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HA high availability of Virtual machines in case of any Host is down
HA is the technique of migrating a VM when a ESX host is down, the process of migrating a VM is vmotion.
Vmotion is used to migrate to VM in one host to another without downtime its a virtual motion of VM
HA is high available is the movement to the high available VM
vMotion allow to move VMs one server to other servers with zero down town
HA provides high availability to VMs , HA restart VM in case of failure .
The vmotion is a feature that let administrator to manually migrate vm from host to another for maintainace or any other reason or can be automatically migrated using DRS feature , in both situations there is zero down-time at moment of migration.
the DRS auto migration occurs based on periodic collected statistics to redistribute the running vm's across hosts with
resources optimization , in the case of one or more host crashes inside the RDS cluster , all vm's on those hosts will shutdown.
So what is the solution???
the solution is the high availability (HA), when it is enabled , an HA agent will installed on each host.
if we have3 hosts, the available resorces should be fair enough in case of one of hosts crashes , the vm's on that host will shutdown then will restart on the other hosts. also please note that HA depends on vmotion
VMotion used to moved machine from one host to another host.
HA restart your machine from other host in case of any failure (hardware, network etc)
vMotion is live migration of a VM from one host to another without service interruption. ( No downtime in vMotion only single ping response will be lose)
HA will restart a VM from one host to other hosts available in the HA cluster, Ex: suppose a host not working or issues related to hardware, Network Etc... ( Downtime until VM is restarted to available host)
vMotion allows you to live migration a VM on one host to another without downtime.
HA provides high availability to VMs based on vMotion, HA restart VM in case of failure happened.
