Problems with dump and restore

[Warren Block]

On Tue, 12 Aug 2014, Roland Smith wrote:

> In 2011, a problem was found with snapshots in combination with soft
> updates *and* journaling (SU+J) hanging the machine. At that time the
> recommendation was to switch off journaling.
> According to https://wiki.freebsd.org/NewFAQs:
>
>    If you want to use snapshot (dump -L) then disable the soft updates
>    journal for that filesystem.
>
> This bug was fixed toward the end of 2011;
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=160662

The snapshot code still does not support snapshots of mounted SUJ 
filesystems: 
http://svnweb.freebsd.org/base/head/sys/ufs/ffs/ffs_snapshot.c?revision=262678&view=markup#l234