clustering with RHEL

                                               Hi!  

We´re running RHEL 4 and 5  clustering since some years now, and would 
like to use evms in clustering. Since RHEL is supporting multi-node 
clustering, I´m not sure how to use evms. Also, we would obviously not 
want to install Linux-HA to be able to use the clustering features.
 Steve mentioned the: "admin_mode" is set to "yes" in the "csm"
> section of /etc/evms.conf, which is not recommended since it can be very
> dangerous) 

In what way would that be dangerous to use? We´re experienced cluster 
admins. Would that help us in any way?

 We´re  using clustering both with multinode failover, and with multinode 
GFS.

 So, questions here are: How can we configure shared cluster 
containers(for GFS clustering) without installing Linux-HA?
And: How can we get a multinode failover?

               Best regards from/Med vänliga hälsningar från

                                 Johan Kragsterman

                               http://www.capvert.se




"Jose Jerez" <[email protected]>
Sänt av: [email protected]
2007-04-13 14:56

 
        Till:   "Steve Dobbelstein" <[email protected]>
        Kopia:  [email protected]
        Ärende: Re: [Evms-devel] iscsi and clustering


Excellent, I installed linux-HA and now the cluster segment manager is
shown as an option :-)

So I managed to create a private segment container, on top of that a
LVM2 container, then a LVM2 region and volumes that can be mounted.

BUT, I could detect the following problem: when the evms init script
is run, which basically executes the evms_activate command, the
following message appears:

abr 13 12:23:11  Engine: The plug-in Novell-HA in module
/lib/evms/2.5.5/hb2-1.0.0.so failed to load.  The plug-in's
setup_evms_plugin() function failed with error code 19: No existe el
dispositivo. (that is: device doen't exist)

After starting evmsgui the volume in the private cluster is not
active, so I figured out that linux-HA has to be started before
running evms_activate; but it takes a while for heartbeat to settle
down and allow the evms_activate to run without the previous error.
And this is an annoyance if I want to have the volume mounted from
/etc/fstab.  ¿Any suggestion on how to improve this?

Anyway my main concern right now is how to configure the private
cluster container as a resource in heartbeat; I see there's a document
in the web http://evms.sourceforge.net/install/cluster.html but it
seems outdated, at least for me because I'm using heartbeat v2 (2.0.7)
by the way evms is 2.5.5 all in SLES-10.  For my initial testing I
won't use STONITH, I'll deal with that later.

So my question again is: is it possible to have this configuration
done (evms 2.5.5 + heartbeat v2 2.0.7) + private cluster container) ?

if yes then
   How(hints);
else
  Damn(my luck);

Waiting for your wisdom to illuminate  me.

On 3/29/07, Steve Dobbelstein <[email protected]> wrote:
>
>
> "Jose Jerez" <[email protected]> wrote on 03/23/2007 05:59:19 AM:
>
>
>  > Hello everyone,
>  >
>  > I'm setting up a test environment with evms to try the clustering
>  > capabilities.  The common storage device is an iscsi target (exported
>  > from a SLES-10) and is accessible from two xen virtual machines (also
>  > SLES-10).
>  >
>  > The iscsi disk appears as sda in the "Available objects" and "Disks"
>  > Tabs, and is not shown in the Volumes tab; I can't remove any segment
>  > manager from the disk so I assume that it is seen as a clean new disk
>  > by evms.
>  >
>  > Now when I try to add a new segment manager to the disk the only
>  > options available are:
>  >
>  > DOS segment manager
>  > Bad block relocation segment manager
>  > GPT segment manager
>  >
>  > No cluster segment manager.
>  >
>  > ¿Any hints or directions on how to do this, if at all possible?
>
>  The Cluster Segment Manager requires that the machine belongs to the
> membership of a cluster (or that "admin_mode" is set to "yes" in the 
"csm"
> section of /etc/evms.conf, which is not recommended since it can be very
> dangerous) .  It can't safely create a CSM segment on a shared disk 
unless
> it can coordinate the creation with the other nodes in the cluster.
>
>  Being a member of a cluster implies that you are running some kind of
> cluster software (EVMS supports Linux-HA and IBM's RSCT), and that the
> machine is currently an active node in the cluster.  You will need to 
make
> sure EVMS is installed on all the nodes in the cluster so that it can
> coordinate the management of shared storage.
>
>  Steve D.
>
>

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