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Purpose of Vmware Stretched Cluster

Posted on 2016-11-06
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Last Modified: 2016-11-11
Some environments use  Vmware Stretched cluster for disaster recovery.
- the only way I see it helpful, is when VM Fault-tolerance is enabled. Because if VMs keep Vmotioning between sites then we might see Latency.
If VM keeps replicating to another VM via Fault-tolerance feature, then if  Site A goes down, that will make sense to have similar VM on siteB with exact data to use.

- if you stretch a cluster, I believe you still need to configure VM-ESX host affinity
 
any EE to elaborate on this ?
 
Thank you
stretch.JPG
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Question by:jskfan
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by:Andrew Hancock (VMware vExpert / EE MVE)
Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 41876194
If either Datacenter A or Datacenter B is destroyed or unavailable, you can immediately be back ONLINE, with 1-2 minutes. (if using FT then no downtime).

(depending on replication times between SAN, e.g, constant replication)

Also simplifies networking, DR, no real requirement for failover and failback software, SRM...

So speed of Recovery and Business Continuity.
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by:jskfan
ID: 41878710
By the way, when 2 VMs are in Fault-tolerance(one replicates to the other), one in Production site and one in DR site. I believe they should have the same name, so that clients will reach the VM in the DR site the same way they used to reach the VM in the production site. I was just wondering when both sites are up and 2 VMs with the same DNS name, would this be an issue ?
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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 41878751
By the way, when 2 VMs are in Fault-tolerance(one replicates to the other), one in Production site and one in DR site. I believe they should have the same name, so that clients will reach the VM in the DR site the same way they used to reach the VM in the production site. I was just wondering when both sites are up and 2 VMs with the same DNS name, would this be an issue ?

Although two VMs exist one is Primary and one is Secondary, the Secondary only becomes active, when the primary fails.

So there will never be an issue with two DNS names and IP Addresses conflicting. it cannot happen.
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by:jskfan
ID: 41884193
Thank you
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