Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

Storage Foundation database accelerators enable you to manage performance for

your database with more precision.

■ To achieve raw device performance for databases run on Veritas File System

file systems, use Veritas Quick I/O.

■ To further enhance database performance by leveraging large system memory

to selectively buffer the frequently accessed data, use Veritas Cached Quick

I/O.

■ To achieve improved performance for DB2 or Sybase databases run on Veritas

File System file systems, without restrictions on increasing file size, use Veritas

Concurrent I/O.

■ To improve Oracle performance and manage system bandwidth through an

improved Application Programming Interface (API) that contains advanced

kernel support for file I/O, use Veritas Oracle Disk Manager (ODM).

■ To enable selected I/O to use caching to improve ODM I/O performance, use

Veritas Extension for Cached Oracle Disk Manager (Cached ODM).

About Quick I/O

Veritas Quick I/O is a VxFS feature included in Veritas Storage Foundation

Standard and Enterprise products that lets applications access preallocated VxFS

files as raw character devices. Quick I/O provides the administrative benefits of

running databases on file systems without the typically associated degradation

in performance.

Using Quick I/O is recommended on DB2 databases prior to DB2 8.1 with FixPak

4. With DB2 8.1 with FixPak 4 or later, you can use the Veritas Concurrent I/O

feature, which provides high-speed access for SMS tablespaces as well as DMS

tablespaces.

Note: Symantec recommends that you use Veritas Extension for Oracle Disk

Manager for Oracle.

See the Storage Foundation: Storage and Availability Management for Oracle

guide.

How Quick I/O works

Veritas Quick I/O supports direct I/O and kernel asynchronous I/O and enables

dataservers to access regular files on a VxFS file system as raw character devices.

The benefits of using Quick I/O are:

Overview of database accelerators

About Quick I/O