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How can I shrink a ZFS pool to replace an SSD with a slightly smaller one?

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I have a RAIDZ cache pool consisting of three 1TB (1024209543168 bytes) SSDs. One drive needs to be replaced. I have another SSD that is also declared as 1TB, but only contains 1000204886016 bytes.

Is it possible to shrink the existing ZFS partitions (or the pool?) so that the smaller drive is accepted by unRAID in the pool?

Or should I move the pool's data into the array to destroy the pool and then create a new pool with the three dissimilar drives?

Thanks in advance for any advice.

Solved by JorgeB

  • Community Expert
  • Solution
22 minutes ago, kardinal said:

Is it possible to shrink the existing ZFS partitions (or the pool?) so that the smaller drive is accepted by unRAID in the pool?

I'm afraid ZFS doesn't allow that; you would need to backup and recreate the pool.

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