will manual DRS vmotion on ESX host failure

Hi - I like it on manual as it recommends where to put the vm

However if a host fails - what is the effect of this? - would the VMs move? - would I need to
follow a prompt to move - so if it was middle of night they  (VMS) would not be available?
esx 5.1
Thanks
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philb19Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
"One add point is that services like DRS and HA use vMotion...."


and one correction....

VMware HA does not use VMotion. DRS is the only function which uses vMotion, other than a manual migration (vMotion)

vMotion is the Live Migration of VMs.

Under a VMware HA scenario, the VM is not live, it's failed and stopped! (crashed!).

VMware HA, restarts the VM on another host.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
However if a host fails - what is the effect of this? - would the VMs move? - would I need to
follow a prompt to move - so if it was middle of night they  (VMS) would not be available?
esx 5.1

No, they would not move. If you do not have VMware HA configured, the VMs would be unavailable, and off, because the hosting server has failed. DRS only moves VMs using vMotion based on selection and loading on the Hosts.

VMware DRS is not responsible for moving VMs on host failure.

VMware HA if correctly configured, will restart VMs on another host should the hosting host fail.

VMware Distributed Resource Scheduler (DRS) Product Briefs

http://www.vmware.com/files/pdf/VMware-Distributed-Resource-Scheduler-DRS-DS-EN.pdf
http://www.vmware.com/pdf/vmware_drs_wp.pdf

VMware High Availability (HA) Product Briefs

http://www.vmware.com/pdf/ha_datasheet.pdf
http://www.vmware.com/files/pdf/VMware-High-Availability-DS-EN.pdf
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Aravind SivaramanTechnical Subject Matter ExpertCommented:
DRS - it load balance the VM's when there is resource crunch in the cluster.

You would need to enable VMware HA for the VM's to failover when there is host failure in the cluster.
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compdigit44Commented:
One add point is that services like DRS and HA use vMotion to move VM other host if need be. HA and DRS by these self can move VM's. As you can see most of the features in vCenter/ESXi are tightly integrated.
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compdigit44Commented:
Thanks for the tip Hancock!!! ;-)
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
@comp no problems!
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philb19Author Commented:
Thanks to all who posted
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