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

■ Improved performance and processing throughput by having Quick I/O files
act as raw devices.
■ Ability to manage Quick I/O files as regular files, which simplifies
administrative tasks such as allocating, moving, copying, resizing, and backing
up Sybase dataservers.
■ Ability to manage Quick I/O files as regular files, which simplifies
administrative tasks such as allocating, moving, copying, resizing, and backing
up DB2 containers.
How Quick I/O improves database performance
Quick I/O's ability to access regular files as raw devices improves database
performance by:
■ Supporting asynchronous I/O
■ Supporting direct I/O
■ Avoiding kernel write locks on database files
■ Avoiding double buffering
About Oracle Disk Manager
Veritas Extension for Oracle Disk Manager enhances file management and disk
I/O throughput. The features of Oracle Disk Manager are optimized for Oracle
10g or later databases in a Veritas File System environment. Oracle Disk Manager
enables you to improve database throughput for I/O intensive workloads with
special I/O optimization.
Veritas Extension for Oracle Disk Manager supports Oracle Resilvering. With
Oracle Resilvering, the storage layer receives information from the Oracle database
as to which regions or blocks of a mirrored datafile to resync after a system crash.
Oracle Resilvering avoids overhead from the Volume Manager Dirty Region
Logging (DRL), which increases performance.
Oracle Disk Manager reduces administrative overhead by providing enhanced
support for Oracle Managed Files. Veritas Extension for Oracle Disk Manager has
Quick I/O-like capabilities, but is transparent to the user. Unlike Veritas Quick
I/O, files managed using Veritas Extension for Oracle Disk Manager do not require
special file naming conventions. The Oracle Disk Manager interface uses regular
database files. If you are upgrading to Oracle10g or later, you should convert from
Quick I/O to Oracle Disk Manager.
35Overview of database accelerators
About Oracle Disk Manager