Re: RAID 1 always need to reconstruct

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On Sat, Mar 30, 2002 at 09:02:08PM +1100, Neil Brown wrote:
> On Friday March 29, brian@worldcontrol.com wrote:
> > On Thu, Mar 28, 2002 at 04:12:37PM -0800, brian@worldcontrol.com wrote:
> > > You can read all the gory details of my RAID1 setup at
> > >     http://www.litzinger.com/raid.html
> > > ...
> > > I created a bootable RAID 1 setup and everything works fine.
> > > 
> > > Except, every time I power down the system and bring it back
> > > up the system reports that the RAID array is unclean and
> > > spends and hour doing a reconstruct.
> > 
> > Responding to my own email, the message that flies by
> > is 'invalidate: busy buffer'.  There are generally
> > what looks to be between 3 and 30 of them.
> 
> These messages are normal if your root filesystem is on md/raid.
> As the root filesystems is never unmounted, there are still buffers
> active when the md devices finally gets turned off and invalidates all
> of its buffers.
> 
> It sounds like your machine is getting switched off too quickly after
> the raid shuts down and your IDE drives which has said that the data
> is safe, haven't actually had a chance to flush it out of cache yet.
> 
> Can you compile without APM support so that it doesn't actually power
> down itself?

I've recompiled the kernel without APM support.  I can reboot the
machine without problems.  However, I might always have been able to do
that.  I don't remember.  The machine is remote.  Next time I'm present
at the machine I'll give poweroff a try.

Thanks for the help,

-- 
Brian Litzinger <brian@worldcontrol.com>

    Copyright (c) 2002 By Brian Litzinger, All Rights Reserved
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