[Linux-cluster] Fencing agents

[JACOB_LIBERMAN at Dell.com]

Oops! Looks like I sent this 1 second too soon. 8) 

> -----Original Message-----
> From: linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of 
> JACOB_LIBERMAN at Dell.com
> Sent: Wednesday, August 03, 2005 4:42 PM
> To: linux-cluster at redhat.com
> Subject: RE: [Linux-cluster] Fencing agents
> 
> Hi Adam,
> 
> I noticed that you updated this script quite a bit from 
> previous versions. If I'm not mistaken, the previous version 
> actually used the "racadm serveraction 
> powercycle/shutdown/etc" commands. This version uses telnet 
> exclusively. How about adding some logic that checks whether 
> racadm is installed locally and uses that if it is, and then 
> uses telnet if it is not?
> 
> I think that adding the racadm commands to enable telnet on 
> the rac is a good idea, but if they can use racadm to 
> configure telnet access, they should also be able to use 
> racadm to fence the node.
> 
> Just my 2 cents. I think its great that you wrote an agent 
> for the drac.
> 
> Thanks, jacob 
> 
> > -----Original Message-----
> > From: linux-cluster-bounces at redhat.com 
> > [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Adam Manthei
> > Sent: Wednesday, August 03, 2005 4:30 PM
> > To: linux clustering
> > Subject: Re: [Linux-cluster] Fencing agents
> > 
> > On Wed, Aug 03, 2005 at 11:58:47AM +0000, "Sævaldur Arnar 
> Gunnarsson 
> > [Hugsmiðjan]" wrote:
> > > I'm implementing a shared storage between multiple (2 at
> > the moment)
> > > Blade machines (Dell PowerEdge 1855) running RHEL4 ES
> > connected to a
> > > EMC AX100 through FC.
> > >
> > > The SAN has two FC ports so the need for a FC Switch has
> > not yet come
> > > however we will add other Blades in the coming months.
> > > The one thing I haven't got figured out with GFS and the
> > Cluster-Suite
> > > is the whole idea about fencing.
> > 
> > Funny timing :)  I just checked in the fencing agent for 
> the PowerEdge 
> > 1855's a couple days ago!
> > 
> > (http://sources.redhat.com/cgi-bin/cvsweb.cgi/cluster/fence/ag
> > ents/drac/fence_drac.pl?rev=1.3.4.2&content-type=text/x-cvsweb
> > -markup&cvsroot=cluster)
> > 
> > > The fencing agents in that setup is manual fencing.
> > 
> > I would strongly discourage this.
> > 
> > > What does "automatic" fencing have to offer that the manual
> > fencing lacks.
> > > If we decide to buy the FC switch right away is it
> > recomended that we
> > > buy one of the ones that have fencing agent available for the 
> > > Cluster-Suite ?
> > 
> > In this case, you already have a fencing agent (fence_drac) 
> that works 
> > with the PE 1855 blades so there is no need for further fencing 
> > hardware (unless you are going to be connecting other 
> machines to the 
> > cluster that aren't going to have any other form of fencing)
> > 
> > The main advantage that "automatic" fencing gives you over manual 
> > fencing is that in the event that a fencing operation is required, 
> > your cluster can automatically recover (on the order of seconds to 
> > minutes) instead of waiting for user intervention (which can take 
> > minutes to hours to days depending on
> > how attentive the admins are :).    
> > 
> > --
> > Adam Manthei  <amanthei at redhat.com>
> > 
> > --
> > Linux-cluster mailing list
> > Linux-cluster at redhat.com
> > http://www.redhat.com/mailman/listinfo/linux-cluster
> > 
> 
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