Mailinglist Archive: opensuse (1213 mails)

[Jim Cunning <jcunning@xxxxxxxxxxxxxxx>]

On 04/15/2012 11:26 PM, Per Jessen wrote:
> Felix Miata wrote:
>
> > I've since replaced the 250G with a 500G, succeeded in replacing the
> > individual RAID elements on md0-md6, and want to create a clone of the
> > 152G partition on the 320G disk on the 500G disk, then create md7 from
> > those two partitions.
> >
> > I tried initially creating md7 using only the original 152G partition
> > to ensure against data loss, then add the new 152G partition to the
> > existing single partition md7. 
> Sounds good.
>
> > These mdX partitions are all type 0xFD in the partition tables.
> > But 'mdadm -cv/dev/md7 --level=1 /dev/sdb14' produces an error
> > message "mdadm: -c does not set the mode, and so 
> > cannot be the first option". So, I don't know what to do. If there's
> > anything in the mdadm man page on converting existing partitions to
> > RAID1 elements, I'm missing it.
> Shouldn't  your command be:
>
> mdadm --create /dev/md7 --level=1 -n1 /dev/sdb14
This might be better:

    mdadm --create /dev/md7 --level=1 -n2 /dev/sdb14 missing

> From the man page:

>        To create a "degraded" array in which some devices are
> missing,  simply
>        give  the  word  "missing"  in place of a device name.  This
> will cause
>        mdadm to leave the corresponding slot in the array empty.  For
> a  RAID4
>        or  RAID5 array at most one slot can be "missing"; for a RAID6
> array at
>        most two slots.  For a RAID1 array, only one real device 
> needs  to  be
>        given.  All of the others can be "missing".
Jim

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