Sun Java System Application Server Enterprise Edition 8.1 2005Q2 High Availability Administration Guide

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### 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.

Note –

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

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