Context: We rent unmanaged server hardware. The hoster's web dashboard offers a "automatic hardware reset" command (next to a "send ctrl-alt-del" command), but it fails to reboot the machine when the Linux kernel has panicked. The hoster's support insists that their "hardware reset" feature is "wired just like a Desktop PC's reset button" as opposed to a Desktop PC's power switch.
They also claim, that reset switches sometimes don't work in case of a frozen system. Is that correct?
I know that a mainboard's ATX power switch is only triggering a ACPI event that needs to be handled by the operating system. If that is frozen, nothing happens. But according to my (outdated?) memories, a mainboard's reset switch does not rely on the OS in any way, and restarts the computer, regardless on the state of the OS.
I have a feeling that this might be less a technical question, but a question about naming conventions. Maybe when the hoster says "like a PC's reset switch" they don't actually mean "wired to the mainboard's reset pins"?
Edit 1: i am talking about standard Intel x64 commodity hardware.
Edit 2: Maybe it's clearer if i split my issue up into three separate, smaller questions:
- What exactly happens when i short-cut the reset pins on a motherboard? ("It behaves as if power was cut" does not qualify as answer)
- Is it possible that short-cutting the reset pins on a motherboard does not lead to a reboot, e.g. in case of a completely frozen OS?
- What else could the my hoster mean with "... behaves exactly like the reset button of a Desktop PC", if not the reset pins on the motherboard?
PS: The hoster is Hetzner.de, their "Dedicated Root Server" line.