RAID0 problem array broken

[Ruben de Groot]

On Fri, Dec 17, 2004 at 01:20:42PM +0100, Karsten Fuhrmann typed:
> Hello,
> tonight my RAID0 configuration broke.
> It seems to be only a loose cable or power cord, which i fixed already.
> 
> But now my ar0 stripe will not be recognised anymore.
> /var/log/messages showed this :
> Dec 17 03:24:44 darkstar kernel: ad6: FAILURE - ATA_IDENTIFY timed out
> Dec 17 03:24:49 darkstar kernel: ad6: FAILURE - ATA_IDENTIFY timed out
> Dec 17 03:24:49 darkstar kernel: ad6: deleted from ar0 disk1
> Dec 17 03:24:49 darkstar kernel: ar0: ERROR - array broken
> Dec 17 03:24:49 darkstar kernel: ad6: WARNING - removed from configuration
> Dec 17 03:24:49 darkstar kernel: ar0: ERROR - array broken
> 
> And "atacontrol list" even shows all disks, here the output
> ATA channel 2:
>    Master:  ad4 <ST3200822AS/3.01> Serial ATA v1.0
>    Slave:       no device present
> ATA channel 3:
>    Master:  ad6 <ST3200822AS/3.01> Serial ATA v1.0
>    Slave:       no device present
> ATA channel 4:
>    Master:  ad8 <WDC WD2000JD-00HBB0/08.02D08> Serial ATA v1.0
>    Slave:       no device present
> 
> These 3 Disks are my stripe set!
> 
> Is there a way to recreate the stripe set without losing the data on the 
> disks?

Well, technically, since your data are indeed still there, you should be 
able to extract it from the disks. That would involve a small amount of
math though (stripe size e.a.).  

> I think there must be an easy way, because e.g. ill take these disks to 
> a friends computer(with the same controller) it should be possible to 
> use my raid on his machine, right?
> 
> I am running 5.3-RELEASE with a Promise TX 4

I'm not sure about the TX4; but what about recreating the array in the 
controller's BIOS (if it has one) without rebuilding the array?

Ruben