However, to provide true
redundancy, the nodes should not be connected to the same SAN.
You might choose CCR for your deployment because:
??‘ High availability is required for both hardware and Exchange data.
??‘ Eliminate all single points of failure without third - party software
??‘ Ability to use low - cost DAS storage
??‘ Ability to use a variety of hardware ??” not restricted to WHCL certification
Next is Local Continuous Replication, which is another continuous replication architecture.
Local Continuous Replication
Local Continuous Replication (LCR) is similar to CCR, except it requires only one server. This provides
data protection only; because there is only one server, clustering LCR is not supported. Figure 12 - 2
illustrates a single LCR server design.
Chapter 12: Working with Continuous Replication
331
LCR provides a great way to provide quick recovery for one or more storage groups, with the only costs
being additional disk and processor power. LCR takes approximately 20 percent more CPU processing to
handle the log file verification and log file replay. It is also suggested to use an additional 1 gigabyte of
RAM in this configuration.
The storage group configuration is the same as CCR, one database per storage group. Unlike CCR, it is
possible to enable LCR on per storage group basis.
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