Bug#705454: mdadm: --examine --scan generates wrong #spares

[Thorsten Glaser]

On Mon, 6 May 2013, NeilBrown wrote:

> It appears that your '2' partitions are at an offset of a multiple of 64K

Well of course they are ☺

> Both sda and sda2 look like they have the same superblock, because the
> superblock is at the "end" of both.  This can seriously confuse mdadm.  It
> would probably refuse to assemble the array unless you have a DEVICES line in
> mdadm to tell it to ignore 'sda' etc.

.oO(eh?)

> If possible, I would suggest recreating the md1 array using 1.2 metadata.

But I specifically made it to use 0.90 metadata and the FDh
partition type so that Linux will auto-assemble them so that
I can boot from them. The mdadm docs say 1.x will not be
auto-assembled.

I can’t recreate md1 on any of the affected devices (five by
now) even should my above concern about booting be a non-issue…

bye,
//mirabilos
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