You can configure server-based I/O fencing for the VCS cluster using the installer.
With server-based fencing, you can have the coordination points in your configuration as follows:
Combination of CP servers and SCSI-3 compliant coordinator disks
CP servers only
Veritas also supports server-based fencing with a single highly available CP server that acts as a single coordination point.
See About planning to configure I/O fencing.
See Recommended CP server configurations.
This section covers the following example procedures:
Mix of CP servers and coordinator disks |
See “To configure server-based fencing for the VCS cluster (one CP server and two coordinator disks)”. |
Single CP server |
See “To configure server-based fencing for the VCS cluster”. |
To configure server-based fencing for the VCS cluster (one CP server and two coordinator disks)
Depending on the server-based configuration model in your setup, make sure of the following:
CP servers are configured and are reachable from the VCS cluster. The VCS cluster is also referred to as the application cluster or the client cluster.
The coordination disks are verified for SCSI3-PR compliance.
# /opt/VRTS/install/installer -fencing
The installer starts with a copyright message and verifies the cluster information.
Note the location of log files which you can access in the event of any problem with the configuration process.
The program checks that the local node running the script can communicate with remote nodes and checks whether VCS 7.3 is configured properly.
Select the fencing mechanism to be configured in this Application Cluster [1-3,b,q] 1
Does your storage environment support SCSI3 PR? [y,n,q] (y)
Provide the following details about the coordination points at the installer prompt:
Enter the total number of coordination points including both servers and disks. This number should be at least 3.
Enter the total number of co-ordination points including both Coordination Point servers and disks: [b] (3)
Enter the total number of coordinator disks among the coordination points.
Enter the total number of disks among these: [b] (0) 2
Provide the following CP server details at the installer prompt:
Enter the total number of virtual IP addresses or the total number of fully qualified host names for each of the CP servers.
How many IP addresses would you like to use to communicate to Coordination Point Server #1?: [b,q,?] (1) 1
Enter the virtual IP addresses or the fully qualified host name for each of the CP servers. The installer assumes these values to be identical as viewed from all the application cluster nodes.
Enter the Virtual IP address or fully qualified host name #1 for the HTTPS Coordination Point Server #1: [b] 10.209.80.197
The installer prompts for this information for the number of virtual IP addresses you want to configure for each CP server.
Enter the port that the CP server would be listening on.
Enter the port that the coordination point server 10.209.80.197 would be listening on or accept the default port suggested: [b] (443)
Provide the following coordinator disks-related details at the installer prompt:
Choose the coordinator disks from the list of available disks that the installer displays. Ensure that the disk you choose is available from all the VCS (application cluster) nodes.
The number of times that the installer asks you to choose the disks depends on the information that you provided in step 6. For example, if you had chosen to configure two coordinator disks, the installer asks you to choose the first disk and then the second disk:
Select disk number 1 for co-ordination point 1) sdx 2) sdy 3) sdz Please enter a valid disk which is available from all the cluster nodes for co-ordination point [1-3,q] 1
If you have not already checked the disks for SCSI-3 PR compliance in step 1, check the disks now.
The installer displays a message that recommends you to verify the disks in another window and then return to this configuration procedure.
Press Enter to continue, and confirm your disk selection at the installer prompt.
Enter a disk group name for the coordinator disks or accept the default.
Enter the disk group name for coordinating disk(s): [b] (vxfencoorddg)
For example:
Total number of coordination points being used: 3 Coordination Point Server ([VIP or FQHN]:Port): 1. 10.209.80.197 ([10.209.80.197]:443) SCSI-3 disks: 1. sdx 2. sdy Disk Group name for the disks in customized fencing: vxfencoorddg Disk policy used for customized fencing: dmp
The installer initializes the disks and the disk group and deports the disk group on the VCS (application cluster) node.
