[Linux-cluster] RE: < fecing with out any hardware? >
Bowie_Bailey at BUC.com
Mon May 1 20:15:43 UTC 2006
Pool Lee, Mr <14117614 at sun.ac.za> wrote:
> What about software fencing? Is it really nesasary to be hardware!
> Is there a difference between lutre/cfs, the product that sun uses,
> and gfs?
> I'm planning to do mostly numerical work with the cluster and thus I
> would like all the machines to be able to retrieve data, as if it
> was local on the machine. NFS is very limited in this regard because
> we intend on using vast arrays of matrices, that can be up to 1-2
> I was hoping to implement GFS since all the machines are already
> setup, without the hardware fencing though.
The thing with fencing is that you have to choose a method which is
supported by your configuration. These are the basic ways to fence a
Manual fencing - nothing special needed, but it doesn't work well in a
Power fencing - Forcibly reboots a misbehaving node. Requires a
compatible power switch.
Network fencing - Blocks the misbehaving node's access to the cluster
resources. Requires a compatible switch (usually used with fiber
Software fencing - Notifies storage management software to block
access to the misbehaving node. Requires compatible storage
configuration. I believe this is only supported with GNBD storage
Your choices are limited by your configuration. The only options that
can be used with any configuration are manual and power.
I don't know about the differences between the RedHat Clustering and
lutre/cfs. I DO know that any type of clustering will require fencing
of some sort.
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