[CentOS] partition woes (mapper/isw_bdihgcgahe_Volume0p2)

Sat Apr 3 06:14:27 UTC 2010
Mark Pryor <tlviewer at yahoo.com>

--- On Fri, 4/2/10, aurfalien at gmail.com <aurfalien at gmail.com> wrote:

> From: aurfalien at gmail.com <aurfalien at gmail.com>
> Subject: [CentOS] partition woes (mapper/isw_bdihgcgahe_Volume0p2)
> To: "CentOS mailing list" <centos at centos.org>
> Date: Friday, April 2, 2010, 8:03 PM
> Hi,
> I found 2 identical drives lying around and put them into a
> system.
> When booting from a Centos 5.x installer, and when being
> presented  
> with the formatting option (disk druid), it says I have 1
> volume of;
> mamapper/isw_bdihgcgahe_Volume0p2
> I can't seem to get rid of it.  I have 2 physical
> disks but disk druid  
> is seeing 1 volume thats the same size as one of the 2
> identical drives.
> I've tried everything from yanking the 2nd drive,
> installing Centos  
> with 1 drive, then installing the second drive and doing;
> dd if=/dev/zero of=/dev/sdb
> ... to even installing diff OS's like Ubuntu and Windows
> which see 2  
> individual disks where I repartition/reformat the drives.
> Seems as though I can't truly re write a part of the master
> boot  
> record or some other area.
> I'm pretty feeble with this crap so can any one help me get
> a clue on  
> what to do?
> These drives may have been in some hard ware raided system
> of the  
> past, am unsure and no one here knows.

1) turn off raid in your bios 

2) type the below command to erase meta data for the raid on the desired drive
dmraid -E -r /dev/sdX

if needed, turn the raid back on (so you can use it for single drives)