Microsoft_Press_ebook_Introducing_Windows_Server_2012_R2_PDF.pdf

Note however that when you connect to a windows

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Note, however, that when you connect to a Windows Server 2012 R2 host from a host running Windows Server 2012 (or a management workstation running Windows 8 with RSAT installed) you will only be able to perform those actions that are supported by Hyper-V in Windows Server 2012. Hyper-V Replica enhancements In the short time that Windows Server 2012 has been released, Hyper-V Replica has proven to be one of its most popular features. Hyper-V Replica provides asynchronous replication of virtual machines between two Hyper-V hosts. It’s easy to configure and doesn’t need either shared storage or any particular storage hardware. Any server workload that you can virtualize on Hyper-V can be replicated using this capability, and replication is encrypted during transmission and works over any IP-based network. You can use Hyper-V Replica with standalone Hyper-V hosts, failover clusters of hosts, or a mixture of these environments. The host machines can either be physically co-located or widely separated geographically. And they don’t need to be in the same domain or even domain-joined at all. Hyper-V Replica is an ideal technology for organizations that want to add support for disaster recovery to their Hyper-V environment to ensure business continuity. For example, you could use it to provide disaster recovery support for the branch offices by replicating
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22 CHAPTER 2 Hyper-V their virtual machines to hosts at the head office. Another possible scenario would be to have a hosting provider set up a Replica server at their data center to receive replication data from a number of Hyper-V hosts running virtualized workloads on the premises of customers. In Hyper-V Replica in Windows Server 2012 R2, greater control over the frequency at which data is replicated between hosts is a new feature. In Windows Server 2012, the replication frequency was fixed at every five minutes. Some customers provided feedback that this was not frequent enough for their environment, while others requested the option of performing replication less frequently. So now, as Figure 2-7 shows, there are two new replication frequencies you can choose from besides the default one of five minutes when you enable replication for a server: 30 seconds Choosing this option means that the host in the replica site will never be more than a minute behind the host in the primary site. This option was provided in Windows Server 2012 R2 so that Hyper-V Replica could be used as an alternative to more expensive SAN solutions that have a similar low latency. Organizations that simply need to replicate data as quickly as possible, for example between two data centers in the same metropolitan area, might choose this option. 15 minutes This option was provided especially for organizations that wanted to replicate data over networks that had very high latency or low reliability, for example over a satellite link. To ensure that replication would tolerate network outages and
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