mbuffer is a tool for buffering data streams with a large set of
unique features:
* direct support for TCP based network targets (IPv4 and IPv6)
* ability to send to multiple targets in parallel (distribution mode)
* support for multiple volumes
* I/O rate limitation
* high/low watermark based restart criteria
* configurable buffer size
* on the fly MD5 hash calculation
* highly efficient, multi-threaded implementation
It is especially useful, if you are writing backups to fast tape drives
or libraries.