https://aznot.com/index.php?action=history&feed=atom&title=VMworld_2015%2FBuilding_a_Stretched_Cluster_with_Virtual_SANVMworld 2015/Building a Stretched Cluster with Virtual SAN - Revision history2026-05-09T00:13:22ZRevision history for this page on the wikiMediaWiki 1.41.0https://aznot.com/index.php?title=VMworld_2015/Building_a_Stretched_Cluster_with_Virtual_SAN&diff=2454&oldid=prevKenneth at 18:58, 1 September 20152015-09-01T18:58:43Z<p></p>
<p><b>New page</b></p><div>== Building a Stretched Cluster with Virtual SAN ==<br />
<br />
By Duncan Epping and Rawlinson Rivera (VMware)<br />
<br />
“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.”<br />
<br />
Metro Clusters<br />
<br />
vSphere + Virtual SAN – Stretched Cluster<br />
<br />
Fault Domains – (data, data, witness)<br />
<br />
Virtual SAN cluster is formed across the 3 fault domains (sites or datacenters)<br />
<br />
Requirements:<br />
* Network:<br />
** Virtual SAN storage networking<br />
** Virtual SAN witness networking<br />
** vSphere and virtual machine networking<br />
** 10 Gbps connectivity or greater<br />
** < 5 millisecond latency RTT<br />
** Multicasting<br />
* Storage:<br />
** Virtual machine storage<br />
** Witness appliance storage<br />
* Compute:<br />
** Virtual SAN witness<br />
** vSphere HA<br />
** vSphere DRS<br />
<br />
Witness only stores metadata. Communication to it is minimal.<br />
<br />
<br />
Steps to build a stretch cluster:<br />
* Configure Fault Domains<br />
* Select Witness Host<br />
* ?<br />
* ?<br />
<br />
Virtual Machine Monitoring – the core of the heart beating for HA<br />
* If doing maintenance, disable this<br />
<br />
Reserved failover capacity resources – set to 50% (yes you lose half your resources!)<br />
<br />
Test Test Test - Test all of the various failure scenarios you can have<br />
* Network partition between data sites<br />
* Full site failure<br />
* Witness site failure<br />
<br />
---<br />
<br />
Announcing:<br />
* 2-Node Remote Office Branch Office Solution<br />
<br />
Captain VSAN</div>Kenneth