Re: recovery not starting: wrong superblock? multipath instead of raid1 !? (long!)

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On Tuesday September 9, r.ems@gmx.net wrote:
> 
> /proc/mdstat and mdadm --examine show that /dev/hdb2 is active, so I 
> tried setting /dev/hda2 to faulty, remove it and add it back again, but 
> no recovery was started.

I suggest you try to boot with hda2 not in the array at all.  Just
hdb2.
Probably this means usinf fdisk to tell hda2 that it isn't a raid
device so it doesn't get auto-detected.
Then When you have a raid1 array working off just hdb2, hot add hda2.
Then set the partition type back, and reboot.
> 
> Why does it show "Raid Level : multipath" ???

Weird.  No idea.  But it is getting it from hda2 which is why I say
start the array without that.
> 
> What are "Raid Devices"? The ones defined in /etc/raidtab?
Yes, the number of devices in a fully working array.


> Why "Total Devices : 1"? Is this the same as "Working Devices"?

No.  It includes spares.  hdb2 thinks there is only 1 device of any
sort at the moment.

> Could devices be working but not active?

Yes.  A hot spare is working but not active.

NeilBrown
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