Veritas File System 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

VxFS Performance: Creating, Mounting, and Tuning File Systems
Choosing mount Command Options
Chapter 2 33
CAUTION Before using convosync=dsync, convosync=unbuffered, or convosync=direct,
make sure that all applications that use the file system do not require synchronous inode
time updates for O_SYNC writes.