Choosing a Connection Medium to Link My Sites

If your server is configured in a clustered environment, set the bitmap mode to 1. If your server is not configured in a clustered environment, you can also choose the bitmap mode setting of 1 to improve error or disaster recovery.

Choosing a Connection Medium to Link My Sites

The primary and secondary sites must be connected by a standard medium that supports TCP/IP. For example, you can use any medium such as ATM, ISDN, Ethernet, Gigabit-Ethernet, or T1 and T3 lines to replicate data. Consider cost, bandwidth, and latency when choosing a connection medium.

The Sun SNDR software uses the maximum network bandwidth available to it. If the Sun SNDR software must share the network connection with other applications, you can use a bandwidth allocator to restrict the bandwidth available to an application.

ATM Link Advantages

ATM is a standards-based high-performance WAN protocol that establishes routes at circuit initialization. Its performance, combined with SONET/SDH’s ring-healing resiliency, have made it the choice of carriers in their core backbone networks.

ATM Quality of Service parameters allow customers to choose the circuit characteristics that best suit their needs and budget. They define how different WAN ports competing for bandwidth should be prioritized relative to each other, each having “virtual paths” through the network fabric. Voice, video, and LAN traffic can move over the same connection as critical remote mirroring connections between primary and recovery sites. ATM switches make these varied protocol adaptations possible.

The Sun SNDR software will operate over any TCP/IP networking technology but has only been qualified on 10, 100, and 1000 Mbit Ethernet and ATM technologies.

Chapter 2 Configuration Considerations 9