fsck errors on a running system that disappear in single-user mode

[Anthony Atkielski]

Kris Kennaway writes:

> Yes (single-user mode isn't the issue; the filesystem needs to be
> unmounted or mounted read-only, or to be using UFS snapshots (in 5.x)
> in order for fsck to have a consistent snapshot of the data that
> doesn't change out from underneath it).

Are UFS snapshots enabled by default on 5.x?  Is this related to the
snapshots taken during dump operations with the L option, or is it
different?

-- 
Anthony