UFS2 and Journaling in 9.1-RC3

[Ivan Voras]

On 07/12/2012 14:52, CeDeROM wrote:
> On Fri, Dec 7, 2012 at 2:41 PM, Ivan Voras <ivoras at freebsd.org> wrote:
>> It looks like you are confusing GEOM journalling (-J) and UFS-SU
>> journalling (-j). They are very different, and today you probably want
>> to use the latter. If you are installing 9.x from scratch, it will be
>> enabled by default. If not, you can use newfs -j or tunefs -j to enable it.
> 
> Hello Ivan! Thanks for the hint! :-) :-)
> 
> When I have created a new filesystem type 2 (UFS2) with -J switch,
> then on mount I get this error that filesystem has journaling enabled
> but no provider is specified, so it looks like no journal is enabled?

Yes.

> Does newfs -J create journal as well?

No.

> According to man newfs:
> 
>      -J      Enable journaling on the new file system via gjournal.  See
>              gjournal(8) for details.
> 
> This is why I have started reading man gjournal and saw an example
> where journal is first created before newfs...
> 
> Will "gjournal label -f" erase all data on partition with existing newfs/ufs2?

Very probably, depending how you use it.

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