[Linux-cluster] RE: < fecing with out any hardware? >

[Arnd]

Bowie Bailey wrote:
> Pool Lee, Mr <14117614 at sun.ac.za> wrote:
>> What about software fencing? Is it really nesasary to be hardware!
> 
> Your choices are limited by your configuration.  The only options that
> can be used with any configuration are manual and power.

I was testing a few possibilities of fencing. GFS expects from the 
fencing script the status "0" to decide if it was successfull. So you 
can specify any script by your own in the cluster.conf. (Please correct 
me, if I'm wrong)

This script can be an automatic login to the failed server (ssh, rlogin, 
serial console) which can execute any remote operation (for example 
unload the module of the SAN-device) or causing an kernel panic (which 
is the fencing-method in ocfs2 ;-) ).

Your fencing-script must assure that the failed host doesn't have access 
to the filesystem anymore!

Arnd