How VMware snapshots work and how to use them | TechTarget
VMware snapshots can be a lifesaver when you're upgrading or patching applications and servers. If you oversee a virtual environment, it's imperative that you know what snapshots are and how they work. A disk snapshot is a copy of a VM disk file at a certain point in time; it preserves the disk file system and system memory of your VM. You can revert to a snapshot in the event that something goes
FreeBSD UFS/ZFS Snapshot Management Environment
Problem The FreeBSD UFS (both UFS1 and UFS2) and ZFS filesystems provides the possibility to create snapshots of live filesystems. On UFS is already best known (and can be easily used) for allowing fsck(8) to run in the background (see rc.conf variable background_fsck) and to create consistent filesystem dumps (see dump(8) option -L). In ZFS snapshots even can be used with the zfs(8) send and rece
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http://blogs.sun.com/mmusante/entry/rolling_snapshots_made_easy
