This page describes the feature available with version 11 of the ZFS on-disk format. This version includes support for the following feature:
Improved zpool scrub / resilver performance
This feature is available in:
Solaris Express Community Edition, build 94
The related bug for the version 11 change is:
6343667 scrub/resilver has to start over when a snapshot is taken
(Note, this bug is fixed when using build 94 even with older pool versions. However, upgrading the pool can improve scrub performance when there are many filesystems, snapshots, and clones.)