Not so sure but links refers to HA in RBD primary storage and they mention VM 
HA that is more related to

https://docs.cloudstack.apache.org/en/latest/adminguide/reliability.html?highlight=HA#ha-enabled-virtual-machines
HA-Enabled Virtual Machines
The user can specify a virtual machine as HA-enabled. By default, all virtual 
router VMs and Elastic Load Balancing VMs are automatically configured as 
HA-enabled. When an HA-enabled VM crashes, CloudStack detects the crash and 
restarts the VM automatically within the same Availability Zone. HA is never 
performed across different Availability Zones. CloudStack has a conservative 
policy towards restarting VMs and ensures that there will never be two 
instances of the same VM running at the same time. The Management Server 
attempts to start the VM on another Host in the same cluster.
HA features work with iSCSI or NFS primary storage. HA with local storage is 
not supported.
Is there any PR related to this?
From: Slavka Peleva <slav...@storpool.com.INVALID>
Date: Friday, 2 December 2022, 2:57 AM
To: users@cloudstack.apache.org <users@cloudstack.apache.org>
Subject: Re: VMs HA not working with Ceph
Hello Pradeep, Ranjit,

As far as I know, you need to have an NFS primary storage and OOBM
configured. There is a PR that provides a solution to have HA for RBD, but
it's not merged yet - https://github.com/apache/cloudstack/pull/5862.

I hope the links below will help you
https://docs.cloudstack.apache.org/en/latest/adminguide/reliability.html#ha-enabled-hosts
https://cwiki.apache.org/confluence/display/CLOUDSTACK/Out-of-band+Management+for+CloudStack
https://www.shapeblue.com/host-ha-for-kvm-hosts-in-cloudstack/#Host-HA_on_KVM_host

Best regards,
Slavka

On Fri, Dec 2, 2022 at 9:02 AM Ranjit Jadhav <ranjeet.jad...@gmail.com>
wrote:

> Hello Guys,
>
> We are also struggling with this HA thing any guidance will be highly
> appreciated.
>
> Regards,
> Ranjit
>
> On Thu, 1 Dec 2022 at 20:50, pspa...@hotmail.com <pspa...@hotmail.com>
> wrote:
>
> > Hi,
> > I have build new infra with Ceph storage everything working well.
> > But VMs HA not working. Can anyone guide me.
> >
> > Regards Pradeep Kumar
>

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