Highly Available STorage

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

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

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)

References

1. "Solved - How to create RAID1 for a entire disk with UFS and GPT?". The FreeBSD Forums. 2018-08-08. Retrieved 2023-12-13.

External links

• HAST page at FreeBSD wiki
• HAST at FreeBSD HandBook