Re: MDADM after QNAP Support disaster QNAP 859 Pro

[NeilBrown <neilb@suse.de>]

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On Sat, 27 Oct 2012 17:26:42 +0200 Sam van Ratt <sam.vanratt@gmx.net> wrote:

> Hello
> a few days I received a NAS with 8 Slots. The original config consistet 
> of 8* 2TB HDs as a RAID6 mdadm softraid system. After a normal reboot 
> the array was no longer found, so QNAP was contacted.
> The support told the keyuser todo this:
> 
> 
> mdadm -D /dev/md0 (zeigt das gesamte RAID auf)
> to assemble the HDs you have to:
> mdadm -A /dev/md0 /dev/sda3.... (take care here, depending on the HDs 
> they get a value like /dev/sdb3 dev/sdc3 ...) - with 8 HDs:
> mdadm -A /dev/md0 /dev/sda3 /sdb3 /dev/sdc3 /dev/sdd3 /dev/sde3 
> /dev/sdf3 /dev/sdg3 /dev/sdh3 (be careful with the order!)
> If you get an error message about the assemble, you have to stop md0
> mdadm -S /dev/md0 (stopping md0)
> umount /dev/md0 (unmount of md0)
> 
> After serveral failed tries it endet in have a RAID 1 Konfig on sda and 
> sdb but not seeing anything else of the config before (funnily only a 
> 500MB partition (as /dev/md9 sounds as a lot of tries).
> As I'm not using mdadm in my workplace anywhere:
> 
> How can I delete the RAID1 (pretty simple I know) and reconstruct the R6 
> Array without damaging the config further (and therefore the datas). The 
> R6 should be about 11TiB usable size.
> Is there a init build with searching for the old conifg? As R6 it should 
> even be readable without sda or sdb if this should be needed. I manly 
> use HW RAID Controller where a few (ICP, Infortrend, Areca)  which 
> allows a reassembly by just declaring the disks as member to mdx and 
> assemble then again; I hope mdadm could offer something similar
> 

The advice you were given doesn't seem very helpful.

Please run

 mdadm --examine /dev/sd*

collect the output, and post it.

NeilBrown

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