Should Disk sdb replaced or not?

[etorix]

Follow the chart if you want the details:

Drive Troubleshooting Flowchart

Do You Think You Have A Drive Issue? Use the flowcharts here to help you diagnose your problem. You will have a definitive answer much sooner than asking for help and waiting on a reply, followed by asking questions for more data, running tests, etc. Save yourself some time and learn a little bit in the process of using these flowcharts. These are very simple to follow flowcharts to diagnose drive problems/failures. There is a small bit about ZFS problems as many people will say it must be …

But the short answer is that the drive that was /dev/sdb when the alerts arised is not healthy.