Support for multiple logical devices on single physical

Heinz Mauelshagen mauelshagen at
Thu Mar 27 11:41:40 UTC 2008


the promise metadata format handler in dmraid doesn't support multiple
RAID sets on the same RAID devices.  I don't have evidence so far, that
there's a Promise extension supporting such.

Please send me your metadata created with "dmraid -rD" (i.e. files
*.{dat,offset,size}) tar'ed/bzip2'ed in pdc-Chris_Adams-multi.tar.bz2
and I'll see if it's possible to add multi set support for pdc to dmraid.


On Tue, Mar 25, 2008 at 03:00:30PM -0500, Chris Adams wrote:
> I have an ATI SB600 based board with a couple of SATA drives attached.
> They are different sizes (300G and 320G), so there are two logical
> drives defined: a RAID1 mirror of the first 300G of both drives and a
> "RAID0" of the remaining 20G of the second drive.  However, it looks
> like dmraid only sees the first logical drive (so I can't use the
> remaining 20G of the second for scratch space).
> It appears the system is using Promise-style setup (device is
> pdc_bacdae).
> How can I use the 20G second logical drive?
> -- 
> Chris Adams <cmadams at>
> Systems and Network Administrator - HiWAAY Internet Services
> I don't speak for anybody but myself - that's enough trouble.
> _______________________________________________
> Ataraid-list mailing list
> Ataraid-list at


Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
Storage Development                               56242 Marienrachdorf
Mauelshagen at                            PHONE +49  171 7803392
                                                  FAX   +49 2626 924446

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