[CentOS] Question about clustering
Digimer
lists at alteeve.ca
Sun Jun 15 15:28:56 UTC 2014
On 15/06/14 08:54 AM, Alessandro Baggi wrote:
> Another question is about fencing. I've ridden that a cluster must have
> fencing to be considered as such. On CentOS 6.5 there is stonith that
> concerns node level fencing. For this type of fencing I must have ilo,
> ilom, drac, and other. It's possible to have fencing without Light-out
> devices, blade power control device and other? There are other device
> that can be used for fencing? Supposing a 2 node cluster with two server
> assembled (no hp, dell, sun, ibm..) how I can implement fencing with
> stonith? I can run a cluster without fencing and what implies do not use
> fencing?
A lot of odd problems go away once fencing is working. So this is a good
time to sort this out, then go back and see if your problems remain.
A very good way to fence machines without IPMI (etc) is to use an
external switched PDU, like the APC AP7900 (or your country version on).
http://www.apc.com/resource/include/techspec_index.cfm?base_sku=ap7900
If your budget is tight, I have seen these models frequently go on sale
for ~$200 (Canadian).
These work be allowing another node to log into the PDU and turn off the
power going to the lost/failed node. Please do note that the brand of
switched PDU you buy matters. For a device to work for fencing, it must
be possible for the cluster to talk to it. This is done using a "fence
handler", and there are many types that are supported (APC, Eaton, etc).
So if you want to get a different make/model, please first make sure
there is a fence handler.
Once you get this setup, see if your problems remain. If so, there is a
good clustering mailing list at:
https://www.redhat.com/mailman/listinfo/linux-cluster
And if you're on freenode, #linux-cluster is also very good.
Cheers!
--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without
access to education?
More information about the CentOS
mailing list