[ClusterLabs] Antw: Re: Antw: Re: Antw: [EXT] Stonith failing

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Tue Aug 18 03:35:28 EDT 2020

>>> Andrei Borzenkov <arvidjaar at gmail.com> schrieb am 18.08.2020 um 09:24 in
Nachricht <83aba38d-c9ea-1dff-e53b-14a9e0623d9d at gmail.com>:
> 18.08.2020 10:10, Ulrich Windl пишет:
>>>>> Ken Gaillot <kgaillot at redhat.com> schrieb am 17.08.2020 um 17:19 in
>> Nachricht
>> <73d6ecf113098a3154a2e7db2e2a59557272024a.camel at redhat.com>:
>>> On Fri, 2020‑08‑14 at 15:09 +0200, Gabriele Bulfon wrote:
>>>> Thanks to all your suggestions, I now have the systems with stonith
>>>> configured on ipmi.
>>> A word of caution: if the IPMI is on‑board ‑‑ i.e. it shares the same
>>> power supply as the computer ‑‑ power becomes a single point of
>>> failure. If the node loses power, the other node can't fence because
>>> the IPMI is also down, and the cluster can't recover.
>> This may not always be true: We had servers with three(!) power supplies
> a
>> BMC (what today is called "light-out management"). You could "power down" 
> the
>> server, while the BMC was still operational (and thus could "power up" the
>> server again).
>> With standard PC architecture these days things seem to be a bit more
>> compicated (meaning "primitive")...
> BMC is powered by standby voltage. If AC input to all of your power
> supplies is cut off, there is no standby voltage anymore. Just try to
> unplug all power cables and see if BMC is still accessible.

Of course! What I tried to point out is: With a proper BMC, you DON'T need to
cut off the server power.


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