that the backup taken will be consistent for the application also. Windows has the VSS ( Volume Shadow Service ) which provides an elaborate framework for this. Is anyone working on something similar for Linux and if not why is it not such a worthwhile idea ?
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