Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: rbowman Newsgroups: comp.os.linux.misc,comp.os.linux.advocacy Subject: Re: GIMP 3.0.0-RC1 Date: 10 Feb 2025 19:27:47 GMT Lines: 26 Message-ID: References: <655acbf6-05e5-69ff-8a44-9f7075aafa2e@example.net> <90d96981-698c-2175-9055-346f91e9fe8d@example.net> <8Xednfe-7ZccxzT6nZ2dnZfqnPednZ2d@earthlink.com> <614937ad-b812-3130-bd86-49827e750e1e@example.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net +HSBHZNKQc3c3oFFoYFLxAQZ9yALF4L9+gIkZTEATHJm5qC7UY Cancel-Lock: sha1:9XjorLurkTPa0ajy6PxIICZ/7Fo= sha256:073PrxX+qJgKMgA6AbxV486zBgHr+QCJF6fL9X78g1A= User-Agent: Pan/0.160 (Toresk; ) Xref: csiph.com comp.os.linux.misc:65363 comp.os.linux.advocacy:685598 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.