In-place replacement of Mirror Pair

TrueNAS General
1

I currently have a MIRROR pair consisting of 2x12TB disks. I’d like to upgrade this mirror with 2x20TB disks I have.

I’m assuming the process would involve something like this:

  1. “Detach” one 12TB disk
  2. Swap in one 20TB disk in its place
  3. Wait for the Mirror to re-populate on the new disk
  4. Repeat for the other disk

This is the first time I’ll be doing anything like this so I just wanted to check with the more experienced users out there for more exact steps of this process.

Thanks!

2

The process you describe will work, though you’ll be missing some redundancy while you’re resilvering. You can also, if you have enough drive bays and SATA ports, attach the two new drives, replace both old drives simultaneously using the GUI, and then remove the two old drives. This maintains redundancy throughout, at the expense of taking more system resources during the replacement.

Either way, since iX screwed the pooch with pool auto-expansion in SCALE/CE, you’ll need to click the “expand pool” button in the UI once the disk replacement is complete.

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3

Unfortunately, all the bays on my NAS are full, so I need to do the swaps in-place. Not sure about the “expand pool” comment. Do you mean after I swap in the first new 20TB drive I’ll need to “expand pool” to it to get the data to copy over from the remaining original pair drive? And then again when the 2nd new drive is in?

4

No.

  • Power down system
  • Remove one 12 TB drive, replace with 20 TB drive, power up
  • In the GUI, replace the drive. Wait for this to finish.
  • Repeat above steps with the second 20 TB drive.
  • Once that finishes, in the GUI, “Expand Pool” to take advantage of the larger drives.
2 Likes
5

Perfect. That’s just what I needed.

Thanks