ZFS Scrub and ZFS Resilver
These are two documents that I have found that have a good deal of information on Scrub and Resilver process.
Understanding the ZFS Pool Scrub Operation, Tuning Scrub Performance, and Troubleshooting Scrub Issues (Doc ID 1496376.1)
Understanding the ZFS Pool Resilver Operation and Tuning Resilver Performance (Doc ID 1496593.1)
A command to monitor the resilver process:
# zpool monitor -t resilver