Chapter 9. Disk Bottlenecks
This chapter describes major bottlenecks related to the HP-UX disk I/O subsystem. A review of some of the basic concepts of disk I/O for HP-UX is followed by a description of typical symptoms, techniques for diagnosing them, and methods for tuning. Here are the topics:
Review of Disk Hardware and I/O concepts
Disks and Disk arrays
Logical Volume Manager (LVM) Concepts
VxVM Volume Manager Concepts
Shared-Bus Access Considerations
File Systems and the Kernel
File System Types
Disk Metrics
Types of Disk Bottlenecks
Expensive System Calls
Tuning Disk Bottlenecks
Database Issues
Disk-Related Tuneable Parameters
Dealing with I/O often involves many choices. The wisdom of Rule #2 is especially good to remember in this arena: “Performance ...
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