In the event that a disk needs to be replaced, but it has not been faulted at the zpool level, if a spare drive is available, you can simply remove the drive and make sure that the replacement takes place by checking 'zpool status' from a shell.
The drive does not need to be logically removed before physically replacing it.
If the replacement drive needs to be put in place after removing the bad drive, then put the replacement drive in and add the new drive as a spare in the Web UI by right-clicking the pool and selecting "Recover Storage Pool / Add Spares..." and selecting the newly-added drive.
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