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Each managed host must use a storage area network (SAN). A SAN is a device with access to a server that makes the device appear as locally attached to the server's operating system. Each managed host must also use shared virtual machine file system (VMFS) volumes. The VMFS is used to store disk images and snapshots of virtual machines.
A Gigabit Ethernet (GbE) network is also required between hosts. A GbE network is able to transmit Ethernet frames at a rate of a gigabit per second. VMotion also requires a private GbE migration network between all hosts. When the GbE network is utilized on VMotion, the managed host can configure a unique network identity object that can be connected to the private migration network.
A compatible set of processors is also a requirement. For VMotion to maintain functionality the processors of the target host have to be able to resume execution using equivalent instructions in the event that processors of the source host are suspended. Processors must come from the same vendor and processor family for compatibility with VMotion. Different versions of processors within the same family are usually similar enough to maintain effective configuration with VMotion.
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What are the two prerequisites to enable AutoQoS VoIP?
Cisco Express Forwarding and bandwidth of the interface
What is Metro vMotion?
There's a new component that is part of vMotion which is only enabled with Enterprise Plus and that components is what we call 'Metro vMotion'. This feature enables you to safely vMotion a virtual machine across a link of up to 10 miliseconds RTT. In the case of vMotion the standard socket buffer size is around 0.5MB. Assuming a 1GbE network (or 125MBps) then bandwidth delay product dictates that we could support roughly 5ms RTT delay without a noticeable bandwidth impact. With the "Metro vMotion" feature, we'll dynamically resize the socket buffers based on the observed RTT over the vMotion network. So, if you have 10ms delay, the socket buffers will be resized to 1.25MB, allowing full 125MBps throughput. Without "Metro vMotion", over the same 10ms link, you would get around 50MBps throughput In vSphere 4.1, vMotion is supported only when the latency between the source and destination ESXi/ESX hosts is less than 5 ms RTT (round-trip time).For higher latencies, not all workloads are guaranteed to converge In vSphere 4.1, vMotion is supported only when the latency between the source and destination ESXi/ESX hosts is less than 5 ms RTT (round-trip time).For higher latencies, not all workloads are guaranteed to converge. With Metro vMotion in vSphere 5.0, vMotion can be used to move a running virtual machine when the source and destination ESX hosts have a latency of more than 5ms RTT. The maximum supported round trip time latency between the two hosts is now 10ms. Metro vMotion is only available with vSphere Enterprise Plus license
What would one use a vmotion for?
VMotion, a product of VMware, is a piece of server software. It can transfer a running virtual machine from one host to another. It runs on the server hardware, meaning virtual servers can use the hardware directly.
What is vmotion in vmware terminology?
Move running virtual machines from one physical server to another with no impact to end users. VMware vMotion keeps your IT environment up and running, giving you unprecedented flexibility and availability to meet the increasing demands of your business and end users
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