Check Unity System Health | Teradata Unity - Checking Unity System Health - Continuous Availability

If the Unity system is undergoing planned maintenance, wait until the maintenance window is complete before checking system health.

Do one of the following:
- Log on to the primary or standby Unity server as root user
- Log on to the primary or standby Unity server as another user with sudo privileges.
At the Linux prompt, run the following command:
```
unity status
```
Confirm that the following processes are in a running status:
- Watchdog
- Sequencer
- Endpoint
- All Dispatcher processes
If a process is not running run the following command at the Linux prompt to start the process:
```
unity start <processName>
```

Do one of the following:

Status	Action
Process started	Investigate why the process was not running previously. If the reason the process was not running previously is unexpected or cannot be determined, contact Teradata Customer Support.
Process did not start	Do one of the following: Check if the standby sequencer can reach the managed databases and primary sequencer. Check if the primary sequencer can reach the managed databases and standby sequencer. Do one of the following: If a sequencer can reach the managed system and other sequencer, run the following command at the Linux prompt: unity start <processName> If a sequencer cannot reach the managed databases and the sequencer, open an incident. At the Linux prompt, run the following command to check how much disk space is left for the partition containing the /data/directory: df -H If the partition is more than 80% full, contact Teradata Customer Support for instructions on removing files in the /data/directory. At the Linux prompt, run the following command to check for TVC messages raised since the last check that may be of concern: grep “Unity:” /var/log/messages

Status

Action

Process started

Investigate why the process was not running previously.
If the reason the process was not running previously is unexpected or cannot be determined, contact Teradata Customer Support.

Process did not start

Do one of the following:
- Check if the standby sequencer can reach the managed databases and primary sequencer.
- Check if the primary sequencer can reach the managed databases and standby sequencer.
Do one of the following:
- If a sequencer can reach the managed system and other sequencer, run the following command at the Linux prompt:
```
unity start <processName>
```
- If a sequencer cannot reach the managed databases and the sequencer, open an incident.
At the Linux prompt, run the following command to check how much disk space is left for the partition containing the /data/directory:
```
df -H
```
If the partition is more than 80% full, contact Teradata Customer Support for instructions on removing files in the /data/directory.
At the Linux prompt, run the following command to check for TVC messages raised since the last check that may be of concern:
```
grep “Unity:” /var/log/messages 
```

Check Unity System Health | Teradata Unity - Checking Unity System Health - Continuous Availability - Teradata Unity