Dump an Unmounted Journaled UFS Filesystem

[Warren Block]

On Wed, 2 Jul 2014, Brandon Allbery wrote:

> On Wed, Jul 2, 2014 at 10:14 AM, Warren Block <wblock at wonkity.com> wrote:
>
>> On Tue, 1 Jul 2014, Dan Plassche wrote:
>>
>>  I understand that using dump is not currently recommended on a mounted
>>> journaled UFS2 filesystem.  I prefer to boot from a separate FreeBSD drive
>>> for cold backups anyway, so I'm wondering if there are any issues with
>>> running dump on an unmounted journaled filesystem?  All the discussions
>>> I've seen seem to focus on disabling journaling completely, which I would
>>> like to avoid.
>>>
>>
>> The snapshot code in sys/ufs/ffs/ffs_snapshot.c still prevents making
>> snapshots on SUJ filesystems.
>>
>>
> What exactly is the point of a snapshot for an *unmounted* ("running dump
> on an unmounted journaled filesystem", from above quoted text) filesystem?

There isn't a reason to snapshot an unmounted filesystem, just trying to 
be complete.