Troubleshooting ZFS: From Checksum Errors to Key Re-Parenting

This article serves as a troubleshooting guide for ZFS, covering common issues such as checksum errors, disk failures, snapshot recovery, and encrypted dataset manipulation. It details how to use `zpool status`, `smartctl`, and `zfs scrub` to detect and repair checksum errors; `zpool offline` and `zpool replace` to replace failed disks; `zfs rollback`, `cp`, and `zfs clone` for data recovery; and `zfs change-key` to change encryption keys, including explanations of encrypted dataset replication and key re-parenting. This guide empowers users to better understand and handle common ZFS problems, ensuring data safety and system stability.