Take steps to optimize application performance and catastrophe recovery in a virtual server environment.

In a virtualized environment, IT managers should pay attention to the impact WAN performance has on application performance. When virtual servers are placed in centralized locations, limited bandwidth, high latency and packet loss on the WAN can impact application performance for end users. At the same instance, the WAN can present a major obstacle for notes protection and catastrophe recovery in these environments, when large virtual images must be replicated within geographically disperse locations. For all of these reasons, WAN optimization has become a key enabler for strategic virtualization projects.

There are many reasons why enterprises turn to virtualization as a way of consolidating application servers and databases. While hardware and management costs are typically the most recognized, performance, scalability and safety measure benefits can additionally be primary drivers.

Virtual machines suffer all the same performance challenges as physical servers when accessed

across a WAN. More specifically, the following WAN characteristics can all adversely impact the performance of centrally hosted virtual applications:

Limited bandwidth. Depending on the volume of notes being accessed and transferred across the WAN, bandwidth can be a major concern in a virtualized environment. WAN speeds typically operate at a fraction of LAN speeds, which formulates a natural bottleneck that can adversely impact the performance of many virtual applications.

High latency. instance is essential to physically communicate from one location to another, which can be exacerbated by “chatty” communication protocols, such as the transport control protocol (TCP). The impact latency will have on performance will depend on the type of application being hosted centrally.

Packet loss. As enterprises move increasingly to multi-protocol label switching (MPLS) and Net protocol virtual private networks (IP VPNs), packet loss is becoming a bigger problem. These networks are oversubscribed by the carriers, which can…

Orginal post by Mike

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