Veritas Storage Foundation™ for Oracle 5.0.1 Administrator's Guide

Using Veritas Concurrent

I/O

This chapter includes the following topics:

■ About Concurrent I/O

■ Enabling and disabling Concurrent I/O

About Concurrent I/O

Veritas Concurrent I/O improves the performance of regular files on a VxFS file

system without the need for extending namespaces and presenting the files as

devices. This simplifies administrative tasks and allows databases, which do not

have a sequential read/write requirement, to access files concurrently. This chapter

describes how to use the Concurrent I/O feature.

Quick I/O is still an alternative solution for DMS tablespaces.

See “About Quick I/O” on page 75.

In some cases (for example, if the system has extra memory), Cached Quick I/O

may further enhance performance.

See “About Cached Quick I/O” on page 101.

If you are using Oracle 8 and do not need file-level tunable caching, you should

use the Concurrent I/O feature. You should use Quick I/O or Cached Quick I/O if

you need file-level tunable caching on Oracle 8. If you are using Oracle9 or Oracle

10, we recommend that you use Veritas Extension for Oracle Disk Manager.

Chapter