Comment by tsimionescu

1 year ago

I'm not sure that's true. Shutting down unneeded hardware seems like a very simple but major optimization.

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tsimionescu

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littlestymaar  1 year ago

You assume that the hardware would be unneeded, but that's a very strong assumption.

It would be very bad for any cloud provider to leave hosts with only one VM running on it, and you can be pretty sure only very small minority of their park that end up in that situation where shutting down a single VM would lead to a shut-down of the entire host, because it means that the host was vastly under-used in the first place.

  • tsimionescu  1 year ago

    As far as I know, most cloud hosts don't actually support automatically moving live VMs, so I think it's fairly common for a host to be left running a single VM.

    At least in AWS, they never supported this, and in fact may require you to reboot an instance occasionally in order for it to be moved to a new hardware host (typically when they are upgrading their hardware).

    • littlestymaar  1 year ago

      But why are you talking about moving VMs?! Looks like you're adding tons of far-fetched speculations at every step of your reasoning.

      The way you easily deal with this issue is very simple and does not require moving VMs: you just allocate newly spawned VMs to existing hosts with available room! When you do so (and they obviously all do!) you end up with little unused hardware…

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