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System Dataset

  2 minute read.

Last Modified 2021-07-26 16:05 EDT

The system dataset stores debugging core files, encryption keys for encrypted pools, and Samba4 metadata such as the user and group cache and share level permissions.

To view the current location of the system dataset, go to System > System Dataset.


Change System Dataset

Users can change the system dataset by selecting an existing pool from the System Dataset Pool dropdown.

Users can also move the system dataset to unencrypted pools or encrypted pools that do not have passphrases.

Moving the system dataset to an encrypted pool disables that volume’s passphrase capability.

You cannot move the system dataset to a passphrase-encrypted pool or a read-only pool.

Reboots Required

  • The SMB service must restart, which causes a brief outage for any active SMB connections.
  • Highly Available TrueNAS systems must reboot the standby controller when the system dataset moves.

If a user changes the pool storing the system dataset later, TrueNAS will migrate the existing data in the system dataset to the new location.

Storing the System Log

Users can store the system log on the system dataset. We recommend users store the log information on the system dataset when the system generates large amounts of data and has limited memory or a limited capacity operating system device.

Set Syslog to store the system log on the system dataset. Leave unset to store the system log in /var on the operating system device.