vMotion and Sites and Clusters

Posted on 2014-08-16
Last Modified: 2014-08-17
I understand thing correctly a cluster is a logical boundary for vMotion of any type but my question is can you vmotion between different sites or datacenter's . If so is this what they consider a stretched cluster?
Question by:compdigit44
    LVL 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    Yes, you can, and read Andy's "noddy" understanding.....

    I like to think of a "stretched cluster" as a piece of elastic attached to one of your ESXi hosts, and you pull that ESXi host from Site A to Site B. (and when you pull it, to Site B, all the links attached to ESXi Host 2, are also stretched to Site B). Not uncommon for Site B, to have completely different networking, so there would have to be IP Address changes, and routing between Site A and Site B etc

    So you end up with

    ESXi Host 1 - Site A
    ESXi Host 2 - Site B

    Site B is still managed by the same vCenter Server, and it's managing two Sites (Site 1 and Site 2, and two Datacenters).

    This makes vMotion and Storage vMotion possible, providing that the networking requirements are correct, same network (VLAN) (you've stretched you LAN or VLAN there as well), and storage can be accessed from both Site 1 and Site 2.

    Networking, must be layer 2, and less than 5ms latency, and is generally, less than 100kn away, but it depends on how good your LAN/WAN link between the sites.
    LVL 19

    Author Comment

    Thanks can you send me a link to Andy's article you referenced. Also how does vMotion work between sites with different IP scheme's
    LVL 116

    Accepted Solution

    Andy's noddy understanding is the paragraph that follows.....

    e.g. my understanding, and thoughts in my head, when I describe it to clients!

    I've not article (yet!)

    As long as Hosts are contactable on a network, e.g. a VMKernel Interface flagged as vMotion can contact another host, and communication is possible, a vMotion can occur. (e.g. vMotion occurs via TCP/IP which is routeable!)

    you can read this article, which is more in depth about vMotion across boundaries...
    LVL 19

    Author Comment

    Awesome feedback as always!!! I found the link you referenced very interesting..

    It's true, when it comes down to it, it's all connected via TCP/IP
    LVL 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    Thanks for your kind words.

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