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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 ? Regards BD - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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