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Disconnect a host from VSAN cluster doesn’t change capacity?

Duncan Epping · Jun 13, 2014 ·

Someone asked this question on VMTN this week and I received a similar question this week from another user… If you disconnect a host from a VSAN cluster it doesn’t change the total amount of available capacity. The customer was wondering why this was. Well the answer is simple: You are not disconnecting the host from your VSAN cluster, but you are rather disconnecting it from vCenter Server instead! (In contrary to HA and DRS by the way) In other words: your VSAN host is still providing storage to the VSAN datastore when it is disconnected.

If you want a host to leave a VSAN cluster you have two options in my opinion:

  • Place it in maintenance mode with full data migration and remove it from the cluster
  • Run the following command from the ESXi command line:
    esxcli vsan cluster leave

Please keep that in mind when you do maintenance… Do not use “disconnect” but actually remove the host from the cluster if you do not want it to participate in VSAN any longer.

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Software Defined, Storage, vSAN 5.5, u1, virtual san, VMware, vsan, vSphere

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Comments

  1. Hans De Leenheer says

    13 June, 2014 at 16:09

    It would be good to know what the implications would be if you did. Is the node still participating in the VSAN cluster? What if you reconnect within a specific time?

  2. Steve says

    16 June, 2014 at 00:12

    Thanks for this info, I thought VSAN required 3 hosts? Your example above only shows 2?

    • duncan@yellow-bricks says

      16 June, 2014 at 08:34

      Yes it does, this was just a quick screenshot from my other lab, will try to replace it when I have some more time and access to my VSAN environment again 🙂

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About the author

Duncan Epping is a Chief Technologist in the Office of CTO of the HCI BU at VMware. He is a VCDX (# 007) and the author of multiple books including "vSAN Deep Dive" and the “vSphere Clustering Technical Deep Dive” series.

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