Re: Invalidate: busy buffer + MD RAID 1

[Teodor Iacob <Teodor.Iacob@astral.kappa.ro>]

I get the same behaviour on several machines .. but I sleep well at night :P

On Wed, Dec 18, 2002 at 07:45:00PM +0100, Igmar Palsenberg wrote:
> 
> Hi,
> 
> I get a 'invalidate: busy buffer' about 20 times at reboot. Only at 
> reboot however.
> 
> Setup :
> 
> linux-2.4.19 + grsecurity-1.9.7d + acl+xattr 0.8.53 + freeswan (inc. aes 
> and that kind of stuff)
> 
> The machine (Compaq ML350) has 2 scsi devices (sda, sdb) and a RAID 1 
> setup :
> 
> md0 : sda1 + sdb1
> md1 : sda3 + sdb3
> swap is done on sda2 + sdb2, using default prio's.
> 
> Triggering the 'invalidate: busy buffer' is easiest done by letting squid 
> create it's cache dirs and then rebooting.
> 
> No data corruption is occuring (at last not any that a force fsck can 
> detect), but I removed the RAID1 setup to make sure I sleep well tonight 
> :)
> 
> Looking at the md.c code, line 1708 :
> 
>     ITERATE_RDEV(mddev,rdev,tmp) {
>         if (rdev->faulty)
>             continue;
>         invalidate_device(rdev->dev, 1);
>         if (get_hardsect_size(rdev->dev)
>             > md_hardsect_sizes[mdidx(mddev)])
>             md_hardsect_sizes[mdidx(mddev)] =
>                 get_hardsect_size(rdev->dev);
>     }
> 
> Looks like it is invalidating the underlying devices (sda[13], sdb[13] in 
> my case.
> 
> Since my RAID array doesn't get screwed I suspect that the md code does 
> the above again on a do_md_stop(), but I can't find it.
> 
> Anyone got any comments on this ?? 
> 
> 
> 
> 	Regards,
> 
> 
> 		Igmar
> 
> 
> Please CC all responses.
> 
> 
> 
> -- 
> 
> Igmar Palsenberg
> JDI Media Solutions
> 
> Helhoek 30
> 6923PE Groessen
> Tel: +31 (0)316 - 596695
> Fax: +31 (0)316 - 596699
> The Netherlands
> 
> mailto: i.palsenberg@jdimedia.nl
> PGP/GPG key : http://www.jdimedia.nl/formulier/pgp/igmar
> 
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-- 
      Teodor Iacob,
Network Administrator
Astral TELECOM Internet