VMworld 2015/Building a Stretched Cluster with Virtual SAN

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Building a Stretched Cluster with Virtual SAN

By Duncan Epping and Rawlinson Rivera (VMware)

“A stretched cluster is a deployment model in which two or more virtualization host servers are part of the same logical cluster but are located in separate geographical locations.”

Metro Clusters

vSphere + Virtual SAN – Stretched Cluster

Fault Domains – (data, data, witness)

Virtual SAN cluster is formed across the 3 fault domains (sites or datacenters)

Requirements:

  • Network:
    • Virtual SAN storage networking
    • Virtual SAN witness networking
    • vSphere and virtual machine networking
    • 10 Gbps connectivity or greater
    • < 5 millisecond latency RTT
    • Multicasting
  • Storage:
    • Virtual machine storage
    • Witness appliance storage
  • Compute:
    • Virtual SAN witness
    • vSphere HA
    • vSphere DRS

Witness only stores metadata. Communication to it is minimal.


Steps to build a stretch cluster:

  • Configure Fault Domains
  • Select Witness Host
  • ?
  • ?

Virtual Machine Monitoring – the core of the heart beating for HA

  • If doing maintenance, disable this

Reserved failover capacity resources – set to 50% (yes you lose half your resources!)

Test Test Test - Test all of the various failure scenarios you can have

  • Network partition between data sites
  • Full site failure
  • Witness site failure

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Announcing:

  • 2-Node Remote Office Branch Office Solution

Captain VSAN

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