On 02/10/2014 11:48 AM, Justin Stephenson wrote:

Hello,

I have reviewed the Linux Raid Wiki regarding rebuilding and it
recommended writing a note to the list.

I am running an mdadm raid on CENTOS 6.5 with 6 disks in a Raid 6 off of
my motherboard's SATA controller.

I added a 7th disk as a spare.

When I rebooted the raid after adding the spare, it would not mount and
the OS would only boot into recovery mode. I changed my fsck file to
exclude the raid and can now boot into the GUI.

I have tried to reassemble the array using --assemble and I get the the
following message:

mdadm: we match both /dev/md/BigBlue:0 and /dev/md0 - cannot decide
which to use.

Please show the output of your mdadm.conf file, and the complete command
you used to assemble with.  Add "-v" to it to show more information.

{There's nothing wrong with your array, just conflicting info in your
configuration file.}

Phil