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Configuration

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Once the Cluster/iX product is installed, perform the following steps to configure the systems and to convert the required user volume set to a cluster volume set:
  1. Connect the primary and the secondary systems to a multiported volume set but only configure the ldevs for the primary system, leaving the configuration of the secondary system for later.

  2. Verify that the MPE program SXOutil and the catalog SXCAT000 are properly installed in the group PUB.SYS for the primary and secondary systems, by using the LISTF command.

  3. Using the cluster utility SXOutil, create (cmd: SXOMAKELABEL) the Cluster ID block on the primary system. This will convert your volume set into a cluster volume set. Please refer to the help facility within SXOutil for more details about the command.

  4. VSCLOSE the newly created cluster volume set.

  5. VSOPEN the cluster volume sets. Every cluster volume set can be owned by only one system belonging to the cluster at any time. The system that initiates creation of the cluster volume set will be the initial owner of the disk and is allowed to perform disk operations on these disks after mounting (VSOPENing).

  6. Execute the DSTAT command to verify that the cluster volume sets are created properly. DSTAT will display all cluster volume sets as "MASTER-SX" & "MEMBER-SX".

  7. Configure the ldevs on the secondary system by using SYSGEN or IOCONFIG. As each of the drives is recognized by the operating system, they will mount automatically as "LONER." Neither VSOPEN nor VSCLOSE should change the state from the secondary computer.

Secondary System

When the primary/host system experiences an outage, a switchover operation must be initiated. The currently active/secondary system needs to take ownership of all the cluster volume sets that the primary host/system owned. This is termed as "taking control or switchover" of a cluster volume set which is mounted as loner on the secondary system.

This is accomplished by the SXOSETLABEL command within SXOutil and followed by issuing the VSOPEN command.

The currently active/secondary system overrides the "Ownership Label" on the disks owned by the primary/host system, and assigns its "Ownership Label" on the disks owned by the primary/host system. Only then can the active/secondary system mount or VSOPEN the cluster volume set. On the completion of the switchover operation, these volumes will be mounted as master and member volumes, respectively, on the currently active/secondary system.

Once the secondary system has taken control of the cluster volume sets, reboot the primary system and verify that the cluster volume sets are automatically mounted as loner within the primary/host system.

Configuration Restrictions

It is **IMPORTANT** to note that when a "Ownership Label" is being created or being reset to the secondary active system, the other system should be shutdown, or must have done a VSCLOSE of the volume set.

Recreating a volume set and converting to a cluster volume set should be done only when the primary system can "see" the volumes. Failure to do so will cause the secondary to have stale data on its system data structure, forcing a reboot to refresh the structures.



Requirements

SXOutil