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Status Needs more information
Workspace Turbonomic ARM
Categories Action Automation
Created by Guest
Created on Aug 2, 2022

Automatically enable CPU and Memory hotadd

I would like to see a policy option for enabling hot-add as part of a pre or post action. this would simply adoption and onboarding of Virtual machines.
Idea priority Medium
  • Guest
    Sep 19, 2022

    @Simon Ravenscroft as the below statements have noted this would "significantly lower the barriers for customers to execute Turbo's actions." asking for double outages for turbo actions and also in most cases this would limit the enabling of hot add to VMs that get scale actions reducing downtime for VMs that do not currently need actions.

  • Guest
    Aug 20, 2022

    We had this same challenge in our environment when implementing Turbo's scaling actions. Scaling down to reclaim resources is only palatable to an end-user if they know Turbo will scale the VM back up non-disruptively when resources are needed again. By having hot-add automatically enabled during the action sequence, we would be significantly lowering the barriers for customers to execute Turbo's actions.

    Level of effort is high to enable hot-add on VMs since it requires downtime. I'm now having to ask application owners to take their VM down twice. Once to enable hot-add, and again to have Turbo automatically size the VM.

    So in our environment it was many hours over a few weeks of communicating to end users that we were going to take their VMs down, shutting down those VM, developing a script to enable hot-add on all powered-off VMs, and then powering the VMs back on. ...and guess what happens when someone deploys a new VM on a later date, the whole process needs to start happen again. Would rather avoid that situation completely and just have something take care of enabling hot-add when it's already taking the VM down for scaling.

    This very well could be part of a broader feature to have some out-of-the-box action scripts that performed simple tasks. Enable hot-add, install VMTools, etc (perhaps others might think of more). Should be in the context of "if Turbo could also take care of this really simple task, it would be a no-brainer for me to execute this action."

  • Guest
    Aug 12, 2022

    The level of effort is significant since enabling hot-add requires the VM to be powered off, which would mean a separate outage window to complete this work. The advantage of doing this with Turbo is that Turbo will already shutdown the VM for scaling when hot-add is not enabled and customers can take advantage of the single downtime to enable hot-add on the VM instead of having multiple downtime windows to essentially achieve the same end result. Agreed we should have a popup or hover over explaining the impact of doing this. .In my case with customers, they want to have this enabled so that when scaling down they can have hot-add enabled to give resources as needed over time when additional performance is needed.

  • Admin
    Simon Ravenscroft
    Aug 12, 2022

    Nice idea, thanks Simon!

    We do need to be mindful of the following if doing this:

    • Enabling hot-add negatively impacts some vCenter features (vNUMA; Fault tolerance being two) which would affect performance or availability.

    • The Guest OS needs to support it.

    • The Application needs to support it.

    That said, perhaps an option to enable/disable/preserve hot-add sockets on the vCPU Scaling Controls policy settings would be a good first step. With a quick help or hover help to communicate the above so it's clear to the user what the impact is.

    In terms of value. What is the level of effort required to enable hot-add on VMs ahead of automating the resize up actions?