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Sun Cluster Software Installation Guide for Solaris OS

ProcedureHow to Configure Quorum Devices

Note –

You do not need to configure quorum devices in the following circumstances:

Instead, proceed to How to Verify the Quorum Configuration and Installation Mode.

Perform this procedure one time only, after the new cluster is fully formed. Use this procedure to assign quorum votes and then to remove the cluster from installation mode.

Before You Begin

  1. If both of the following conditions apply, modify the netmask file entries for the public network on each cluster node.

    • You intend to use a quorum server.

    • The public network uses variable-length subnet masking, also called classless inter domain routing (CIDR).

    If you use a quorum server but the public network uses classful subnets, as defined in RFC 791, you do not need to perform this step.

    1. Add to the /etc/inet/netmasks file an entry for each public subnet that the cluster uses.

      The following is an example entry that contains a public-network IP address and netmask:


      10.11.30.0	255.255.255.0

    2. Append netmask + broadcast + to the hostname entry in each /etc/hostname.adapter file.


      nodename netmask + broadcast +

  2. On one node, become superuser.

  3. Ensure that all cluster nodes are online.


    phys-schost# cluster status -t node

  4. To use a shared disk as a quorum device, verify device connectivity to the cluster nodes and choose the device to configure.

    1. From one node of the cluster, display a list of all the devices that the system checks.

      You do not need to be logged in as superuser to run this command.


      phys-schost-1# cldevice list -v

      Output resembles the following:


      DID Device          Full Device Path
----------          ----------------
d1                  phys-schost-1:/dev/rdsk/c0t0d0
d2                  phys-schost-1:/dev/rdsk/c0t6d0
d3                  phys-schost-2:/dev/rdsk/c1t1d0
d3                  phys-schost-1:/dev/rdsk/c1t1d0
…

    2. Ensure that the output shows all connections between cluster nodes and storage devices.

    3. Determine the global device-ID name of each shared disk that you are configuring as a quorum device.

      Note –

      Any shared disk that you choose must be qualified for use as a quorum device. See Quorum Devices for further information about choosing quorum devices.

      Use the scdidadm output from Step a to identify the device–ID name of each shared disk that you are configuring as a quorum device. For example, the output in Step a shows that global device d3 is shared by phys-schost-1 and phys-schost-2.

  5. To use a shared disk that does not support the SCSI protocol, ensure that fencing is disabled for that shared disk.

    1. Display the fencing setting for the individual disk.


      phys-schost# cldevice show device

=== DID Device Instances ===
DID Device Name:                                      /dev/did/rdsk/dN
…
  default_fencing:                                     nofencing
…

      • If fencing for the disk is set to nofencing or nofencing-noscrub, fencing is disabled for that disk. Go to Step 6.

      • If fencing for the disk is set to pathcount or scsi, disable fencing for the disk. Skip to Step c.

      • If fencing for the disk is set to global, determine whether fencing is also disabled globally. Proceed to Step b.

        Alternatively, you can simply disable fencing for the individual disk, which overrides for that disk whatever value the global_fencing property is set to. Skip to Step c to disable fencing for the individual disk.

    2. Determine whether fencing is disabled globally.


      phys-schost# cluster show -t global

=== Cluster ===
Cluster name:                                         cluster
…
   global_fencing:                                      nofencing
…

      • If global fencing is set to nofencing or nofencing-noscrub, fencing is disabled for the shared disk whose default_fencing property is set to global. Go to Step 6.

      • If global fencing is set to pathcount or prefer3, disable fencing for the shared disk. Proceed to Step c.

      Note –

      If an individual disk has its default_fencing property set to global, the fencing for that individual disk is disabled only while the cluster-wide global_fencing property is set to nofencing or nofencing-noscrub. If the global_fencing property is changed to a value that enables fencing, then fencing becomes enabled for all disks whose default_fencing property is set to global.

    3. Disable fencing for the shared disk.


      phys-schost# cldevice set \
-p default_fencing=nofencing-noscrub device

    4. Verify that fencing for the shared disk is now disabled.


      phys-schost# cldevice show device

  6. Start the clsetup utility.


    phys-schost# clsetup

    The Initial Cluster Setup screen is displayed.

    Note –

    If the Main Menu is displayed instead, initial cluster setup was already successfully performed. Skip to Step 11.

  7. Answer the prompt Do you want to add any quorum disks?.

    • If your cluster is a two-node cluster, you must configure at least one shared quorum device. Type Yes to configure one or more quorum devices.

    • If your cluster has three or more nodes, quorum device configuration is optional.

      • Type No if you do not want to configure additional quorum devices. Then skip to Step 10.

      • Type Yes to configure additional quorum devices. Then proceed to Step 8.

  8. Specify what type of device you want to configure as a quorum device.

    Note –

    NAS devices are not a supported option for quorum devices in an Sun Cluster 3.2 11/09 configuration. Reference to NAS devices in the following table are for information only.

    Quorum Device Type 

    Description 

    shared_disk

    Sun NAS device or shared disk 

    quorum_server

    Quorum server 

    netapp_nas

    Network Appliance NAS device 

  9. Specify the name of the device to configure as a quorum device.

    • For a quorum server, also specify the following information:

      • The IP address of the quorum server host

      • The port number that is used by the quorum server to communicate with the cluster nodes

    • For a Network Appliance NAS device, also specify the following information:

      • The name of the NAS device

      • The LUN ID of the NAS device

  10. At the prompt Is it okay to reset "installmode"?, type Yes.

    After the clsetup utility sets the quorum configurations and vote counts for the cluster, the message Cluster initialization is complete is displayed. The utility returns you to the Main Menu.

  11. Quit the clsetup utility.

Next Steps

Verify the quorum configuration and that installation mode is disabled. Go to How to Verify the Quorum Configuration and Installation Mode.

Troubleshooting

Interrupted clsetup processing - If the quorum setup process is interrupted or fails to be completed successfully, rerun clsetup.

Changes to quorum vote count – If you later increase or decrease the number of node attachments to a quorum device, the quorum vote count is not automatically recalculated. You can reestablish the correct quorum vote by removing each quorum device and then add it back into the configuration, one quorum device at a time. For a two-node cluster, temporarily add a new quorum device before you remove and add back the original quorum device. Then remove the temporary quorum device. See the procedure “How to Modify a Quorum Device Node List” in Chapter 6, Administering Quorum, in Sun Cluster System Administration Guide for Solaris OS.