RDF System Management Manual
Table Of Contents
- RDF System Management Manual
- What’s New in This Manual
- About This Manual
- 1 Introducing RDF
- RDF Subsystem Overview
- RDF Processes
- RDF Operations
- Reciprocal and Chain Replication
- Available Types of Replication to Multiple Backup Systems
- Triple Contingency
- Loopback Configuration (Single System)
- Online Product Initialization
- Online Database Synchronization
- Online Dumps
- Subvolume- and File-Level Replication
- Shared Access DDL Operations
- EMS Support
- SMF Support
- RTD Warning Thresholds
- Process-Lockstep Operation
- Support for Network Transactions
- RDF and NonStop SQL/MX
- Zero Lost Transactions (ZLT)
- Monitoring RDF Entities With ASAP
- 2 Preparing the RDF Environment
- 3 Installing and Configuring RDF
- 4 Operating and Monitoring RDF
- 5 Managing RDF
- Recovering From File System Errors
- Handling Disk Space Problems
- Responding to Operational Failures
- Stopping RDF
- Restarting RDF
- Carrying Out a Planned Switchover
- Takeover Operations
- Reading the Backup Database
- Access to Backup Databases in a Consistent State
- RDF and NonStop SQL/MP DDL Operations
- RDF and NonStop SQL/MX Operations
- Backing Up Image Trail Files
- Making Online Dumps With Updaters Running
- Doing FUP RELOAD Operations With Updaters Running
- Exception File Optimization
- Switching Disks on Updater UPDATEVOLUMES
- 6 Maintaining the Databases
- 7 Online Database Synchronization
- 8 Entering RDFCOM Commands
- 9 Entering RDFSCAN Commands
- 10 Triple Contingency
- 11 Subvolume- and File-Level Replication
- 12 Auxiliary Audit Trails
- 13 Network Transactions
- Configuration Changes
- RDF Network Control Files
- Normal RDF Processing Within a Network Environment
- RDF Takeovers Within a Network Environment
- Takeover Phase 1 – Local Undo
- Takeover Phase 2 – File Undo
- Takeover Phase 3 – Network Undo
- Takeover Phase 3 Performance
- Communication Failures During Phase 3 Takeover Processing
- Takeover Delays and Purger Restarts
- Takeover Restartability
- Takeover and File Recovery
- The Effects of Undoing Network Transactions
- Takeover and the RETAINCOUNT Value
- Network Configurations and Shared Access NonStop SQL/MP DDL Operations
- Network Validation and Considerations
- RDF Re-Initialization in a Network Environment
- RDF Networks and ABORT or STOP RDF Operations
- RDF Networks and Stop-Update-to-Time Operations
- Sample Configurations
- RDFCOM STATUS Display
- 14 Process-Lockstep Operation
- Starting a Lockstep Operation
- The DoLockstep Procedure
- The Lockstep Transaction
- RDF Lockstep File
- Multiple Concurrent Lockstep Operations
- The Lockstep Gateway Process
- Disabling Lockstep
- Reenabling Lockstep
- Lockstep Performance Ramifications
- Lockstep and Auxiliary Audit Trails
- Lockstep and Network Transactions
- Lockstep Operation Event Messages
- 15 NonStop SQL/MX and RDF
- Including and Excluding SQL/MX Objects
- Obtaining ANSI Object Names From Updater Event Messages
- Creating NonStop SQL/MX Primary and Backup Databases from Scratch
- Creating a NonStop SQL/MX Backup Database From an Existing Primary Database
- Online Database Synchronization With NonStop SQL/MX Objects
- Offline Synchronization for a Single Partition
- Online Synchronization for a Single Partition
- Correcting Incorrect NonStop SQL/MX Name Mapping
- Consideration for Creating Backup Tables
- Restoring to a Specific Location
- Comparing NonStop SQL/MX Tables
- 16 Zero Lost Transactions (ZLT)
- A RDF Command Summary
- B Additional Reference Information
- C Messages
- D Operational Limits
- E Using ASAP
- Index
HP NonStop RDF System Management Manual—524388-003
4-1
4 Operating and Monitoring RDF
To operate and monitor RDF, you enter commands through two online utilities: the
RDFCOM and RDFSCAN interactive command interpreters. Through these utilities,
you initiate communication with RDF, request various RDF operations or information
displays, and terminate communication with the subsystem. This section, which is
intended for system operators, explains how to use these utilities by focusing on the
following topics:
•
Running RDFCOM, including:
•
Command syntax for starting an RDFCOM session
•
Running RDFCOM interactively, noninteractively, and through a command file
•
Using RDFCOM commands
•
Requesting online help for RDFCOM commands
•
Running RDFSCAN
•
Command syntax for starting an RDFSCAN session
•
Using RDFSCAN
•
Using RDFSCAN commands
•
Requesting online help for RDFSCAN commands
•
Performing routine operational tasks
•
Displaying configuration parameters and operating statistics with RDFCOM
•
Changing configuration parameters with RDFCOM
•
Reading (monitoring) EMS messages with RDFSCAN
The syntax and functional descriptions of all RDFCOM and RDFSCAN commands
appear in sections 8 and 9, respectively.
For information about responding to error messages, handling failures, and stopping
and restarting RDF, see Section 5, Managing RDF. For details about the messages
themselves, see Appendix C, Messages.
Running RDFCOM
RDFCOM is an interactive command interpreter through which you begin a session
and enter requests to manage, operate, and control RDF. RDFCOM runs under the
Guardian user interface (normally the TACL command interpreter) to the HP NonStop
Kernel operating system. To initiate communication with RDFCOM, enter the keyword
RDFCOM at the current TACL prompt. This begins an RDFCOM session that lets you
enter RDFCOM commands interactively, noninteractively, or through a command file,
as explained shortly.