In the Microsoft Hosted Exchange Server 2007 SP1 implemented the newest characteristics of benefit to administrators and architects messaging. Earlier, Microsoft experts presented terminological distinction between produced service packs and functional packs. As you might expect the update packages correct the errors of previous versions and append some new features to the functionality of the program. From this point of view, Exchange 2007 SP1 is both a functional pack, and service pack. Now we'll observe novelties that will be useful for you and your organization thankfully to SP1. Also, some adjunct information about exchange hosting may be found on the internet.
The main new feature of SP1 is a permanent backing replication Standby Continuous Replication (SCR). LCR and CCR (local continuous replication and cluster continuous replication) are also introduced by the developers together with Microsoft Exchange 2007. The main purpose of LCR is to make transferring of database to other local drives on the similar exchange server 2007. There is a recurrence function and the log LCR that will help you get back failed database or hard disk with database. However, replication LCR has limitations because it repeats just in the same Exchange server. CCR transfers information between 2 nodes in the cluster that distinguishes it from the LCR scheme of work. The major point of the technology is the dependence on scenarios of high reliability and data processing failures that demands the use of exchange clusters.
The SCR method is somewhere between LCR and CCR. LCR is more turned to duplicating the data but not to their maintenance and high fault tolerance. Utilizing the SCR a consumer can duplicate registration database info to another exchange server hosting, which is located in your organization in the similar domain Active Directory (AD), although not certainly on the similar site AD. Thus, SCR allows duplicate database mailbox at the physically distant from the genuine Exchange server implements.
LCR and CCR have some limitations in facility and cluster storage comparing with SCR that does not provide such limitations and is more adaptable according to it. In case you lose your data with SCR it's possible to copy it from another server location and renew it from the other mailbox assisting the influenced consumers. It's also possible to use SCR along with LCR and CCR. On the server source may be enabled LCR and SCR systems in a remote location. And that server can be a member of the cluster together with CCR or without it.