Veritas File System

When using the Veritas File System on Solaris, HADB writes the message WRN: Direct disk I/O mapping failed to the history files. This message indicates that HADB cannot turn on direct input/output (I/O) for the data and log devices. Direct I/O reduces the CPU cost of writing disk pages. It also reduces overhead of administering “dirty” data pages in the operating system.

To use direct I/O with Veritas File System, do one of the following:

• Create the data and log devices on a file system that is mounted with the option mincache=direct. This option applies to all files created on the file system. Check the mount_vxfs(1M) command for details.

• Use the Veritas Quick I/O facility to perform raw I/O to file system files. For details, see the VERITAS File System 4.0 Administrator’s Guide for Solaris.

These configurations have not been tested with the Sun Java System Application Server.