> and having to reread everything—as a rebuild does—is a rather abnormal load. Far from being an abnormal load, it should be a cron job. Backups need to be ver

> and having to reread everything—as a rebuild does—is a rather abnormal load. Far from being an abnormal load, it should be a cron job. Backups need to be verified. Data at rest needs to be periodically checked for bitrot. Reading everything on the array and verifying parity and any checksums is important preventive maintenance and an early warning system.