Re: [mdadm git pull] imsm fixes and general external metadata updates

[Doug Ledford <dledford@redhat.com>]

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On Mon, 2009-02-23 at 11:58 -0700, Dan Williams wrote:
> On Mon, Feb 23, 2009 at 8:54 AM, Doug Ledford <dledford@redhat.com> wrote:
> > On Mon, 2009-02-02 at 10:46 +1100, Neil Brown wrote:
> >> We really need a man page for mdmon don't we.  Then this sort of text
> >> could be placed there for safely.
> >
> > Yes, a man page is definitely needed.
> 
> I have one brewing, I'll include it in an upcoming pull request.
> 
> > I have no intention of putting
> > mdmon in the initramfs.  The only arrays that should be started during
> > initramfs operation are / and possibly /boot.  Both of those are started
> > readonly.  It isn't until later in the boot process (in rc.sysinit on
> > Fedora/RHEL) that we remount the / device rw.  It's my intention to
> > modify our rc.sysinit so that before the root device goes rw, we start
> > the necessary mdmon instances.  This should be sufficient to keep the
> > container metadata state consistent with reality and avoids having to
> > add mdmon to the initramfs.  However, that means I need to know how to
> > invoke mdmon when mdadm isn't starting it for me.
> 
> Did you happen to catch the discussion on the initramfs mailing list
> [1]?  It would be nice to not need mdmon in the initramfs.  However, I
> have found it needs to be there because even read-only mounted
> filesystems require write access to the underlying block device to
> recover the journal.
> 
> --
> Dan
> 
> [1] http://thread.gmane.org/gmane.linux.kernel.initramfs/65/

Is XFS the only one that does the journal recovery on initial mount
read-only during the initfs step, or do other journaled fses do the same
thing?  I didn't think ext3 recovered the journal until you switch to a
read-write mount, but I guess I could be wrong.

-- 
Doug Ledford <dledford@redhat.com>
              GPG KeyID: CFBFF194
              http://people.redhat.com/dledford

Infiniband specific RPMs available at
              http://people.redhat.com/dledford/Infiniband


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