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Facilità d'uso
High Availability Cluster/iX
Configuration
Configuration
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.
Chapter 1
7
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