[PVE-User] Confused about fencing device...
dietmar at proxmox.com
Sat Sep 21 16:00:05 CEST 2013
> Well.... That's a different approach... But still we will need an APC or whatever to make fence...
> Why this is so mandatory? With XenServer this kind of hardware is not necessary...
Well, that is what they claim - in reality, a working fencing infrastructure is mandatory for reliable HA.
Else, you always have the risk that a VM runs on 2 nodes at the same time. Also, a single, centralized
storage is a single point of failure (SPOF), so I would not talk about HA in above scenario.
Anyways, there are different solution - so feel free to choose what you like most ;-)
But you are probably wrong if you think all you need are 2 nodes and one cheap
central storage. A minimum requirement is
- redundant networking
- redundant switch infrastructure
- redundant power supplies
- redundant storage
- UPS for all devices
So the need for the additional fencing infrastructure is quite negligible here (cheap add-on to UPS devices).
HA is nothing you get for free ;-)
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