[CentOS] Problems with RAID0 array on new server

[Johnny Hughes]

On Sat, 2007-04-28 at 21:48 +0800, Michael Slater wrote:
> Hello,
>   i recently installed Centos 5 on a new server with a single scsii  
> disk. After the installation, i added 2 additional disks that were  
> once the components of a raid0 array on another server.
> 
> I get some errors and am unable to start the array
> 
> the following is an extract from dmesg output:
> 
> md: Autodetecting RAID arrays.
> md: could not open unknown-block(8,17).
> md: could not open unknown-block(8,33).
> 
> i then examined each disk in fdisk
> 
> 
>     Device Boot      Start         End      Blocks   Id  System
> /dev/sdb1               1       17501    17921008   fd  Linux raid autodetect
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sdc1               1       17501    17921008   fd  Linux raid autodetect
> 
> I tried to re-create the array and get this:
> mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/sdb1  
> /dev/sdc1
> mdadm: chunk size defaults to 64K
> mdadm: Cannot open /dev/sdb1: No such device or address
> mdadm: Cannot open /dev/sdc1: No such device or address
> mdadm: create aborted
> 
> yet obviously the devices are there.
> what else should i look at.
> 
> putting the drives back in the old server, and the array comes up with  
> all data intact.
> 
> Any ideas ?
> 
> thanks,
> Michael

Are you trying to keep the data intact and move it that way to the new server ... or do you want to erase it all and just reuse the drives?
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