So, I bought a new hard disk for my server recently. The intention was to expand the size of one of the zpools that is used for local backup replicas. It should have been an easy job, but easy jobs always have a way of going wrong…
I’d followed the same process that I had followed several times before, put the new drive in a spare bay, run the various tools you can to zero the drive out, write random data across it, zero it out again and so on. Everything was fine, no issues showing up, no performance anomalies to investigate. So I pushed the button to start the replacement in ZFS of the old drive with the newer larger one. Everything was still fine, the data all copied across, no downtime, no issues, zfs pool expanded, green lights across the board.
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