We have 8 nodes running vSAN hybrid configuration in our main datacenter. We replicate ~20 critical VMs to our DR site with Veeam once a day. The replication job takes ~5 hours to complete over a 400Mbs connection. The critical VMs consists of DC, Exchange, web, app and database servers. There is a plan to build a new emergency center/server room on-campus. The goal is to have synchronous data replication of those critical VMs to this new site (still keeping the asynchronous replication to DR).
Thank you!
Hi,
Yes, a vSAN stretched cluster should be a good fit but you will need to mirror the amount of hosts and disk groups on the emergency site.
More details here:
VMware® Virtual SAN 6.1 Stretched Cluster & 2 Node Guide
Page 14 - Configuration Minimums and Maximums - Hosts per cluster
This 31 host (15+15+1) max limit for stretched clusters remains in 6.5.
Hello pineapplehead,
Yes, 'Unbalanced' or 'Asymmetric' stretched-clusters are supported (in vSAN 6.6) - but of course this needs to be configured properly and within reason.
This is achieved via what is essentially data locality settings via Storage Policies - PFTT (Primary Failures To Tolerate) and SFTT (Secondary Failures To Tolerate).
Some good resources on this:
yellow-bricks.com/2017/07/30/unbalanced-stretched-vsan-cluster/
blogs.vmware.com/virtualblocks/2017/04/18/pm-hub-better-site-protection-stretched-clusters/
storagehub.vmware.com/#!/vmware-vsan/vsan-stretched-cluster-2-node-guide/configure-stretched-cluster-site-affinity-1
Bob