Link exchange dating directories

15-Sep-2016 19:29 by 9 Comments

Link exchange dating directories

LCR or Local Continuous Replication has been referred to as the "poor man's cluster".It is designed to allow for data replication to an alternative drive attached to the same system and is intended to provide protection against local storage failures.

The limitation of CCR clusters is the ability to have only two nodes and the third node known as "voter node" or file share witness that prevents "split brain" scenarios, generally hosted as a file share on a Hub Transport Server.There have been a number of versions: Exchange Server Enterprise Edition supports clustering of up to 4 nodes when using Windows 2000 Server, and up to 8 nodes with Windows Server 2003.Exchange Server 2003 also introduced active-active clustering, but for two-node clusters only.Over time, however, it added support for POP3, IMAP, SMTP, and EAS.Exchange Server is licensed both in the forms of on-premises software and software as a service.In the on-premises form, customer purchase client access licenses (CALs).

In the software as a service form, Microsoft receives a monthly service fee instead (see Microsoft Office 365).

Device CALs are assigned to devices (workstation, laptop or PDA), which may be used by one or more users.

User CALs, are assigned to users, allowing them to access Exchange from any device.

This service pack includes an additional high-availability feature called SCR (Standby Continuous Replication).

Unlike CCR, which requires that both servers belong to a Windows cluster typically residing in the same datacenter, SCR can replicate data to a non-clustered server, located in a separate datacenter.

It does not protect against the case where the server itself fails.