892 9.7 Deploying Local Continuous Replication (LCR)
age. It is faster and more convenient to bring back data online from a rep-
lica than to have to go through a complicated and long restore procedure.
9.7 Deploying Local Continuous Replication (LCR)
LCR is available for all editions of Exchange 2007 and provides a resiliency
option to protect against database failure caused by a disk outage that you
can deploy for small to medium servers at a low price point. You can deploy
LCR on any Exchange 2007 mailbox server except a cluster (CCR or SCC).
Unlike an SCC cluster, you can run the hub transport and Client Access
roles on a server that uses LCR. If you want to deploy a cluster to gain extra
resilience against server failure, then you have the option of deploying a
new CCR server on an MNS cluster or a traditional SCC configuration.
As with other Exchange 2007 servers, you can configure up to 50 stor-
age groups on a mailbox server that uses LCR. You can deploy a mixture of
storage groups, some that use LCR and some that do not. For example, you
might have a storage group configured to use circular logging because it
holds transient data and does not require the kind of protection offered by
LCR. Figure 9.3 shows a server that supports four storage groups. You can
see that the default storage group (First Storage Group) contains a public
folder database and has a copy status of “Disabled,” meaning that it does
not use LCR. The storage group at the top of the display also has a copy sta-
tus of “Disabled” although given its name (“Critical Mailboxes”), it is prob-
ably a good candidate to use LCR. The other two storage groups show their
copy status as “Healthy,” so you know that they use LCR. In passing, it is
worth noting that the storage groups and databases on this server do not
follow any naming convention. A server running LCR can become a com-
plex environment, especially with multiple storage groups when some oper-
ate LCR and some do not. It is in these situations that you see the true
value of a consistently applied naming convention.
Figure 9.3
A mixture of LCR
and “normal”
storage groups

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