Comment 1 for bug 1921616
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| David Jericho (davidjericho) wrote Re: [Feature Request] Tunable IPMI wait_time on power change | #1 |
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bbfa235
(Get the code!)
I'm presently using a work around that modifys the hard coded wait_time values in the ipmi power driver, however this isn't desirable for all the obvious reasons.
The vendor has said there's no way they can assure a time to power on status, and it may vary from chassis to chassis. As systems (particularly AMD) get more packed, it'll take longer. While the IPMI spec itself suggests it's a power-is-applied style status, Dell have interpreted it differently.
It only became an issue with later iDrac firmwares, as there appears to have been a change in the time-to-respond behaviour between 4.30 and 4.32. 4.30 used to take 10 to 15 seconds to respond to the first status query, where as 4.32 responds much much faster, hence triggering the retry loop. As to why the two subsequent "--on-if-off --cycle" causes the system itself to power off, it is a mystery, we can only assume some kind of protection feature against flapping.