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A LAN-free backup is a backup of server data to a shared, central storage device without sending the data over the local area network (LAN). It is usually achieved by using a storage area network (SAN).
Note that trivial backup to a dedicated, unshared storage device (such as local tape drive) does not meet the definition.
The goal of LAN-free backup is to reduce the load on LAN and reduce the time it takes to complete the backup. It offers an alternative way of backup than a simple data copy to network-attached storage (NAS) over LAN
It comes in different flavours:
- with backup server: in addition to a shared storage device (usually a traditional tape library), there exists a central server arbitrating access to device (for all the other SAN servers). The central server however, does not handle data stream itself.
- without backup server: the storage facility (usually a virtual tape library, or VTL) is smart enough to handle multiple data accesses without intermediate component.
- Description of Lan-Free Client Data Transfer Operation[permanent dead link]
- IBM Tivoli Storage Manager: LAN/WAN Backup; ServerFree Backup; LANFree Backup; and Split-Mirror Backup - What Does It All Mean?
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