[CentOS] mdadm syntax

Art Baldini rootajb at gmail.com
Sun Nov 4 22:25:32 UTC 2007


After some testing the placement of the -a was important.  when I put it
after /dev/md12, similar to what Tim posted worked.

Thanks...Art

On 11/2/07, James Olin Oden <james.oden at gmail.com> wrote:
>
> On 11/2/07, Tim Verhoeven <tim.verhoeven.be at gmail.com> wrote:
> > On Nov 2, 2007 8:14 PM, Art Baldini <rootajb at gmail.com> wrote:
> > > Hi All,
> > >     I am trying to create an MD device.  I am using the command:
> > > /sbin/mdadm --create --a /dev/md12 --level=1 --run --raid-devices=2
> > > /dev/sda12 /dev/sdb12
> > > to create the device, and to dynamically create the device file if
> needed.
> > > What I want is the device file to be created as /dev/md12, but with
> the -a
> > > flag it creates it as /dev/md<first unwsed minor number>.
> > >
> > > I have tried various options to the -a or --auto, but cannot seem to
> find
> > > the correct syntax.  From the man page it says:
> > >        -a, --auto{=no,yes,md,mdp,part,p}{NN}
> > >               Instruct mdadm to create the device file if needed, and
> to
> > > allocate an unused
> > >               minor number.  "yes" or "md" causes a
> non-partitionable  array
> > > to  be  used.
> > >               "mdp", "part" or "p" causes a partitionable array (2.6and
> > > later) to be used.
> > >               The argumentment can also come immediately after "-a".
> e.g.
> > > "-ap".
> > >
> > > Am I doing something wrong, or is there no way to get mdadm to
> automatically
> > > create a specific device file.
> >
> > I've done it like this :
> >
> > mdadm --create /dev/md12 --auto=yes --level=1 --run --raid-devices=2
> /dev/...
> >
> The only difference is that he is doing -a rather than --auto=yes.  I
> get the same result as Art is getting when I do it your way.   You can
> still access it as /dev/md12, but it shows up in /proc/mdstat as
> /dev/md0 (which is, well, weird).
>
> Cheers...james
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