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MartinBrosch
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Short FT Question for big VM

Hi virtualization colleagues,

i'm on my first fail over techniques considerations. And therefore i need some help...

Initial Position:

4x ESXi Server 6.5U1 std. running in a cluster with VSAN configured and licensed (VSAN FT is 1)

Cluster HA is at the moment disabled

One VM running in that cluster should be protected as good as possible:

VM Data:

4 vCPUs

128GB RAM (could be shrinked to 64GB)

6 virtual Disks:

1x 30GB, 1x 80GB, 1x 7TB on SAN Datastore

2x 10GB, 1x 380GB on VSAN Datastore

At the moment my understanding is that:

  1. If the Host on which the VM is running brakes down i have to attach it to the inventory of another and have to restart it
  2. If another Host brakes down the VM is still running

Now if i activate HA for the cluster the will be restarted automatically in case 1?!

The main question is would it be possible to activate FT for the VM to have the shadow copy running on another Server?

At the moment i see the limitations RAM (till i shrink it to 64GB) and the 2TB virtual Disk maximum. The Disk maximum is a little bit unclear. Because the Huge 7TB Disk is on a SAN an won't be affected when a Server brakes down.

Thank you,

Martin

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a_p_
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Welcome to the Community,

if a host breaks, HA will restart VMs on other hosts, assuming that there are sufficient resources available (Admission Control should take care of this).

Fault Tolerance my not be an option in this case due to the disk >2TB.

What FT does is to maintain copies of all virtual disks (i.e. you need double disk space), except you enable Legacy Fault Tolerance. I can't tell you for how long this will be supported, so I wouldn't recommend to do this anyway.

André

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a_p_
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Welcome to the Community,

if a host breaks, HA will restart VMs on other hosts, assuming that there are sufficient resources available (Admission Control should take care of this).

Fault Tolerance my not be an option in this case due to the disk >2TB.

What FT does is to maintain copies of all virtual disks (i.e. you need double disk space), except you enable Legacy Fault Tolerance. I can't tell you for how long this will be supported, so I wouldn't recommend to do this anyway.

André

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MartinBrosch
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Hi André,

thank you for your help. Good to know.

Have a nice day

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