On 9 Sep 2014, at 4:11 pm, Ulrich Windl <ulrich.wi...@rz.uni-regensburg.de> wrote:
>>>> Andrew Beekhof <and...@beekhof.net> schrieb am 09.09.2014 um 00:25 in >>>> Nachricht > <c19365b9-b626-471e-a92a-001950d01...@beekhof.net>: > >> On 8 Sep 2014, at 5:19 pm, Ulrich Windl <ulrich.wi...@rz.uni-regensburg.de> >> wrote: >> >>> Hi! >>> >>> I remember having asked this before, but I'l still missing a good >> explanation: >>> >>> What are the precise semantics of "dampening" (attrd_updater -d)? >>> >>> The manual page just says: >>> -d, --delay=value >>> The time to wait (dampening) in seconds further changes occur >>> >>> Who is waiting? >> >> attrd before it updates the cib > > So the RA sees an extra delay of -d seconds? No. attrd does the waiting, not attrd_updater > >> >>> What changes? >> >> other processes or nodes calling attrd_updater > > So it means that if you call "attr_updater -d X" and then "attr_updater -d Y" > the second update will be delayed until at least X seconds since the first > update passed? No. It means wait X seconds for another update (locally or on another node) before writing the value to the CIB. If another update does arrive, reset the clock and wait another X seconds. Repeat. Usually only the -d from the first call to attrd_updater has any affect. Subsequent calls re-use the -d value from the first. > If a third "attr_updater -d Z" is called, will the system ensure that at > least X + Y seconds passed since the first update before appying the third > update? No. > > If the delay is not over, does the next update wait (as I guessed), or is the > next update simply ignored? > >> >>> Please explain! > > As you see, there are too many questions that are still unanswered. > >>> (pacemaker-1.1.10-0.15.25 of SLES11 SP3) >>> >>> Regards, >>> Ulrich > > > _______________________________________________ > Linux-HA mailing list > Linux-HA@lists.linux-ha.org > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems
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