I have a problem with LVM,

I just upgraded my Fedora 10 box to Fedora 12, by removing the old IDE OS drive and installing a new SATA OS drive.

In Fedora 10, I had a 3 disk LVM raid-0 array and it was working fine. I unplugged all the drives when I did the fresh install of Fedora 12, just to avoid anything being accidentally deleted/formatted

Now, when I plugged the drives back in, and boot in the Fedora 12, LVM says I have an uninitialized drive under the Logical Volume for my RAID-0 Array. Also, when I boot, I get an error message, something about "nvidia: cannot find drive 1/3" or something like that. Everything shows up in the BIOS.

Also, I can plug my old OS drive in, and boot back into Fedora 10 and everything works fine, so there is nothing wrong with the disks, just Fedora 12 can't detect one of them.

I am also having a problem with another drive in LVM, which is just a standalone, single 750 GB drive. It also shows up in LVM as uninitialized and won't mount. But it also works fine when I boot back to Fedora 10.

Does anyone have any help to offer?

Could this be caused if I changed order of the cables on the drives?

Why does it work fine in Fedora 10 and not in Fedora 12?

Thank you

When you installed F12, did the installer detect all 3 of your drives?

Also look at this which may help - its for CentOS but should pretty much work the same in F12 - http://centos.org/docs/5/html/5.2/De...m-new-hdd.html

I suspect its not LVM that's the problem but rather the kernel itself not detecting your drives.

no, i unplugged the drives when I installed F12. I didn't want to accidentally delete anything.

I don't want to "initialize" anything because won't that delete my data? Like I said, the drives show up in LVM, just as "unitialized" and "unknown device"

How can i tell if the kernel detects the drive or not?

OK i fixed it. It looks like they switched from dmraid in F10 to mdadm in F12 for RAID. So, use the following kernel boot option:

nodmraid

and now everything works perfect. Too bad I had already started to back everything up to DVD.... lol luckily I got to my 5th DVD and was like "this is crazy" and kept searching for a solution, haha

Probably a lot of people would be affected by this going from F10 to F12 considering the switch from dmraid to mdadm, so now you know