Have a quad core workstation that was running WinXP_64 that I want to blow away and install CentOS 6. C6 install process finds raid metadata associated with sda and sdb, and then excludes them from the rest of the installation process.
There doesn't appear to be an option for disassembling the raid as part of the install process. I think there should be.
Any tricks to removing/by-passing the soft raid left over from the previous OS?
Dave M
On Thu, Jul 21, 2011 at 1:24 PM, David McGuffey davidmcguffey@verizon.net wrote:
Have a quad core workstation that was running WinXP_64 that I want to blow away and install CentOS 6. C6 install process finds raid metadata associated with sda and sdb, and then excludes them from the rest of the installation process.
There doesn't appear to be an option for disassembling the raid as part of the install process. I think there should be.
Any tricks to removing/by-passing the soft raid left over from the previous OS?
Dave M
Can you see the 2 HDD's in the console, when you run fdisk -l?
If so, then simply use fdisk to remove all the partitions, then use the installer to partition and format them
I usually boot from the installer CD and go to a virtual terminal (Alt-F1). In the shell;
dd if=/dev/zero of=/dev/disk-i-want-to-destroy bs=512 count=1
I'd guess that the partition table has some microsoft funkiness in it that needs to be wiped.
Take, care with this, it can and does eat data.......
Cheers.
On Thu, Jul 21, 2011 at 9:24 PM, David McGuffey davidmcguffey@verizon.netwrote:
Have a quad core workstation that was running WinXP_64 that I want to blow away and install CentOS 6. C6 install process finds raid metadata associated with sda and sdb, and then excludes them from the rest of the installation process.
There doesn't appear to be an option for disassembling the raid as part of the install process. I think there should be.
Any tricks to removing/by-passing the soft raid left over from the previous OS?
Dave M
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
21.07.2011 15:31, Brian McKerr пишет:
I usually boot from the installer CD and go to a virtual terminal (Alt-F1). In the shell;
dd if=/dev/zero of=/dev/disk-i-want-to-destroy bs=512 count=1
I'd guess that the partition table has some microsoft funkiness in it that needs to be wiped.
Take, care with this, it can and does eat data.......
Cheers.
If this does not work, try to erase the LAST cylinder of each disk. Metadata may be stored there.
dd if=/dev/zero of=/dev/disk-i-want-to-destroy bs=x count=y skip=z
where x,y,z depend on your disk geometry
At Thu, 21 Jul 2011 07:24:19 -0400 CentOS mailing list centos@centos.org wrote:
Have a quad core workstation that was running WinXP_64 that I want to blow away and install CentOS 6. C6 install process finds raid metadata associated with sda and sdb, and then excludes them from the rest of the installation process.
There doesn't appear to be an option for disassembling the raid as part of the install process. I think there should be.
Any tricks to removing/by-passing the soft raid left over from the previous OS?
Is this pure WinXP_64 software RAID or BIOS-assisted 'fakeraid'? If the latter, go into the BIOS and change its settings from 'RAID' to 'AHCI' or other 'native' SATA mode.
The only other thought would be to use a Live CD to clobber the disks (eg using fdisk or 'dd if=/dev/zero of=/dev/sda' or something). It might also be possible to get to a shell process with Alt-F2 in the installer and using fdisk, etc. to clobber the disks -- do this *before* screen where it asks about partitioning, etc.
Dave M
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
From the sounds of it it's fake raid. M$ doesn't leave any signatures
on their raid system that linux will detect. dm/md raid can see fakeraid signatures in newer versions so the installer may be picking up on that.
-- Drew
On 07/21/2011, Robert Heller heller@deepsoft.com wrote:
At Thu, 21 Jul 2011 07:24:19 -0400 CentOS mailing list centos@centos.org wrote:
Have a quad core workstation that was running WinXP_64 that I want to blow away and install CentOS 6. C6 install process finds raid metadata associated with sda and sdb, and then excludes them from the rest of the installation process.
There doesn't appear to be an option for disassembling the raid as part of the install process. I think there should be.
Any tricks to removing/by-passing the soft raid left over from the previous OS?
Is this pure WinXP_64 software RAID or BIOS-assisted 'fakeraid'? If the latter, go into the BIOS and change its settings from 'RAID' to 'AHCI' or other 'native' SATA mode.
The only other thought would be to use a Live CD to clobber the disks (eg using fdisk or 'dd if=/dev/zero of=/dev/sda' or something). It might also be possible to get to a shell process with Alt-F2 in the installer and using fdisk, etc. to clobber the disks -- do this *before* screen where it asks about partitioning, etc.
Dave M
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
-- Robert Heller -- 978-544-6933 / heller@deepsoft.com Deepwoods Software -- http://www.deepsoft.com/ () ascii ribbon campaign -- against html e-mail /\ www.asciiribbon.org -- against proprietary attachments
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Drew wrote on 07/21/2011 11:09 AM:
From the sounds of it it's fake raid. M$ doesn't leave any signatures
on their raid system that linux will detect. dm/md raid can see fakeraid signatures in newer versions so the installer may be picking up on that.
So, erasing the RAID signatures with "dd" in addition to changing the BIOS setting, is indicated.
Phil
On Thu, 2011-07-21 at 11:17 -0400, Phil Schaffner wrote:
Drew wrote on 07/21/2011 11:09 AM:
From the sounds of it it's fake raid. M$ doesn't leave any signatures
on their raid system that linux will detect. dm/md raid can see fakeraid signatures in newer versions so the installer may be picking up on that.
So, erasing the RAID signatures with "dd" in addition to changing the BIOS setting, is indicated.
Phil
Used a CentOS 6 Live DVD to boot. Then discovered that under Applications>System>Disk Utilities one can manage disks to include busting up old raid devices and partitions.
Whatever raid metadata was written by WinXP-64 was destroyed and I was able to do a proper install of CentOS 6.
Thanks go to the upstream developers for enhancing the disk utilities.
DaveM
Whatever raid metadata was written by WinXP-64 was destroyed and I was able to do a proper install of CentOS 6.
I'd still strongly recommend, if you haven't done so, check your BIOS to make sure your SATA controller doesn't have RAID mode enabled. I've seen the odd weird interaction between Linux, the BIOS, and the SATA controller (especially early non-"Intel ICH" family) that was traced back to that setting.
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