[ClusterLabs] Antw: [EXT] Hypothetical question: transitions slow in one direction

[john tillman]

> "DC" is the thing that crm_mon displays as "Current DC:" ;-)


LOL ... wow, it *IS* a Monday morning.  Thank you.

So I booted my VMs for the experiment and created the cluster as before
and now the problem is gone?  The transition is equally fast in both
directions.  I repeated the experiment again with the DC on the other node
and the issue is gone.

Sorry to have wasted everyone's time.  If email could blush ...

Can you take a guess at why a slow down in one direction might have happened?


>
>
>>>> On 02/14/2022 at 02:19 PM, in message <3EEBF8E6.B43 : 250 : 31555>,
>>>> "john
> tillman" <johnt at panix.com> <johnt at panix.com> wrote:
>>>>> "john tillman" <johnt at panix.com> schrieb am 11.02.2022 um 19:01 in
>> Nachricht
>> <72bdd45d23c0ac29fb3d8751d89b32ee.squirrel at mail.panix.com>:
>>> Hypothetically, if I have a two node cluster on identical VMs without
>>> fencing and I see transitions take longer in one direction than the
>>> other.
>>
>> How long is "longer", and where is your DC?
>
>
> Less than 10 seconds for the short transition and maybe a minute for the
> longer.
>
> "DC" ... ok, it's Monday before my first cup of coffee. I can't figure
> out what DC means. Sorry, but can you spell it out?
>
>
>>
>>> What are some possible reasons?
>>>
>>> For example, "pcs node standby nodeX" or "pcs cluster stop nodeX"
>>> results
>>> in a very fast transition to nodeY. However, given the same commands
>>> but
>>> going from nodeY to nodeX takes much, much longer.
>>>
>>> And note that powering off either VM does *not* exhibit this behavior
>>> and
>>> transitions times in both direction are the same, fast.
>>>
>>> Best regards,
>>> ‑John
>>>
>>>
>>>
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