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Re: [Linux-cluster] Choosing a fencing device



On 10/09/2012 12:25 PM, Zama Ques wrote:
Hi All,

Need help in selecting the right fencing device for our HA cluster of
two nodes . The server hardware used is HP Proliant Servers and OS we
are using is CentOS 5

There are two options for us in selecting the fencing device .


One is selecting a SAN Brocade switch. In this case , we will use ILO as
secondary fencing device .

Other option for us is using HP ILO as primary fencing device and IPMI
fencing for secondary fencing


Of the two options which will be better to go for configuring fencing
.Any known issues with ILO or SAN Brocade switch in configuring fencing
?  Any suggestions will be greatly helpful.

Thanks
Zaman

There is no benefit to use fence_ilo and fence_ipmilan as they work on the same device... If one fails, the other will, too.

Personally, I'd use fence_ipmilan (more tested than fence_ilo) as primary and SAN fencing as a backup in case the out of band management fails (as could happen if the node lost it's power).

The reason I recommend the oob interface as primary is that power fencing has a chance of recovering the node where fabric fencing merely cuts it off, which is fine for fencing, but stays offline until an admin solves the problem and unfences the nodes.

--
Digimer
Papers and Projects: https://alteeve.ca/w/
"Hydrogen is just a colourless, odorless gas which, if left alone in sufficient quantities for long periods of time, begins to think about itself."


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