System states reference
When IBM Netezza Appliance and
IBM Netezza Appliance is running, the
system and SPUs can transition through the following operational states. The states that end in the
letters
ing (such as Pausing, Pausing Now, Discovering) are typically transitional
states that are short in duration. The other states such as those described in Table 1
are usually the longer duration states; the system usually remains in those states until operator
action forces a state change. The following table describes all of the system states.
| State | Description |
|---|---|
| Down | The system is not configured (there is no configuration information for the data slices to
SPU topology) or there is not enough working hardware to operate the system even in failover. The SPUs can never be in this state. |
| Discovered | The SPUs and other components are discovered, but the system is waiting for all components to complete start-up before transitioning to the initializing state. |
| Discovering | The System Manager is in the process of discovering all the system components that it manages. |
| Going Offline | The system is in an interim state that is going to offline. |
| Going Offline (Now) | The system is in an interim state that is going to offline now. |
| Going Pre-Online | The system is in an interim state, going to pre-online. |
| Going to Maintain | |
| Initialized | The system uses this state during the initial startup sequence. |
| Initializing | The system is initializing. You cannot execute queries or transactions in this state. |
| Maintain | |
| Missing | The System Manager detected a new, unknown SPU in a slot that was previously occupied but not deleted. |
| Offline (Now) | This state is similar to offline, except that the system stops user jobs immediately during
the transition to offline. For more information, see Table 1.
|
| Online | The system is running normally. It can service requests. |
| Paused | The system is paused. You cannot run user jobs. |
| Paused (Now) | This state is similar to paused, except that the system stops user jobs immediately when it
transitions to paused. For more information, see Table 1.
|
| Pausing | The system is transitioning from online to paused. In this state, no new queries or transactions are queued, although the system allows current transactions to complete unless you used the nzsystem pause -now command. |
| Pausing Now | The system is attempting to pause because of a hardware failure, or the administrator entered the nzsystem pause -now command. |
| Pre-Online | The system has completed initialization. The system goes to the resume state. |
| Resuming | The system is waiting for all its components (SPUs and host processes) to reach the online state before it changes the system state to online. |
| Stopped | The system is not running. Commands assume this state when they attempt to connect to a
system and get no response. The SPUs can never be in this state. |
| Stopped (Now) | This state is similar to stopped, except that the system stops user jobs immediately when it makes the transition to stopped. |
| Stopping | The system is transitionimg from online to stopped. |
| Stopping Now | The system is attempting to stop, or the administrator entered the nzsystem stop -now command. |
| Unreachable | The System Manager cannot communicate with the SPU because it has failed or it was physically removed from the system. |