VERITAS Volume Manager 3.5 User's Guide - VERITAS Enterprise Administrator (June 2002)

Chapter 2, Getting Started with VxVM VEA

Performance Tuning

4. If you did not select the Status or Imported attribute, you must enter a number into

the value box. The attribute of the object type you selected will be compared with the

value you enter in the way you selected. If you selected the Status attribute, you will

need to select a value from Unitialized, Healthy, Stopped, Degraded, and Failed.

5. If you selected the Size or Free space attribute, you will also need to deﬁne the unit of

measurement (Sectors, KB, MB, GB, TB).

6. Use the Add and Remove buttons to add and remove search statements.

7. Click the Search Now button to perform the search.

Example:

If you search for a Volume (object type), with a Size (attribute), of greater than (compare),

10 MB(value), the search will only display volumes with a capacity of greater than 10 MB.

8. If you wish to save the search results, click the Save Results button.

- The Save Dialog box appears.Select thepath or folder you want the ﬁle tosave to.

- Enter a name for the ﬁle into the File name ﬁeld.

- Click Save to save the ﬁle and close the dialog box.

Note If you save the ﬁle with the .XML ﬁle extension, the ﬁle will be in XML format.

Performance Tuning

When a program or device uses too much disk I/O, bottlenecks can occur, creating a hot

spot and degradingperformance. You can make adjustments bymoving subdisksfroman

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.