Date: Thu, 10 Aug 2006 19:27:38 -0400 From: "Sean Bryant" <bryants@gmail.com> To: "Pawel Jakub Dawidek" <pjd@freebsd.org> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org, freebsd-geom@freebsd.org Subject: Re: GJournal (hopefully) final patches. Message-ID: <f6791cc60608101627oa29acd1ge3f2de89660f0cf1@mail.gmail.com> In-Reply-To: <20060810232255.GE1389@garage.freebsd.pl> References: <20060808195202.GA1564@garage.freebsd.pl> <f6791cc60608101418r52c42aa0mad896951db5b75a@mail.gmail.com> <f6791cc60608101554w2b10d8a5y9dc87f2198080281@mail.gmail.com> <20060810232255.GE1389@garage.freebsd.pl>
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On 8/10/06, Pawel Jakub Dawidek <pjd@freebsd.org> wrote:
> On Thu, Aug 10, 2006 at 06:54:04PM -0400, Sean Bryant wrote:
> > On 8/10/06, Sean Bryant <bryants@gmail.com> wrote:
> > Alright. After testing I've found the problem. You can enable
> > journaling on an existing filesystem, provided the journaling provider
> > is not the data provider.
> >
> > I could not do the following:
> > tunefs -J enable ad4s1e
> > gjournal label ad4s1e
> > fsck_ffs -p ad4s1e
>
> Yes, maybe I wasn't clear on this. I think I described it only slightly
> in my first gjournal announce.
>
> GJournal is not file system journaling, it needs separate journal space.
> If you 'gjournal label' only one partition, it will put journal at the
> end on this partition and leave space for data at the begining of the
> partition.
>
> To convert existing file system to gjournal you have to:
> 1. Have separate partition for journal.
> 2. Confirm that partition with your file system is _not_ 4 sectors
> aligned. If it is not 4 sectors aligned, it is safe for gjournal to
> use its last sector for metadata. You can verify this by running:
>
> test `diskinfo /dev/<data_partition> | awk '{print $4}' | xargs -J X echo X % 4 | bc` -eq 0 && echo ok || echo not ok
>
> Then you need to run those commands:
>
> # gjournal label /dev/<data_partition> /dev/<journal_partition>
> # tunefs -n disable -J enable /dev/<data_partition>.journal
>
> --
> Pawel Jakub Dawidek http://www.wheel.pl
> pjd@FreeBSD.org http://www.FreeBSD.org
> FreeBSD committer Am I Evil? Yes, I Am!
>
>
>
Okay that clears it up a bit. I thought it would adjust the size
available or something. By putting the journal at the end.
Okay thanks :) But it works. and well.
--
Sean Bryant
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