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From: rbowman <bowman@montana.com>
Newsgroups: comp.os.linux.misc,comp.os.linux.advocacy
Subject: Re: GIMP 3.0.0-RC1
Date: 10 Feb 2025 19:27:47 GMT
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On Mon, 10 Feb 2025 12:08:00 +0100, D wrote:

> It turned out that Azure had done something weird when emulating NIC:s
> inside their VM:s, which broke the clustering of the SAP environment
> when moved from on prem to the cloud.

Back before multicore processors I would have to remind people that no 
matter how sophisticated the OS was you had one CPU executing one 
instruction at a time. Then came VMs, with the stress on 'virtual'. When 
you get down to bare metal if you have one NIC there's a whole lot of 
juggling going on.

Back in the day we had a fairly sophisticated technique to mirror the live 
system on a physically remote backup system. As bare metal systems were 
replaced by VMs I had a hard time persuading our support people that their 
time honored setup wasn't too useful when the live system and backup 
system were VMs running on the same hardware. It's conceivable a VM could 
crash and the switchover would work but if a rat chews through the power 
cable they're all going down.

We also ran into problems with the specs on a HA system. Short story, if 
you want to mirror you'd better have a big pipe.

Like most of life a high level abstraction is fine but you need to step 
back every now and then and look at physical reality since there ain't no 
other reality.