HP OpenVMS systems documentation

Contents

Preface
Preface	Preface
Chapter 1
1	Troubleshooting Techniques and Tools
1.1	Using Symptoms to Identify a Problem
1.2	Isolating Problems
1.2.1	Testing Connectivity Between Network Hosts
1.2.1.1	Using ping on a Multihomed Host
1.2.2	Checking the Network Interface Parameters
1.2.3	Displaying and Modifying the Internet-to-Ethernet Translation Tables
1.2.4	Examining Network Statistics
1.2.5	Monitoring Network Traffic
1.2.5.1	Using TCPTRACE
1.2.5.2	Using TCPDUMP
1.2.5.2.1	Building Expressions
1.2.5.2.2	Keywords for Filtering Traces from non-OpenVMS Systems
1.2.5.2.3	Primitive Keywords
1.2.5.2.4	Primitive Expressions
1.2.5.2.5	Accessing Data Inside Packets
1.2.5.2.6	Combining Keywords
1.2.5.3	Analyzing Output
1.2.5.3.1	Link Level Headers
1.2.5.3.2	ARP Packets
1.2.5.3.3	TCP Packets
1.2.5.3.4	UDP Packets
1.2.5.3.5	UDP Name Server Requests
1.2.5.3.6	UDP Name Server Responses
1.2.5.3.7	Sun RPC Requests and Replies
1.2.5.3.8	IP Fragmentation
1.2.5.3.9	Timestamps
1.2.5.4	Restrictions
1.2.5.5	Reducing Discarded Packets
1.2.6	Monitoring Socket Activity
1.2.7	Checking Name Server Operation
1.2.8	Checking the Route to a Remote Host
1.2.9	Checking the Routes Known to a Gateway
1.2.10	Determine Whether Network Services Are Available
1.2.10.1	Displaying the Service Database
1.2.10.2	Displaying Service Attributes
1.2.10.3	Verifying Process Privileges
1.2.10.4	Verifying Account Privileges
1.2.10.5	Looking for OPCOM Messages
1.3	Using Online Help
1.4	Using OpenVMS ANALYZE Extensions
Chapter 2
2	Tuning Techniques
2.1	Subsystem Attributes
2.1.1	Displaying Subsystems and Attributes
2.1.1.1	Static and Dynamic Subsystems
2.1.1.2	Displaying the Attribute Values for a Subsystem
2.1.2	Modifying Subsystem Attribute Values
2.1.2.1	Reconfiguring Attributes
2.1.3	Configuring Attributes
2.1.3.1	Format of the SYSCONFIGTAB File
2.1.3.2	Stanza File Format
2.1.4	Modifying Kernel Subsystems
2.1.5	Modifying Socket Subsystem Attributes
2.1.5.1	Increasing the Maximum Number of Pending TCP Connections
2.1.5.2	Increasing the Minimum Number of Pending TCP Connections
2.1.5.3	Increasing the Maximum Size of a Socket Buffer
2.1.6	Modifying Internet Subsystem Attributes
2.1.6.1	Increasing the Size of a TCP Hash Table
2.1.6.2	Increasing the Number of TCP Hash Tables
2.1.6.3	Increasing the Size of the Kernel Interface Alias Table
2.1.6.4	Increasing the TCP Partial Connection Timeout Rate
2.1.6.5	Slowing TCP Retransmission Rate
2.1.6.6	Enabling the TCP Keepalive Function
2.1.6.7	Increasing the Timeout Rate for TCP Connection Context
2.1.6.8	Disabling Delayed Acknowledgment
2.1.6.9	Modifying the Range of Outgoing Connection Ports
2.1.6.10	Disabling Use of the PMTU Protocol
2.1.7	Displaying Socket Statistics
2.2	Tuning Server Applications
2.2.1	Configuring Memory for High Performance
2.2.2	Logging IP Addresses
2.2.3	Increasing the Auxiliary Server Connection Limit
2.2.4	Increasing the Maximum Number of BG Devices
2.3	Solving Performance Problems
2.3.1	Tuning Recommendations for a Primary Server
2.3.2	Improving Gigabit Ethernet Performance