Interesting. I'm thinking there's something else off there. Perhaps the hypervisor is incredibly oversubscribed? On Mon, Feb 17, 2020 at 04:12:59PM -0600, Hunter Fuller wrote:
I wouldn't say we need it to be "really precise," but we do need it within a couple of seconds, and on ESXi 6 we were seeing boxes as far as 500ms off. It may not apply to all VM environments, so I guess it could be worth testing. But it certainly scared me off. With physical NTP servers we achieve within 10ms generally.
On Mon, Feb 17, 2020 at 4:09 PM Alex Balashov <abalashov at evaristesys.com> wrote:
On Mon, Feb 17, 2020 at 04:00:25PM -0600, Hunter Fuller wrote:
On Mon, Feb 17, 2020 at 3:57 PM Mike Hammett <voiceops at ics-il.net> wrote:
Is having four VMs running NTP a ridiculous proposition (well, other than resources, which it'll consume very little)?
Yes. NTP servers should never run in VMs.
I don't know about that. The nature of virtualisation has changed greatly over the past decade; VMs have gone from being a kludgy and slow software-emulated environment to almost a first-class CPU guest, thanks to paravirtualisation and supporting CPU features.
And NTP is specifically designed for latency in a rather general sense.
If you're using NTP for any really precise timing calibration, that's the wrong vehicle, anyway.
-- Alex
-- Alex Balashov | Principal | Evariste Systems LLC
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-- Alex Balashov | Principal | Evariste Systems LLC Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/