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stretched cluster VM redundancy

 
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temuri426
Frequent Advisor

stretched cluster VM redundancy

in case of stretched cluster can i have primary and secondary copies only in
Main site, not in DR side?

if the node with primary copy fails , secondary copy on the same site will become primary, at this moment can i trigger creation of new secondary copy to one of the DR nodes?


point is that customer does not need to run VM in DR when primary fails.

10 REPLIES 10
LiamP
Advisor

Re: stretched cluster VM redundancy

A stretched cluster means a cluster may be located in different physical locations and uses zones to separate.

It does not mean, a Primary and DR site.

So, once zoning is configured, then replicas will be located within each zone.

If a customer had a design of two nodes in one site lets say primary and one node in a DR site i.e. 2 + 1, then both replicas will remain in the primary site. 

 

 

 

 

 

MikeSeden
HPE Pro

Re: stretched cluster VM redundancy

As far as VMware is concernered- 

Stretched clusters extend the vSAN cluster from a single data site to two sites for a higher level of availability and intersite load balancing. Stretched clusters are typically deployed in environments where the distance between data centers is limited, such as metropolitan or campus environments.

You can use stretched clusters to manage planned maintenance and avoid disaster scenarios, because maintenance or loss of one site does not affect the overall operation of the cluster. In a stretched cluster configuration, both data sites are active sites. If either site fails, vSAN uses the storage on the other site. vSphere HA restarts any VM that must be restarted on the remaining active site.

A HPE SimpliVity Stretched Cluster-

HPE OmniStack software guarantees that in a healthy and synchronized environment the unexpected loss of one HPE OmniStack System will not lead to data unavailability. Customers have also requested the ability to describe the most likely failure scenario where an entire group of HPE OmniStack System may be lost simultaneously, and for HPE OmniStack software to ensure that customer data remains available.

The HPE Simplivity Stretched Cluster solution works in cooperation with vSphere HA and vSphere DRS to ensure that when one or more HPE OmniStack System failures occur in a physical location, guest virtual machines can be restarted in a second location. This provides for business continuity with failover time measured in seconds.

So to speak to: "point is that customer does not need to run VM in DR when primary fails." DR is usually implemented when the possibility of a site failure might happen.  If the Primary site has the Primary and Secondary node and only one node goes down, DR would not be triggered because the other node would do as it is designed and trigger a new VM. Both primary and secondary copies are at the Primary site as described in Liam's 2+1 comment. If the SITE fails then DR would be triggered and copies of VMs would start to come up at the DR site.

So do you need to run DR with SimpliVity? Only if there uis a chance of Site Failure.


Mike Seden CCNA: R/S & Security, VCP6-DCV, CISS
Software Defined and Cloud Support
SimpliVity and Synergy Support
Call Center 866-211-5211, Option 4, Option 1


While I work for HPE, any personal opinions expressed are mine, and not official statements on behalf of HPE.
temuri426
Frequent Advisor

Re: stretched cluster VM redundancy

Hi,

yes you are right, customer needs stretched cluster but they to run DR with SimpliVity Only if there is a chance of Site Failure.

is this possible? if yes can please give me bit more technical details, or any documentation which describes the VM copy process with stretched clusters

MikeSeden
HPE Pro

Re: stretched cluster VM redundancy

How many nodes in the cluster?

Look Here- http://www.vhersey.com/2018/02/19/hpe-simplivity-federation-design/


Mike Seden CCNA: R/S & Security, VCP6-DCV, CISS
Software Defined and Cloud Support
SimpliVity and Synergy Support
Call Center 866-211-5211, Option 4, Option 1


While I work for HPE, any personal opinions expressed are mine, and not official statements on behalf of HPE.
temuri426
Frequent Advisor

Re: stretched cluster VM redundancy

we will have four nodes in main site and four nodes in DR.