18.08.2020 10:35, Ulrich Windl пишет: >>>> Andrei Borzenkov <[email protected]> schrieb am 18.08.2020 um 09:24 in > Nachricht <[email protected]>: >> 18.08.2020 10:10, Ulrich Windl пишет: >>>>>> Ken Gaillot <[email protected]> schrieb am 17.08.2020 um 17:19 in >>> Nachricht >>> <[email protected]>: >>>> 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 > and >> 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. >
You seem to completely misunderstand the problem - if external power is cut off, it is impossible to stonith node via IPMI because BMC is not accessible. _______________________________________________ Manage your subscription: https://lists.clusterlabs.org/mailman/listinfo/users ClusterLabs home: https://www.clusterlabs.org/
