Ubuntu 9.10 Desktop CD booted system could not mount internal harddisks attached to a RAID motherboard

Lawrence Tsang tkwinfo at gmail.com
Mon Feb 1 13:39:21 UTC 2010

Hi Tom and All,

     Thanks for the suggestion.

     Below is a listing of the "dmraid" commands that I have run in a root
terminal and the corresponding outputs

root at ubuntu:/dev/mapper# dmraid -r
/dev/sdb: isw, "isw_dfbbifjhde", GROUP, ok, 488397166 sectors, data@ 0
/dev/sda: isw, "isw_dfbbifjhde", GROUP, ok, 488397166 sectors, data@ 0
root at ubuntu:/dev/mapper#

root at ubuntu:/dev/mapper# dmraid -s -g
*** Superset
name   : isw_dfbbifjhde
size   : 976794332
stride : 0
type   : GROUP
status : setup
subsets: 1
devs   : 2
spares : 0
--> Active Subset
name   : isw_dfbbifjhde_C2D-RAID1
size   : 488390912
stride : 128
type   : mirror
status : ok
subsets: 0
devs   : 2
spares : 0
root at ubuntu:/dev/mapper#

     My motherboard has an Intel Software Raid that I had once set my two
250GB internal harddisks into RAID 1. I have (about 1 year ago) then decided
not to use RAID 1 and  set (in the normal BIOS) the two internal disks back
into independent IDE disks. However, I don't know whether the RAID 1 setting
remains in the RAID BIOS or not.

     It seems that Ubuntu 9.10 Desktop may have recognized my two internal
IDE disks as a RAID set.

     How should I remove the RAID set and release my 2 internal disks as
independent IDEs. The commands used must NOT destroy my data in the two
internal disks.

     Any suggestion.


On Mon, Feb 1, 2010 at 9:52 AM, Tom H <tomh0665 at gmail.com> wrote:

> > I have a computer system having 2 internal 250GB harddisks attached to
> > a RAID motherboard. I have not used the RAID feature and have just set
> the
> > two internal harddisks as independent IDE disks. This system works OK in
> a
> > Windows XP environment. I could see and use these 2 internal disks in
> such a
> > XP environment for at least 1 year.
> > However, recently, when I boot my system using the Ubuntu 9.10 Desktop
> > CD in a cdrom, the CD boots normally into a workable Ubuntu 9.10 Desktop.
> > But I just could not use the above mentioned 2 internal harddisks.
> Look into dmraid to disable and remove the dmraid set(s).
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