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

[Ulrich Windl]

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


>>> 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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