VERITAS Volume Manager 3.5 User's Guide - VERITAS Enterprise Administrator (September 2004)

Getting Started with VxVM VEA
Performance Tuning
Chapter 2 39
Performance Tuning
When a program or device uses too much disk I/O, bottlenecks can occur,
creating a hot spot and degrading performance. You can make
adjustments by moving subdisks from an area of high I/O usage to
another disk that has lower usage.
The VxVM statistics function provides I/O statistics to allow you to do
performance tuning to improve overall disk and system performance.
You can improve disk and system performance by identifying I/O
bottlenecks, or hot spots; then moving data among physical drives to
evenly balance the I/O load among the disk drives. This is known as load
balancing.
See also:
• “Real-time Statistics Collection and Display” on page 39
• “Load Balancing” on page 43
• “Disk Failure or Removal” on page 44
• “Disk Phaseout” on page 44
Real-time Statistics Collection and Display
To set up real-time statistics collection and display, you need to “Select
Online Display Options” on page 39.
Select Online Display Options
Use the following procedure to set the display options.
To select the online data display options:
Step 1. Choose Tools > Statistics > Online Data Display Options to
bring up the Online Display Options window.