Fasttrack TX2 - Raid10, dmsetup table example?

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You have two full RAID0 arrays now. hda/hdb is one stripe, hdc/hdd is the
other. You could also use hda/hdd or hdc/hdb, though, since the two stripes
are identical.

This probably doesn't help you get your array recognized by dmraid, but you
should be able to plug either half into just about any Promise raid
controller and have it be recognized as a degraded array. Rebuilding on that
should convert it from a degraded RAID10 to a functional RAID0, with no loss
of data. You will also have another untouched degraded array half with all
the data, just in case.

This is probably all stuff you already knew, but I hope something in here is
helpful.


Message: 3
> Date: Sat, 09 Dec 2006 11:24:19 +0100
> From: Torsten Krah <tkrah at fachschaft.imn.htwk-leipzig.de>
> Subject: Fasttrack TX2 - Raid10, dmsetup table example?
> To: ataraid-list at redhat.com
> Message-ID: <457A8ED3.4090709 at fachschaft.imn.htwk-leipzig.de>
> Content-Type: text/plain; charset=ISO-8859-15; format=flowed
>
> Hello.
>
> Got a raid10 array on a pdc20270 controller, fasttrack100 tx2.
> Some loss of power made some serious damage to the complete pc.
> The disks however are still working - the controller is a little bit
> broken - no boot message about the raid things, only ide does still
> work, more or less ( dma errors etc. pp ).
>
> So i took the drives and put in on a normal ide controller - they are
> all recognized.
> running dmraid on a 2.6.17 kernel, ubuntu edgy, does found nothing.
>
> Drives are found as follows:
>
> hda, hda1
> hdb - unknown partition table
> hdc, hdc1
> hdd - unknown partition table
>
> I know there was a 10 setup prior on these 4 disks - although i don't
> know how the pdc controller does the mapping on 4 drives.
>
> Is it possible to create the mappings for a raid10 again - to get the
> only partition on those drives back?
> Anyone a example, found many for raid0 or raid1, but nothing for 10 - i
> don't want to do some damage to the raid ( i hope its still there ... ),
> so i'll asking before.
>
> thx for any help.
>
> kind regards
>
> Torsten
>
>
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