| PRIMECLUSTER Global Disk Services Configuration and Administration Guide 4.2 (Linux) |
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| Appendix A General Notes | > A.2 Important Points |
Understand and pay attention to the following points when changing the configuration in a cluster system.
Before registering disks with a class, perform resource registration and register shared disk units with the PRIMECLUSTER resource database.
For details on resource registration, see "Shared Disk Unit Resource Registration."
Disks that have not been registered with the resource database yet cannot be registered with a shared class.
Disks that have not been registered with the resource database yet can be registered with a root class [Itanium] or a local class [Linux2.6].
When expanding the scope of a local class to which disks not registered with the resource database belong into a shared class, perform resource registration in advance, and register all disks that belong to the local class with the resource database.
For disks to be registered with a shadow class, disk resource creation is not required.
Do not register certain disks with the resource database in multiple cluster domains.
To perform object operations in a cluster system, enable cluster control. If cluster control is "off", it is impossible to perform shared object operations. Additionally, root and local object operations may cause errors or inconsistency.
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