Re: iscsi and clustering

"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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