Quiescing a file system allows you to make a backup of the database while it is still running and other programs and their data as well.
The application generally needs to be notified of the quiesce backup operation because all the buffers need to be flushed to disk and any incoming write requests need to be stopped so that a valid backup can be created without stopping the system completely.
Does Linux yet have any support for this sort of thing? I've read that Microsoft Windows has had support for this since Windows Server 2003, and I've seen a few places where they talk about how this can be done with Linux using a VM. But I don't know which specific VMs, if the VMs have to be running on Windows as a host.
Also what about platforms that are above the OS level like Java? Is there any support for quiesce there?