8.8. Testing the Configuration
It is important that all SCSI fencing requirements be met in order for your system to successfully fence a node using SCSI persistent reservations. The SCSI fencing requirements are noted in Section 8.2, “SCSI Fencing Requirements and Limitations”. To ensure that your system meets these requirements, you should test your configuration.
After the
cluster.conf has been set up on all of the nodes in the system, you can perform the following procedure to verify that all of the requirements have been met for SCSI fencing and that the configuration is successful.
- For every node in the cluster, you should verify that the necessary infrastructure is up and running:
- Ensure that the cluster infrastructure is up and running on every node in the cluster; you can check this with the
cman_tool statuscommand. - Ensure that the
clvmddaemon is running; you can check this with theservice clvmd statuscommand. - Ensure that the
scsi_reserveservice has been turned on by executing thechkconfig scsi_reserve oncommand.
- Set up cluster LVM volumes to test.
[root@tng3-1 ~]#
pvcreate /dev/sda1 /dev/sdb1 /dev/sdc1[root@tng3-1 ~]#
vgcreate new_vol_group /dev/sda1 /dev/sdb1 /dev/sdc1[root@tng3-1 ~]#
lvcreate -L2G -n new_logical_volume new_vol_group[root@tng3-1 ~]#
gfs_mkfs -plock_nolock -j 1 /dev/new_vol_group/new_logical_volume[root@tng3-1 ~]#
mount /dev/new_vol_group/new_logical_volume /mnt - Run the
scsi_reserveinitscript on all nodes, and then check to see whether this worked.[root@clusternode1 ~]#
service scsi_reserve start[root@clusternode1 ~]#service scsi_reserve status[root@clusternode2 ~]#service scsi_reserve start[root@clusternode2 ~]#service scsi_reserve status[root@clusternode3 ~]#service scsi_reserve start[root@clusternode3 ~]#service scsi_reserve status - Execute the following commands and check whether the nodes have been fenced.
#
/sbin/fence_node clusternode1.example.com#/sbin/fence_node clusternode2.example.com#/sbin/fence_node clusternode3.example.com
