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Date:      Fri, 07 Dec 2012 14:54:35 +0100
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-current@freebsd.org
Subject:   Re: UFS2 and Journaling in 9.1-RC3
Message-ID:  <k9ssep$d1m$1@ger.gmane.org>
In-Reply-To: <CAFYkXjmT3x5U8sd1AJK6VxUAEdpcaMjDzyL5takKkNg7S2mY6Q@mail.gmail.com>
References:  <CAFYkXj=iv_MWhLC5YTfXGZA7RdLt3iEEjT_sDfPETCDf%2BK-KaQ@mail.gmail.com> <k9srm6$56d$1@ger.gmane.org> <CAFYkXjmT3x5U8sd1AJK6VxUAEdpcaMjDzyL5takKkNg7S2mY6Q@mail.gmail.com>

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On 07/12/2012 14:52, CeDeROM wrote:
> On Fri, Dec 7, 2012 at 2:41 PM, Ivan Voras <ivoras@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 enabl=
e it.
>=20
> Hello Ivan! Thanks for the hint! :-) :-)
>=20
> 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:
>=20
>      -J      Enable journaling on the new file system via gjournal.  Se=
e
>              gjournal(8) for details.
>=20
> This is why I have started reading man gjournal and saw an example
> where journal is first created before newfs...
>=20
> Will "gjournal label -f" erase all data on partition with existing newf=
s/ufs2?

Very probably, depending how you use it.


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