Veritas Storage Foundation™ for Oracle 5.0.1 Administrator's Guide

sizes. Put the most frequently accessed tables or tables that are accessed
together on separate striped volumes to improve the bandwidth of data transfer.
See “About tuning VxVM ” on page 299.
Creating a volume
Veritas Volume Manager uses logical volumes to organize and manage disk space.
A volume is made up of portions of one or more physical disks, so it does not have
the limitations of a physical disk.
For databases where the data storage needs to be resilient and the data layout
needs to be optimized for maximum performance, we recommend using VxVM.
The striping and mirroring capabilities offered by a volume manager will help
you achieve your manageability, availability, and performance goals.
After you decide on a volume layout, you can use the vxassist command to create
the volume.
Before creating a volume, make sure the following conditions are met:
■ Creating a volume requires a disk group name, volume name,
volume size, and volume layout. You will also need to know subdisk
names if you are creating a striped volume.
■ Striped or mirrored volumes require at least two disks.
■ Striped pro and concatenated pro volumes are mirrored by default,
so a striped pro volume requires more disks than an unmirrored
striped volume and a concatenated pro volume requires more disks
than an unmirrored concatenated volume.
■ You cannot use a striped pro or concatenated pro volume for a
root or swap volume.
■ A RAID-5 volume requires at least three disks. If RAID-5 logging
is enabled, a RAID-5 volume requires at least four disks.
RAID-5 mirroring is not supported.
Usage notes
53Setting up databases
Creating a volume