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Contact an Enterprise SpecialistTrueNAS CORE Version Documentation
This content follows the TrueNAS CORE 13.0 releases. Use the Product and Version selectors above to view content specific to different TrueNAS software or major version.
Mirroring the Boot Pool
2 minute read.
Adding a second storage device to the boot pool changes the configuration to a Mirror. This allows one of the devices to fail and the system still boots. If one of the two devices were to fail, that device is easily detached and replaced.
When adding a second device to create a mirrored boot pool, consider these caveats:
Capacity: The new device must have at least the same capacity as the existing device. Larger capacity devices can be added, but the mirror will only have the capacity of the smallest device. Different models of devices which advertise the same nominal size are not necessarily the same actual size. For this reason, adding another device of the same model of is recommended.
Device Type: We strongly recommend using SSDs rather than USB devices when creating a mirrored boot pool.
Removing devices from storage pools can result in data loss!
Go to System > Boot > ACTIONS > Boot Pool Status.
Click on the boot device, then click attach.
Select a new Member Disk from the drop-down and click SUBMIT.