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When a TrueNAS system is first created, the system dataset is stored on the boot pool. When the first data pool is created it is automatically moved from the boot pool to that first data pool. In System>System Dataset one may elect the system dataset pool location. If it's not on the datapool the daily config save won't be there either, but on the boot pool device (which may, depending on its choice, be "ephemeral").
See
7.6. System Dataset
System ➞ System Dataset, shown in Figure 7.6.1, is used to select the pool which contains the persistent system dataset. The system dataset stores debugging core files, encryption keys for encrypted pools, and Samba4 metadata such as the user/group cache and share level permissions.
Fig. 7.6.1 System Dataset Screen
Use the System Dataset Pool drop-down menu to select the volume (pool) to contain the system dataset. The system dataset can be moved to unencrypted volumes (pools) or encrypted volumes which do not have passphrases. If the system dataset is moved to an encrypted volume, that volume is no longer allowed to be locked or have a passphrase set.
Moving the system dataset also requires restarting the SMB service. A dialog warns that the SMB service must be restarted, causing a temporary outage of any active SMB connections.
System logs can also be stored on the system dataset. Storing this information on the system dataset is recommended when large amounts of data is being generated and the system has limited memory or a limited capacity operating system device.
Set Syslog to store system logs on the system dataset. Leave unset to store system logs in /var on the operating system device.
Click SAVE to save changes.
If the pool storing the system dataset is changed at a later time, FreeNAS® migrates the existing data in the system dataset to the new location.
Note
Depending on configuration, the system dataset can occupy a large amount of space and receive frequent writes. Do not put the system dataset on a flash drive or other media with limited space or write life.
See
7.6. System Dataset
System ➞ System Dataset, shown in Figure 7.6.1, is used to select the pool which contains the persistent system dataset. The system dataset stores debugging core files, encryption keys for encrypted pools, and Samba4 metadata such as the user/group cache and share level permissions.
Fig. 7.6.1 System Dataset Screen
Use the System Dataset Pool drop-down menu to select the volume (pool) to contain the system dataset. The system dataset can be moved to unencrypted volumes (pools) or encrypted volumes which do not have passphrases. If the system dataset is moved to an encrypted volume, that volume is no longer allowed to be locked or have a passphrase set.
Moving the system dataset also requires restarting the SMB service. A dialog warns that the SMB service must be restarted, causing a temporary outage of any active SMB connections.
System logs can also be stored on the system dataset. Storing this information on the system dataset is recommended when large amounts of data is being generated and the system has limited memory or a limited capacity operating system device.
Set Syslog to store system logs on the system dataset. Leave unset to store system logs in /var on the operating system device.
Click SAVE to save changes.
If the pool storing the system dataset is changed at a later time, FreeNAS® migrates the existing data in the system dataset to the new location.
Note
Depending on configuration, the system dataset can occupy a large amount of space and receive frequent writes. Do not put the system dataset on a flash drive or other media with limited space or write life.
