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

[Ulrich Windl]

>>> "john tillman" <johnt at panix.com> schrieb am 14.02.2022 um 15:54 in
Nachricht
<7db29102efdf0c227c42bb77c1c95829.squirrel at mail.panix.com>:
>>  "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.

My initial suspect was that when the DC goes stanbdby the election for a new
DC could take extra time...

> 
> 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,
>>>> â€â€̃John
>>>>
>>>>
>>>>
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