Veritas Volume Replicator Planning and Tuning Guide


Veritas™ Volume Replicator Planning and Tuning Guide


1. Planning and configuring replication
Introduction to planning and configuring replication
Data flow in VVR
About replication in synchronous mode
Data flow when reading back from the SRL
Before you begin configuring
Understanding business needs
Understanding application characteristics
Choosing the mode of replication
Asynchronous mode considerations
Synchronous mode considerations
Asynchronous replication versus synchronous replication
Choosing latency and SRL protection
Planning the network
Choosing the network bandwidth
Choosing the network protocol
Choosing the network ports used by VVR
Configuring VVR in a firewall environment
Choosing the packet size
Choosing the network maximum transmission unit
Sizing the SRL
Peak usage constraint
Synchronization period constraint
Secondary backup constraint
Secondary downtime constraint
Additional factors
2. Tuning replication performance
Overview of replication tuning
SRL layout
How SRL affects performance
Striping the SRL
Choosing disks for the SRL
Mirroring the SRL
Tuning VVR
VVR buffer space
DCM replay block size
Heartbeat timeout
Memory chunk size
UDP replication tuning
Tuning the number of TCP connections
Message slots on the Secondary
VVR and network address translation firewall

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