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[Linux-cluster] Re: [RFC] DRBD + GFS cookbook (Lon Hohberger)



On Fri, 2007-12-07 at 07:13 +0100, Ante Karamatić wrote:
> On Thu, 06 Dec 2007 17:34:21 -0500
> Lon Hohberger <lhh redhat com> wrote:
> 
> > fabioc (!= fabbione) and I did this today:
> > 
> > http://gfs.wikidev.net/DRBD_Cookbook
> > 
> > I only did very basic testing, but it's a start.
> 
> I'm using exactly the same setup, except fencing trough DRBD, on
 Ubuntu
> and can only confirm that this works as expected.

Could you expand on this -- do you have the script that drbd is calling
for fencing?

I assume you're using 'resource', right?  "Ssh to the other guy and
issue some command..."

-- Lon



>On Fri, 2007-12-07 at 07:13 +0100, Ante Karamatić wrote:
> On Thu, 06 Dec 2007 17:34:21 -0500
> Lon Hohberger <lhh redhat com> wrote:
> 
> > fabioc (!= fabbione) and I did this today:
> > 
> > http://gfs.wikidev.net/DRBD_Cookbook
> > 
> > I only did very basic testing, but it's a start.
> 
> I'm using exactly the same setup, except fencing trough DRBD, on
 Ubuntu
> and can only confirm that this works as expected.
>
>Could you expand on this -- do you have the script that drbd is calling
>for fencing?
>
>I assume you're using 'resource', right?  "Ssh to the other guy and
>issue some command..."
>
>-- Lon

We are using a similar setup with a three node cluster. The third node mounts the gfs volumes through a manged NFS service. All three cluster nodes act as servers for diskless nodes ( XDMCP through LVS).
We have observed few issues though.
1) On the drbd nodes, we have root partition on a logical volume. Also our drbd+gfs disks are clustered LV's; So we had to manually restart clvmd after drbd in order for the gfs volumes to be active.
2) The manged NFS service refuses to failover. I am not sure whether this is because of manual fencing. Our APC MasterSwitch is expected shortly so will know more about NFS failover after we have proper fencing setup.
I would be very interested in trying this fencing through DRBD..
3) The disk IO is very slow. Almost a bottleneck. I wonder getting rid of the LV's & making gfs directly on the drbd device might help?

Another question may be OT sorry if so. Is there a way to failover the diskless nodes to other cluster server in case of one cluster server going down?
 
With warm regards
Koustubha Kale




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