Replacing Failed Disks

This process is for a failed disk. For replacing a disk that has not failed see here Replacing a Drive Prior to Failure 

 Replacing a Disk 

 Another disk of the same or greater capacity is required to replace a failed disk. This disk must be installed in the TrueNAS system, not part of an existing storage pool, and available to use as a replacement. The replacement process wipes any data on the replacement disk. 

 

 

 Can I replace a disk in a GELI-encrypted (Legacy) pool? 

   

 

 The TrueNAS  Pool  widget on the main  Dashboard  shows when a disk failure degrades a pool. 

 

 

 Figure 1: Degraded pool on dashboard widget 

 

 

 Click the  settings  on the pool card to go to the  Storage > Pools > Pool Status  screen to locate the failed disk. 

 To replace a disk: 

 

 Take the disk offline. 

 Remove, or replace the disk. 

 Refresh the screen. 

 Bring the disk online. 

 

 Taking a Failed Disk Offline 

 Clicking  more_vert  for the failed disk to show the disk options. 

 

 

 Figure 2: Pool Status disk options 

 

 

 We recommend you take the disk offline before starting the replacement. This removes the device from the pool and can prevent swap issues. To offline a disk: 

 Go to  Storage > Pools  screen, click on the  settings  settings icon, and then select  Status  to Open the  Pool Status  screen and display the disks in the pools. 

 Click the  more_vert  icon for the disk you plan to remove, and then click  Offline . 

 Select  Confirm , then click  OFFLINE . The disk should now be offline. 

 

 

 Can I use a disk that is failing but still active? 

   

 

 

 

 The offline failed? 

   

 

 When the disk status shows as  Offline , physically remove the disk from the system. 

 

 

 Figure 3: Pool Status disk offline 

 

 

 Replacing a Disk 

 If the replacement disk is not already physically added to the system, add it now. 

 If replacing a failed disk with an available disk in the system, click  Replace , select an available disk from the dropdown list, then click  Replace . 

 To update the  Pool Status  screen and show the new disk, click  Refresh . 

 In the  Pool Status , open the options for the offline disk and click  Replace 

 

 

 Figure 4: Replacing disk screen 

 

 

 Select a new member disk and click  Replace Disk . The new disk must have the same or greater capacity as the disk you are replacing. The replacement fails when the chosen disk has partitions or data present. To destroy any data on the replacement disk and allow the replacement to continue, set the  Force  option. 

 When the disk wipe completes and TrueNAS starts replacing the failed disk, the  Pool Status  changes to show the in-progress replacement. 

 

 

 Figure 5: Pool Status replacing disk 

 

 

 TrueNAS resilvers the pool during the replacement process. For pools with large amounts of data, resilvering can take a long time. 

 Bringing a New Disk Online 

 When the resilver completes, the pool status screen updates to show the new disk, and the pool status returns to  Online . 

 

 

 Figure 6: Pool Status disk replacement complete 

 

 

 During the failed disk replacement process, take these actions after removing and replacing the physical disk to make that replacement disk available: 

 

 Go to  Disks  and locate the offline disk 

 Click the  more_vert  icon for the offline disk 

 Click  Online .