Highly Available STorage

Highly Available Storage (HAST) is a protocol and tool set for FreeBSD written by Pawel Jakub Dawidek, a core FreeBSD developer.

Original author(s)	Pawel Jakub Dawidek
Written in	C
Operating system	FreeBSD
Type	Distributed storage system
License	FreeBSD License
Website	wiki.freebsd.org/HAST

HAST provides a block device to be synchronized between two servers for use as a file system. The two machines comprise a cluster, where each machine is a cluster node. HAST uses a Primary-Secondary (or Master-Slave) configuration, so only one cluster node is active at a time.

HAST-provided devices appear like disk devices in the /dev/hast/ directory in FreeBSD, and can be used like standard block devices. HAST is similar to a RAID1 (mirror) where each RAID component is provided across the network by one cluster node.^[1]

See also

• Network block device
• DRBD (Distributed Replicated Block Device)