CPS Admin utility location: /opt/VRTScps/bin/cpsadm Cluster ID: 2122 Cluster Name: clus1 UUID for the above cluster: {ae5e589a-1dd1-11b2-dd44-00144f79240c}
/etc/vxfenmode
file with the appropriate details in each of the application cluster nodes.Updating client cluster information on Coordination Point Server 10.209.80.197 Adding the client cluster to the Coordination Point Server 10.209.80.197 .......... Done Registering client node sys1 with Coordination Point Server 10.209.80.197...... Done Adding CPClient user for communicating to Coordination Point Server 10.209.80.197 .... Done Adding cluster clus1 to the CPClient user on Coordination Point Server 10.209.80.197 .. Done Registering client node sys2 with Coordination Point Server 10.209.80.197 ..... Done Adding CPClient user for communicating to Coordination Point Server 10.209.80.197 .... Done Adding cluster clus1 to the CPClient user on Coordination Point Server 10.209.80.197 ..Done Updating /etc/vxfenmode file on sys1 .................................. Done Updating /etc/vxfenmode file on sys2 ......... ........................ Done
Do you want to configure Coordination Point Agent on the client cluster? [y,n,q] (y) Enter a non-existing name for the service group for Coordination Point Agent: [b] (vxfen)
Note that for the LevelTwoMonitorFreq attribute to be applicable there must be disks as part of the Coordinator Disk Group.
Enter the value of the LevelTwoMonitorFreq attribute: (5)
Do you want to enable auto refresh of coordination points if registration keys are missing on any of them? [y,n,q,b,?] (n)
# vxfenadm -d
# vxfenconfig -l
To configure server-based fencing for the VCS cluster
# /opt/VRTS/install/installer -fencing
The installer starts with a copyright message and verifies the cluster information.
Note the location of log files which you can access in the event of any problem with the configuration process.
The program checks that the local node running the script can communicate with remote nodes and checks whether VCS 7.3 is configured properly.
Select the fencing mechanism to be configured in this Application Cluster [1-7,q] 1
Does your storage environment support SCSI3 PR? [y,n,q] (y)
Enter the total number of co-ordination points including both Coordination Point servers and disks: [b] (3) 1
Read the installer warning carefully before you proceed with the configuration.
Provide the following CP server details at the installer prompt:
Enter the total number of virtual IP addresses or the total number of fully qualified host names for each of the CP servers.
How many IP addresses would you like to use to communicate to Coordination Point Server #1? [b,q,?] (1) 1
Enter the virtual IP address or the fully qualified host name for the CP server. The installer assumes these values to be identical as viewed from all the application cluster nodes.
Enter the Virtual IP address or fully qualified host name #1 for the Coordination Point Server #1: [b] 10.209.80.197
The installer prompts for this information for the number of virtual IP addresses you want to configure for each CP server.
Enter the port that the CP server would be listening on.
Enter the port in the range [49152, 65535] which the Coordination Point Server 10.209.80.197 would be listening on or simply accept the default port suggested: [b] (443)
For example:
Total number of coordination points being used: 1 Coordination Point Server ([VIP or FQHN]:Port): 1. 10.209.80.197 ([10.209.80.197]:443)
CPS Admin utility location: /opt/VRTScps/bin/cpsadm Cluster ID: 2122 Cluster Name: clus1 UUID for the above cluster: {ae5e589a-1dd1-11b2-dd44-00144f79240c}
/etc/vxfenmode
file with the appropriate details in each of the application cluster nodes.The installer also populates the /etc/vxfenmode
file with the entry single_cp=1 for such single CP server fencing configuration.
Updating client cluster information on Coordination Point Server 10.209.80.197 Adding the client cluster to the Coordination Point Server 10.209.80.197 .......... Done Registering client node sys1 with Coordination Point Server 10.209.80.197...... Done Adding CPClient user for communicating to Coordination Point Server 10.209.80.197 .... Done Adding cluster clus1 to the CPClient user on Coordination Point Server 10.209.80.197 .. Done Registering client node sys2 with Coordination Point Server 10.209.80.197 ..... Done Adding CPClient user for communicating to Coordination Point Server 10.209.80.197 .... Done Adding cluster clus1 to the CPClient user on Coordination Point Server 10.209.80.197 .. Done Updating /etc/vxfenmode file on sys1 .................................. Done Updating /etc/vxfenmode file on sys2 ......... ........................ Done
Do you want to configure Coordination Point Agent on the client cluster? [y,n,q] (y) Enter a non-existing name for the service group for Coordination Point Agent: [b] (vxfen)
Do you want to enable auto refresh of coordination points if registration keys are missing on any of them? [y,n,q,b,?] (n)