Veritas Storage Foundation™ for Oracle 5.0.1 Administrator's Guide

TYP NAME READ WRITE READ WRITE READ WRITE
vol blop 0 0 0 0 0.0 0.0
vol foobarvol 0 0 0 0 0.0 0.0
vol rootvol 73017 181735 718528 1114227 26.8 27.9
vol swapvol 13197 20252 105569 162009 25.8 397.0
vol testvol 0 0 0 0 0.0 0.0
Additional information is available on how to use the vxstat output to identify
volumes that have excessive activity and how to reorganize, change to a different
layout, or move these volumes.
Additional volume statistics are available for RAID-5 configurations.
See the vxstat(1M) manual page.
See the “Performance Monitoring” section of the “Performance Monitoring and
Tuning” chapter in the Veritas Volume Manager Administrator's Guide.
About tuning VxFS
Veritas File System provides a set of tuning options to optimize file system
performance for different application workloads. VxFS provides a set of tunable
I/O parameters that control some of its behavior. These I/O parameters help the
file system adjust to striped or RAID-5 volumes that could yield performance far
superior to a single disk. Typically, data streaming applications that access large
files see the largest benefit from tuning the file system.
Most of these tuning options have little or no impact on database performance
when using Quick I/O, with the exception of the max_thread_proc parameter.
Other than setting the max_thread_proc parameter, use the general VxFS defaults
when creating a VxFS file system for databases.
See “max_thread_proc” on page 315.
However, you can gather file system performance data when using Quick I/O, and
use this information to adjust the system configuration to make the most efficient
use of system resources.
How monitoring free space works
In general, VxFS works best if the percentage of free space in the file system is
greater than 10 percent. This is because file systems with 10 percent or more of
301Tuning for performance
About tuning VxFS