How does PVE handle Host related failures with HA

Discussion in 'Proxmox VE: Installation and configuration' started by velocity08, Jun 21, 2019.

  1. velocity08

    velocity08 Member

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    Hi Community

    We run a VMware environment and seeing some issues with HA failing to detect a host issue and move VM's to functioning hosts.

    This has prompted my question today about how PVE manages hosts that have partially failed and are not 100% responsive but responsive enough to respond to PING or to ssh into the host.

    What actually triggers an automated migration of VM > new host and HA to start.

    What experiences have others had with this and how have the issues been handled?

    ""Cheers
    G
     
  2. dcsapak

    dcsapak Proxmox Staff Member
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    what exactly does this mean for you? a high load is not really an error condition

    our stack relies on corosync for quorum, as soon as corosync looses connection to a node, and a specified timeout of 60 second occurs, the node fences itself and
    the ha stack can takeover the vms

    better described in our reference documentation https://pve.proxmox.com/wiki/High_Availability
     
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  3. velocity08

    velocity08 Member

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    Hi dcspak

    Thanks for replying.

    I’m not concerned with high load that’s a different issue and not mentioned in my post.

    I’m not 100% sure what VMware vSphere uses for its HA apart from using data stores as a witness.

    The issue we are facing atm with vSphere is why I’m posing this question to learn more about how PVE manages and detects failures.

    Can you please advise how does corosync work with HA in more detail what does it actually do and what methods does it use to monitor a Connection?

    “”Cheers
    G
     
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