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In addition to Cisco Unified Communications (UC) applications sold with Cisco Business Edition 6000 (BE6000) and Cisco Business Edition 7000 (BE7000), Cisco also allows the installation of a broader range of Cisco and third-party virtualized applications, subject to the conditions that are detailed in this document. This change of policy applies to all new and previously supplied BE6000 and BE7000 servers using embedded Cisco hypervisor licenses.
- Business Edition applications means the Collaboration applications that are explicitly included in the BE6000 and BE7000 Solutions. These applications are preloaded on the server and are usually integrated with BE6000 licensing:
– Virtualized third-party applications that are included in the Cisco Developer Network, Marketplace Solutions Catalog for Collaboration. A list of all permitted third-party Collaboration applications can be found here . (Select Technology =Collaboration .)
( Note : Third-party applications that are not part of CDN may not be used with the Business Edition embedded hypervisor licenses).
– Virtualized third-party applications that are offered through the Cisco SolutionsPlus Program and complementary to Collaboration are described at the following URL:
- Coresident means “running different Collaboration applications in dedicated virtual machines on the same virtualized Business Edition host.”
For the above supported third-party applications, there is a maximum number of virtual machines allowed in a BE6000 or BE7000 deployment using Cisco Unified Communications Virtualization Hypervisor or Cisco Unified Communications Virtualization Foundation licensing.
In a BE6000 or BE7000 deployment with one physical server, up to three third-party applications may run on the server. Where two physical servers are present in a deployment, a maximum of six third-party application virtual machines may be installed across the two servers. For larger deployments, a maximum of three times the number of physical servers is permitted. The allowed quantity of third-party virtual machines can be deployed across physical servers in any combination. For example, with two physical servers, the six virtual machines can be distributed evenly across both, all, or one physical server.
The co-residency policy that is defined in this document applies to deployments on any BE6000 or BE7000 server running Cisco Unified Communications Virtualization Hypervisor version 5.x or Cisco Unified Communications Foundation version 5.x.
Customers that run a coresident deployment that includes non-Business Edition applications must agree to temporarily reduce the number of virtual machines that are running on a host if Cisco deems it necessary for debugging purposes.
To ensure there is no over subscription of memory, you must set up all coresident virtual machines with a physical memory reservation equivalent to the vRAM setting. For example, if a virtual machine is configured with 4GB of vRAM, you must assign a physical memory reservation of 4GB.
To virtualize a BE6000 or BE7000 server, the hypervisor requires physical memory to host and run the virtual machines. To ensure that virtual machines have sufficient resources, this memory overhead must be taken into account to avoid resource oversubscription. ESXi 5.0 and 5.1 hosts must reserve 2 GB RAM for this overhead. ESXi 5.5 hosts must reserve 4 GB RAM.When you plan a coresident deployment, you must account for this overhead. For example, if the BE6000 host has 32GB of physical RAM, only 30GB of this is available to virtual machines. For more information, see “Understanding Memory Overhead” at the following URL:
A BE6000 deployment must have a one-to-one allocation of vCPUs to physical cores. For example, if you have a host with 16 physical cores, you can deploy any combination of virtual machines with a combined requirement of no more than 16 vCPUs. There is a special case if one or more of the virtual machines are running Cisco Unity Connection. In this case, you can deploy any combination of virtual machines with a combined requirement of no more than 15 vCPUs.
The Direct Attached Storage (DAS) must supply the combined disk space and IOPS (Input Output Operations per Second) capacity for the virtual machines that will run on the host, while maintaining a minimum performance level.
It is unlikely that the latency requirements of the Business Edition applications will limit third-party applications. However, you must understand the latency and load requirements of the non-Business Edition applications before installation.
The DAS and RAID are configured during manufacturing, and no field changes are allowed to the BE6000 or BE7000Unified Computing System Tested Reference Configuration (TRC). The BE6000 TRC is designed to meet the storage requirements of all BE6000 collaboration applications. The BE7000 TRC is designed to meet the storage requirements of higher capacity points of these applications as described at the following URL:
Cisco recommends that deployments that include non-Business Edition applications be verified such that the kernel command latency does not exceed 3 ms and the physical device command latency does not exceed 20 ms under any conditions. For more details, see “Sizing Shared Storage” at the following URL:
For example, when you test a TRC with DAS, all UC applications that are designed to run on the TRC are loaded with full traffic and software upgrades are run simultaneously on all virtual machines. This generates the highest IOPS load possible on the host, and if this test passes, it is very likely the DAS array can handle the I/O load of the specific set of virtual machines.
To summarize the requirements, the disk subsystem must supply the disk space that is required for all the applications and support the aggregate IOPS load that the virtual machines generate, while not impacting the latency requirements of the UC applications. Otherwise, some virtual machines must be removed.
The aggregate networking load of the coresident virtual machines must not exceed the capacity of the physical networking interfaces. Generally, the I/O capacity of the physical network resources on any modern server is more than adequate to meet the needs of the virtual machines that are being hosted. For UC applications, see the “QOS Design Considerations” at the following URL:
You must understand the networking requirements of the virtual machines that are deployed on the host and how to set up the host networking hardware to meet those needs. If Cisco determines that application performance problems are due to networking congestion within the host, then some VMs must be moved off the host.
Under certain conditions, Cisco allows coresident deployments with a mix of Business Edition and non-Business Edition applications. The requirements that are listed in this document provide the basis for a successful coresident deployment, but due to the unpredictable behavior of non-Business Edition applications and the impracticality of testing every possible combination of applications that could be deployed, Cisco cannot guarantee that following these guidelines alone will be sufficient.
A key principal of virtualization is based on sharing hardware resources among multiple virtual machines. When deploying only Business Edition applications on a host server, Cisco can guarantee levels of performance, because the applications are thoroughly tested and their behavior understood. Deploying coresident third-party applications introduces a degree of unpredictability that can be mitigated by following general principals of virtualization and the specific requirements in this document.
Ultimately, Cisco cannot guarantee that by following these guidelines alone, the virtual machines on a host will never be starved of resources. However, if this does occur, the only recourse will be to remove some of the virtual machines from the host such that the load is reduced. This can be done by moving some of the virtual machines to another host, or by moving all the virtual machines to a more powerful host.