dmraid questions

Heinz Mauelshagen mauelshagen at
Sat Jul 10 00:44:34 UTC 2004

On Fri, Jul 09, 2004 at 10:55:50AM -0400, René-Pierre Lehmann wrote:
> I tried the dmraid tool from
> I have a hpt370 chipset and a two disk array in raid 0 (striping).
> the outpout from dmraid -r is
> /dev/hdg: hpt37x_eaaajjcij, "hpt37x", striped, 156355456 sectors, data@ 10
> /dev/hde: hpt37x_eaaajjcij, "hpt37x", striped, 156355456 sectors, data@ 10
> I end up with a /dev/mapper/hpt37x_eaaajjcij file.

Hi René-Pierre.

> * What does the sequence 'eaaajjcij' mean ?

In order to uniquely distinguish one array from another, dmraid needs
to generate unique device names.

For Highpoint 37x series, it is derived from the magic_0 number and, in case
of RAID10, the magic_1 number as well which are part of the Highpoint ondisk
metadata. The generated string gets prefixed with "hpt37x_".

> * I have two ext3 partitions on that array, how can I access them now ?

You should have /dev/mapper/hpt37x_eaaajjcij_pX devnodes where X is
the respective number of your partition unless you activated with option -p.
Try "ls /dev/mapper/hpt*" or "dmsetup ls|grep '^hpt'" to list them.

BTW: you might consider to generate convenience symlinks
     to your Highpoint devnodes.

> -- 
> Rene
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Heinz    -- The LVM Guy --


Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
                                                  56242 Marienrachdorf
Mauelshagen at                            +49 2626 141200
                                                       FAX 924446

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