[PVE-User] Three node Hyperconverged PVE+Ceph and failure domains...

Eneko Lacunza elacunza at binovo.es
Wed Mar 10 15:19:22 CET 2021


Hi Storm,

El 10/3/21 a las 14:13, storm escribió:
> Hello Eneko,
>
> maybe I am paranoid, but I already experienced this situation when pgs 
> are unavailable until you fix the node/osd on which the missing pg is 
> on with replica=3 in 7 node cluster, with a failing osd on one up node 
> and two other nodes down.
>
> Also have in mind that the cluster will be really slow when a lot of 
> nodes fail and recovery can take a long time...
>
> So better be prepared.
>
> As admin I never want to be responsible for any dataloss.
>
>
> best regards and better be paranoid (always expect the worst case 
> scenario to happen, as it will)

Yes, but I think you should check you procedures so that you don't have 
two nodes down. If you check ceph-user mailing list, almost nobody is 
using size=4, much less for clusters so small.

But hey, if the budget  and performance overhead is good for you, that's 
your decisión (and I concur that it's more secure!)

Regards!

>
>
> Am 10/03/2021 um 13:35 schrieb Eneko Lacunza via pve-user:
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