[ClusterLabs] Antw: how important would you consider to have two independent fencing device for each node ?

[Ulrich Windl]

>>> "Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de> schrieb am 18.04.2017
um
17:07 in Nachricht
<1277815831.15615646.1492528035457.JavaMail.zimbra at helmholtz-muenchen.de>:
> Hi,
> 
> i'm currently establishing a two node cluster. Each node is a HP server with

> an ILO card.
> I can fence both of them, it's working fine.
> But what is if the ILO does not work correctly ? Then fencing is not 
> possible.
> 
> I also have a switched PDU from APC. Each server has two power supplies. 
> Currently one is connected to the normal power equipment, the other to the 
> UPS.
> As a sort of redundancy, if the UPS does not work properly.
> 
> When i'd like to use the switched PDU as a fencing device i will loose the 
> redundancy of two independent power sources, because then i have to connect

> both power supplies together to the UPS.
> I wouldn't like to do that.

Why don't you add a second layer if switched PDUs?

Despite of that I thing server hardware doesn't like power cycles too much.

> 
> How important would you consider to have two independent fencing device for

> each node ? I'd can't by another PDU, currently we are very poor.

So far fencing via SBD and iLO had worked all the time for us. More reliable
that all the rest of the cluster stuff.


> 
> Is there another way to create a second fencing device, independent from the

> ILO card ?
> 
> Thanks.
> 
> 
> Bernd
> 
> 
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> Bernd Lentes 
> 
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