This chapter provides general descriptions and examples. For a description of the command syntax, see the chapter Performance Agent Commands.
When an I/O bottleneck is due to disk fragmentation, the information from the Disk Space Analysis utility can help you to improve system performance. Use the Disk Space report to determine if there is disk fragmentation, the disks on which it occurs, and the files on the disk that are most affected. After you determine the disks that are fragmented, you can compress them using the OpenVMS BACKUP utility.
The Disk Space report can also help you determine if you are getting maximum utilization from your disks by showing any inconsistencies between how a volume is initialized and mounted and how it is used. For example, you can see if the file extension size is too small or too large in relation to the size of most files on the disk. If the extension size is inappropriate, adjusting it may optimize disk utilization.
This section contains the following topics:
Disk Fragmentation Investigation
Determine if Disk Use Corresponds to Initialization
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