Re: Can't add disk to failed raid array

[Paul Waldo <pwaldo@waldoware.com>]

Thanks for the reply, Neil.  Here is my version:
[root@paul log]# mdadm --version
mdadm - v2.3.1 - 6 February 2006

This is a somewhat production system, running Fedora Core 5.  Official 
packages containing mdadm at version 2.5.2 aren't available (to my 
knowledge), and I am very hesitant to experiment with non-official 
software :-(

Would "mdadm --assemble" be of use to me here?  From the message "md: hdd2 has 
invalid sb, not importing!", it seems I need to get an "sb" (assumed to be 
super block) on that partition.  Would --assemble work and not destroy the 
existing good array?

As another data point, when I replaced the bad disk, I was able to 
add /dev/hdd1 to /dev/md0 with no problem.  md0 is a RAID 1 array and hdd1 
was a spare, so there may be no relation at all...

Thanks for your help!

On Sunday 16 July 2006 6:19 am, Neil Brown wrote:
> On Saturday July 15, pwaldo@waldoware.com wrote:
> > Hi all,
> >
> > I have a RAID6 array where a disk went bad.  I removed the old disk, put
> > in an identical one, and repartitioned the new disk.  I am now trying to
> > add the new partition to the array, but I get this error:
> >
> > [root@paul ~]# mdadm --add /dev/md1  /dev/hdd2
> > mdadm: add new device failed for /dev/hdd2 as 2: Invalid argument
> >
> > When I perform that command, /var/log/messages says this:
> > Jul 15 20:48:39 paul kernel: md: hdd2 has invalid sb, not importing!
> > Jul 15 20:48:39 paul kernel: md: md_import_device returned -22
>
> Rings a bell, but I cannot quite place it..
>
> What version of mdadm are you running?  If not 2.5.2, try that.
>
> ...
>
> >     Number   Major   Minor   RaidDevice State
> >        0       3        2        0      active sync   /dev/hda2
> >        1      22        2        1      active sync   /dev/hdc2
> >    3157553       0        0        5      removed
>
>      ^^^^^^^
> That looks very odd.  If 2.5.2 does that I'll have to look into why.
>
> NeilBrown
>
> >        3      33        2        3      active sync   /dev/hde2
> >        4      34        2        4      active sync   /dev/hdg2
> >        5       8        2        5      active sync   /dev/sda2
> >        6       8       18        6      active sync   /dev/sdb2
> >
> > [root@paul log]# uname -rv
> > 2.6.17-1.2139_FC5 #1 Fri Jun 23 12:40:16 EDT 2006
> > -
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