Re: Setting up linux cluster - need help

[Tom Coughlan <coughlan@redhat.com>]

On Thu, 2003-03-20 at 12:11, Nir Livni wrote: 
> I am trying to setup a linux cluster using two nodes, an external SCSI
> storage, and RedHat Advanced Server ver 2.1.
>  
> My scsi adapter on both nodes is ADAPTEC 29160N.
>  
> After installing both nodes,
>  
> I notices that once node A is up, it is able to access the SCSI drive
> (using: fdisk /dev/sda).
> Once node B is up, it "steals" the SCSI drive, and it is no longer available
> to the node A.
> running fdisk again on the first node - hangs.
>  
> When I try the node B to start first, node A steals it after it comes up
> second...

The way to start diagnosing this is to determine whether both systems
can reliably access the shared storage without any clustering software
turned on. You could bring up one system and have it exercise one
partition on a shared disk and have the other system exercise a
different partition on the same shared disk.

I have not had any good results with multi-initiator Ultra2 SCSI buses. 
As a result, you should note that the Red Hat Cluster Manager does not
support multi-initiator SCSI for shared storage.  You must use an
external RAID box with multiple host ports, and connect one host per
host port.  This is the only way to get reliable results.

-
Linux-cluster: generic cluster infrastructure for Linux
Archive:       http://mail.nl.linux.org/linux-cluster/