Adding A Node That Was Prevously In The Cluster; Cluster Maintenance Mode; Shutting Down Linux Servers When Servicing Shared Storage; Preventing Cluster Node Reboot After Node Shutdown - Novell OPEN ENTERPRISE SERVER CLUSTER SERVICES 1.8.2 - ADMINISTRATION Manual

If you are connecting to an iSCSI target that already has NSS partitions and pools created on it, you
may not be able to access those NSS partitions and pools until you either reboot the Linux intitiator
server or run the evms_activate command at the Linux server console. This is required for each
Linux initiator server that will access the iSCSI target.

4.6.2 Adding a Node That Was Prevously in the Cluster

1 If necessary, install NetWare and Novell Cluster Services, including the latest Service Pack on
2 If the Cluster object for the server is still present, use ConsoleOne
3 Run the Novell Cluster Services installation.

4.6.3 Cluster Maintenance Mode

Cluster maintenance mode lets you temporarily suspend the cluster heartbeat while hardware
maintenance is being performed. This is useful if you want to reset or power down the LAN switch
without bringing down cluster servers. See
Commands," on page 50
If the master server in the cluster goes down while the cluster is in cluster maintenance mode, you
must enter cluster maintenance off on all remaining cluster servers to bring the cluster out
of maintenance mode. This is only necessary if the master server in the cluster goes down. If the
master server in the cluster is up, you can enter cluster maintenance off on one server in
the cluster to bring the entire cluster out of maintenance mode.
4.6.4 Shutting Down Linux Servers When Servicing Shared
Storage
If you need to power down or recycle your shared storage system, you should shut down Linux
Cluster Servers prior to doing so.

4.6.5 Preventing Cluster Node Reboot after Node Shutdown

If LAN connectivity is lost between a cluster node and the other nodes in the cluster, it is possible
that the lost node will be automatically shut down by the other cluster nodes. This is normal cluster
operating behavior, and it prevents the lost node from trying to load cluster resources because it
cannot detect the other cluster nodes.
By default, cluster nodes are configured to reboot after an automatic shutdown. On certain
occasions, you might want to prevent a downed cluster node from rebooting so you can troubleshoot
problems. To do this, edit the opt/novell/ncs/bin/ldncs file and find the following line:
echo -n $TOLERANCE > /proc/sys/kernel/panic
Replace $TOLERANCE with 0 to cause the server to not automatically reboot after a shutdown.
After editing the ldncs file, you must reboot the server to cause the change to take effect.
58 OES Novell Cluster Services 1.8.2 Administration Guide for Linux
the server using the same node name and IP address.
If your SAN is not configured, install Novell Cluster Services after configuring the SAN.
You can do this by going to the Cluster container, selecting the node in the right frame, and
pressing Delete.
The node will assume its former identity.
for more information.
Section 4.3, "Novell Cluster Services Console
®
to delete the object.