[2] It is also supported on AIX, Linux, Solaris, OpenSolaris, SINIX/Reliant UNIX, UnixWare and SCO OpenServer.
[4] He notes in a mailing list that they "finished release 1.0 one year or so later" after starting development of VxFS under a contract with AT&T Corporation in 1990.
[citation needed] The on-disk layout of VxFS is versioned and upgradeable while the file system is mounted.
The parallel mode allows for multiple servers (also known as cluster nodes) to simultaneously access the same file system.
When run in this mode, VxFS is referred to as Veritas Cluster File System.