I tried the patch and immediately found problems.
On creation of raid1 array, only the spare has md superblock, the raid
disks has no superblock. For instance:
mdadm -C /dev/md0 -l 1 -n 2 /dev/hdd1 /dev/hdd2 -x 1 /dev/hdd3
[wait for resync to finish if you want to...]
mdadm --stop /dev/md0
mdadm --examine /dev/hdd1 (no super block found)
mdadm --examine /dev/hdd2 (no super block found)
mdadm --examine /dev/hdd3 (nice output)
If you want to skip spares, you will need to alter the patch (see below)
On Wed, 2005-03-09 at 14:05, Peter Evertz wrote:
> Mike Tran writes:
>
> > Hi Peter,
> >
> > After applying this patch, have you tried stop and restart the MD
> > array? I believe the spares will be kicked out in analyze_sbs()
> > function (see the second ITERATE_RDEV)
> mdadm ( v1.6.0 - 4 June 2004 )
> shows the arrays complete including spare.
> /proc/mdstat is ok
>
> I booted with my patched raid modules. So analyze_sbs() should have run.
> Maybe it works only for 0.90 superblocks, I haven't tried 1.00
>
> No problems yet. If it really fails the hard way, I will go to the next
> Internetcafe and tell you about it :)
>
> Peter
> >
> > --
> > Regards,
> > Mike T.
> >
> >
> > On Wed, 2005-03-09 at 09:53, Peter Evertz wrote:
> >> This patch removes my problem. I hope it doesn't have influence on the
> >> stability of
> >> the system.
> >> It is simple: The Update routine skips normaly only "faulty" disks. Now it
> >> skips all disk
> >> that are not part of the working array ( raid_disk == -1 )
> >> I made some testing, but surely not all, so :
> >>
> >> DON'T APPLY TO YOUR SYSTEM WITH IMPORTENT DATA !
> >>
> >> Regards
> >> Peter
> >>
> >> --- md.c.orig 2005-01-14 16:33:49.000000000 +0100
> >> +++ md.c 2005-03-09 15:27:23.000000000 +0100
> >> @@ -1340,14 +1340,14 @@
> >> ITERATE_RDEV(mddev,rdev,tmp) {
> >> char b[BDEVNAME_SIZE];
> >> dprintk(KERN_INFO "md: ");
> >> - if (rdev->faulty)
> >> - dprintk("(skipping faulty ");
> >> + if (rdev->faulty || rdev->raid_disk < 0)
> >> + dprintk("(skipping faulty/spare ");
> >>
> >> dprintk("%s ", bdevname(rdev->bdev,b));
> >> - if (!rdev->faulty) {
> >> + if (!rdev->faulty && !rdev->raid_disk <0 ) {
if (!rdev->faulty && rdev->in_sync)
err += write_disk_sb(rdev);
else {
if (rdev->faulty)
dprintk(" faulty.\n");
else
dprintk(" spare.\n");
}
/*
* Don't try this :(
* because this still breaks creation of new md array and..
* for existing arrays with spares, the spares will be kicked out when
* the arrays are re-assembled.
*/
--
Regards,
Mike T.
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