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
Introducing RDF
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Subvolume- and File-Level Replication
Subvolume- and File-Level Replication
By default, RDF provides volume-level protection, wherein changes to all audited files
and tables on each protected primary-system data volume are replicated to an
associated backup-system data volume.
RDF/IMP, IMPX, and ZLT also support subvolume-level and file-level replication. To
use this capability, you supply INCLUDE and EXCLUDE clauses when configuring
updaters to identify specific subvolumes and files you want either replicated or not
replicated.
For information about subvolume-level and file-level replication, see Section 11,
Subvolume- and File-Level Replication.
Shared Access DDL Operations
RDF includes two event messages (905 and 908) that assist you in the proper
performance of NonStop SQL/MP shared access DDL operations on the backup
system. See Performing Shared Access DDL Operations.
EMS Support
RDF/IMP, IMPX, and ZLT all support the Event Management System (EMS). They
direct their command, event, warning, and error messages to an EMS collector in the
form of fully-tokenized messages.
You can view messages in the EMS log online using Viewpoint or any other tool you
normally use for monitoring $0. Note that when you do so you are perusing the entire
EMS log. You can, however, use the standard EMS filter RDFFLTO to isolate RDF
messages into an entry-sequenced file which you then can examine using the
RDFSCAN online utility.
SMF Support
RDF supports the use of the NonStop Storage Management Foundation (SMF) product
on both the primary and backup RDF systems. The database on the primary system
can reside on SMF virtual disks, as can the replicated database on the backup system.
All combinations of replication from physical disk to virtual disk, virtual disk to physical
disk, and virtual disk to virtual disk are supported.
There are some issues and restrictions that you should be aware of before using RDF
in an SMF environment; these are discussed in detail under Using SMF With RDF in
Section 2.