Specifications

31 Reference Architecture | Dell
TM
Unified Communication Solution with Microsoft® Lync® Server 2013 for Single Site
Implementation | Version 1.0
Table 4 has the details about the recommended configuration for the virtual machines that make up this
solution. Based on the role performed by each virtual machine, optimum amounts of compute, memory,
network and storage resources have been allocated. CPU resources are allocated to ensure that the
core:vCPU ratio is not oversubscribed for delay-sensitive real-time traffic. Memory is allocated statically to
each VM, ensuring that resources are guaranteed during peak usage hours.
For service availability in the event of failure at the application level, more than one virtual machine has been
provisioned for all critical Lync server roles. Since persistent chat is not critical for the continued availability
of this solution, only one virtual machine has been incorporated in this solution. The same logic holds true
for the back-end SQL Server for the Archiving+Monitoring and Persistent Chat databases.
Since the Lync Server external website listens on port 4443, instead of on the standard port 443, a Reverse
Proxy is necessary for port translation between the two. The Reverse Proxy can use Microsoft IIS Application
Request Routing (ARR) 2012 to provide access to non-HTTP/HTTPS content for the Lync user requests
originating from outside of the “external firewall.” The IIS ARR component enables IIS to handle Reverse
Proxy requests, URL rewrites and load balancing. It also enables increased web application scalability and
reliability through rule-based routing, client and host name affinity, load balancing of HTTP server requests,
distributed disk caching and optimized resource utilization for application/web servers, among other
benefits.
In addition, the Microsoft Forefront Threat Management Gateway (TMG) 2010 or Unified Access Gateway
(UAG) 2010, another solution from Microsoft, can perform the role of Reverse Proxy Server as well. These
are comprehensive secure web gateway solutions that help to protect Lync users from web-based threats.
Forefront TMG/UAG also delivers simple, unified perimeter security, with integrated firewall, VPN, intrusion
prevention, malware inspection and URL filtering. Even though TMG is discontinued, Microsoft continues to
support it, and enterprises that are already using ForeFront TMG can still leverage it.
4.2 Hardware Specifications
The physical hardware components of the reference architecture are detailed in the following tables.
Table 5 Server Host Configuration Details
Host1 for Lync Core Server
Hardware Dell PowerEdge R620 rack server with 2.5-inch drive chassis
CPU 2 x Intel® Xeon® processor E5-2660 CPUs with 8 cores per
CPU
RAM
64 GB
Networks Quad-port Broadcom® network adapter (within a network
team)
Storage PERC H710P
4 x 900 GB 10K RPM SAS
Host Operating System Windows Server 2012 Datacenter or Standard Edition with
stacked licenses (Hyper-V role enabled)