Re: GJournal (hopefully) final patches.

On 8/10/06, Pawel Jakub Dawidek <pjd_at_freebsd.org> wrote:
> On Thu, Aug 10, 2006 at 06:54:04PM -0400, Sean Bryant wrote:
> > On 8/10/06, Sean Bryant <bryants_at_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_at_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