New versions of two next-gen Linux storage engines may belie fading interest
However, contemporary DevOps culture reflects the main use of Linux, running inside VMs in server farms: deployed rapidly in large numbers, and deleted when they're no longer needed. Software updates are a very frequent event, even multiple times per day. There isn't time to back up all these VMs, update them, and then test if the update worked.
Snapshots use copy-on-write instead. Before applying a software update, the OS instructs the filesystem to redirect writes to a new area of storage, leaving the old versions of the files in a separate area, which thus functions as an immediate stored instance of the state of the filesystem before the update was applied. Instead of copying all theones somewhere else, which is immediate.
Traditional xNix filesystems, such as Linux's ext4 and XFS, can't do this. The only way to perform snapshotting with such a filesystem is by inserting an extra layer of storage management underneath the filesystem, between it and the storage medium, so that the filesystem isn't directly managing physical disks, but virtual storage"volumes".
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