Re: [PVE-User] proxmox serverfarm - how?

[Roland <devzero@web.de>]

yes, that's what i would expect to happen and i'd like to avoid.

Am 03.03.21 um 12:42 schrieb Humberto Jose de Sousa via pve-user:
>
> Re: [PVE-User] proxmox serverfarm - how?.eml
>
> Betreff:
> Re: [PVE-User] proxmox serverfarm - how?
> Von:
> Humberto Jose de Sousa <humbertos@ifsc.edu.br>
> Datum:
> 03.03.21, 12:42
>
> An:
> Proxmox VE user list <pve-user@lists.proxmox.com>
>
>
> The worst thing that may happen is a split brain cluster if you set "pvecm
> expected 1"
>
> Em qua., 3 de mar. de 2021 às 08:26, Roland<devzero@web.de>  escreveu:
>
>> the question for me is, what can go wrong this way or in what way
>> clustering conflicts with the idea of running a "temporary server farm"
>> which is shutdown completely for long periods.
>>
>> what happens for example if i set "pvecm expected 1"  and
>> startup/shutdown different individual servers or pairs of servers? i
>> think that won't fit...
>>
>> when setting "pvecm expected 1" , wouldn't we need to know which
>> server(s) of the farm was being used last and shutdown last?
>>
>> so, rethinking about this - doesn't it make sense to have something up
>> and running independently of that farm for maintaining cluster
>> state/node information?
>>
>> what about adding one or two rasberry pi or two virtual maschines "on
>> some other, independent pve systems" as quorum/qdevice , setting "pvecm
>> expected 1 or 2" then and have proper backup for these ? can we
>> use/install virtual instances of proxmox for this ?
>>
>> regards
>> roland
>>
>>
>> Am 03.03.21 um 09:28 schriebaderumier@odiso.com:
>>> Hi, if you have something central, knowning exactly how much nodes are
>>> currently running, and stop/starting them dynamically
>>>
>>> you could play with "pvecm expected X"  to tell how many vote you need
>>> to have quorum.
>>>
>>> (for example, you have 10 nodes builded in corosync,  you shutdown 5 of
>>> them --> so no quorum,   just use "pvecm expected 5")
>>>
>>>
>>> Le mercredi 03 mars 2021 à 08:25 +0100, Roland privat a écrit :
>>>> hello,
>>>>
>>>> we want to build an experimental dynamic „datacenter“ in our
>>>> makerspace (mostly for academic purpose), where the number of nodes
>>>> online depends on energy availability, heat demand, processing
>>>> demand, .... , but if i see this right a proxmox cluster needs half
>>>> of the nodes +1 online to have quorum, i.e. for example we wont be
>>>> able to start a vm if only two out of 10 nodes are online.
>>>>
>>>> what‘s the best way to solve this, i.e. what is the most
>>>> secure/consistent way?
>>>>
>>>> eg for a cluster of 10 nodes, what about adding 10 virtual proxmox
>>>> dummy nodes or qdevice instances in another location (so one single
>>>> physical host online has quorum) instead of tuning node/quorum number
>>>> in corosync configuration?
>>>>
>>>> what we want is a „farm“ but not a cluster. but we want centralized
>>>> management and vm migration.
>>>>
>>>> regards
>>>> roland
>>>>
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