<div>Hi Tom and All,</div>
<div> </div>
<div> Thanks for the update.</div>
<div> </div>
<div> I expect the command "dmraid -an" in a root terminal would do the job of de-activating the detected BIOS RAID set while keeping the metadata of the BIOS RAID set. (At this mean time I don't want to remove the settings (metadata) in the RAID BIOS, I may remove it later.)</div>
<div> </div>
<div> I am now in the testing period of Ubuntu 9.10. I do not prepare to install Ubuntu 9.10 Desktop into my internal harddisk yet. I just want to boot my system using the 9.10 CD and use the booted system to access all my internal and removable disks. So I expect to perform some commands in the booted system in order to de-activate the remaining RAID set and recover access to my internal disk partitions.</div>
<div> </div>
<div> Thanks for Tom pointing out that RAID set de-activation may not destroy data in the relating harddisks. I want to make sure that the concrete command "dmraid -an" would not cause me trouble by making any data loss.</div>
<div> </div>
<div> Does anyone have the experience of using such dmraid command that is doing what I expect it to do here ?</div>
<div> </div>
<div> Moreover, suppose "dmraid -an" does the right job, how could I recover access to sda1, sda2 and sdb1 ? I could not afford a reboot as I am using a CD to boot which always returns my system to the same initial conditions.</div>
<div> </div>
<div> Glad to have your helpful suggestion.</div>
<div> </div>
<div>Regards</div>
<div>Lawrence</div>
<div><br> </div>
<div class="gmail_quote">On Tue, Feb 2, 2010 at 8:00 AM, Tom H <span dir="ltr"><<a href="mailto:tomh0665@gmail.com">tomh0665@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">> Thanks for the suggestion.<br>
<div class="im"><br>> root@ubuntu:/dev/mapper# dmraid -r<br>> /dev/sdb: isw, "isw_dfbbifjhde", GROUP, ok, 488397166 sectors, data@ 0<br>> /dev/sda: isw, "isw_dfbbifjhde", GROUP, ok, 488397166 sectors, data@ 0<br>
<br></div>
<div class="im">> My motherboard has an Intel Software Raid that I had once set my two<br>> 250GB internal harddisks into RAID 1. I have (about 1 year ago) then decided<br>> not to use RAID 1 and set (in the normal BIOS) the two internal disks back<br>
> into independent IDE disks. However, I don't know whether the RAID 1 setting<br>> remains in the RAID BIOS or not.<br><br>> It seems that Ubuntu 9.10 Desktop may have recognized my two internal<br>> IDE disks as a RAID set.<br>
<br>> How should I remove the RAID set and release my 2 internal disks as<br>> independent IDEs. The commands used must NOT destroy my data in the two<br>> internal disks.<br><br></div>You're welcome.<br><br>
The raid set is probably being activated because of the remaining raid<br>metadata from your experiment.<br><br>The activation of the raid set is not deleting your ntfs data on sda1,<br>sda2, and sdb1, is it? So the deactivation will not do so either.<br>
<br>mdadm allows you to unmount a raid device, disable it, and delete its<br>raid metadata without destroying the "real" data so dmraid must too.<br><br>If/once you follow the three steps above, purge dmraid from the CD<br>
before launching the installer in order to disallow it from<br>re-detecting the raid set.<br><font color="#888888"><br>--<br></font>
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