[CentOS] Problems with RAID0 array on new server

Michael Slater

slaterm at theiguru.net
Sat Apr 28 13:48:18 UTC 2007


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


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