Re: [gentoo-user] mdadm fails to add drive to arry

[Richard Fish]

On 9/1/06, Richard Broersma Jr <rabroersma@×××××.com> wrote:
> I recently had a drive failure in with a Raid 1 setup.  However, for testing purposes I tried to
> re-add the drive to the array after I removed it.  However I ran into the following error message.
>
> ~ # mdadm /dev/md4 --add /dev/hdj1
> mdadm: add new device failed for /dev/hdj1 as 2: Invalid argument
>
> Where is the invalid argument?  Or is this error message you get when it is time to buy a new hard

I think you forgot to specify the mode.  From man mdadm:

"""
SYNOPSIS
       mdadm [mode] <raiddevice> [options] <component-devices>
"""

and

"""
      If  a  device  is  given  before any options, or if the first option is
       --add, --fail, or --remove, then the MANAGE mode is  assume.   Anything
       other than these will CAUSE THE MISC MODE TO BE ASSUMED.
"""
(emphasis added)

So I think you need "mdadm manage /dev/md4 --add /dev/hdj1".  Or
"mdadm --add /dev/md4 /dev/hdj1".

This isn't based on an actual test, just reading the documentation, so I HTH.

-Richard
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