[PVE-User] proxmox serverfarm - how?

Humberto Jose de Sousa humbertos at ifsc.edu.br
Wed Mar 3 12:42:08 CET 2021


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 at 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 schrieb aderumier at 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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