Veritas Storage Foundation™ for Oracle 5.0.1 Administrator's Guide

■ Resilience class: Each class consists of non-mirrored volumes, mirrored
volumes, and n-way mirrored volumes.
For example, a database is usually made up of data, an index, and logs. The
data could be set up with a three-way mirror because data is critical. The index
could be set up with a two-way mirror because the index is important, but can
be recreated. The logs are not required on a daily basis and could be set up
with no mirroring.
Dynamic Storage Tiering (DST) policies control initial file location and the
circumstances under which existing files are relocated. These policies cause the
files to which they apply to be created and extended on specific subsets of a file
systems's volume set, known as placement classes. The files are relocated to
volumes in other placement classes when they meet specified naming, timing,
access rate, and storage capacity-related conditions.
In addition to preset policies, you can manually move files to faster or slower
storage, when necessary. You can run reports that list active policies, display file
activity, display volume usage, or show file statistics.
Database Dynamic Storage Tiering building blocks
To use Database Dynamic Storage Tiering, your storage must be managed using
the following features:
■ VxFS multi-volume file system
■ VxVM volume set
■ Volume tags
■ Dynamic Storage Tiering policies
About VxFS multi-volume file systems
Multi-volume file systems are file systems that occupy two or more virtual volumes.
The collection of volumes is known as a volume set, and is made up of disks or
disk array LUNs belonging to a single Veritas Volume Manager (VxVM) disk group.
A multi-volume file system presents a single name space, making the existence
of multiple volumes transparent to users and applications. Each volume retains
a separate identity for administrative purposes, making it possible to control the
locations to which individual files are directed. This feature is available only on
file systems using disk layout Version 6 or later.
See “Converting a VxFS file system to a VxFS multi-volume file system” on page 191.
See the fsvoladm(1M) manual page.
Using Database Dynamic Storage Tiering
About Database Dynamic Storage Tiering
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