Disk-space initialization always includes the initialization of shared memory. However, some activities that normally take place during shared-memory initialization, such as recording configuration changes, are not required during disk initialization because those activities are not relevant with a newly initialized disk.
Table 10 shows the main tasks completed during the two types of initialization. The following sections discuss each step.
| Shared-Memory Initialization | Disk Initialization |
|---|---|
| Process configuration file. | Process configuration file. |
| Create shared-memory segments. | Create shared-memory segments. |
| Initialize shared-memory structures. | Initialize shared-memory structures. |
| Initialize disk space. | |
| Start all required virtual processors. | Start all required virtual processors. |
| Make necessary conversions. | |
| Initiate fast recovery. | |
| Initiate a checkpoint. | Initiate a checkpoint. |
| Document configuration changes. | |
| Update oncfg_servername.servernum file. | Update oncfg_servername.servernum file. |
| Change to quiescent mode. | Change to quiescent mode. |
| Drop temporary tblspaces (optional). | |
| Set forced residency, if requested. | Set forced residency, if specified. |
| Change to online mode and return control to user. | Change to online mode and return control to user. |
| If the SMI tables are not current, update the tables. | Create SMI tables. |