Reinstalling GRUB - Can't boot Sabayon LVM [Solved]

[Mithra]

Hi all. I recently reinstalled my windows which obviously obliterated GRUB, and I've been having more problems than usual getting it back. I've finally managed to get the actual GRUB boot screen however it doesn't find my Sabayon partition (which is stored on an LVM).

Going into the GRUB prompt I have been following:
http://tuxers.com/main/instigating-a-manual-boot-from-the-grub-prompt/

and this works fine ( I call " linux /kernel*" rather than "linux /linuz*" though ) until it boots, at which point it brings up the error that the path I have used to the root is invalid (can't remember the exact code but can check if necessary).

The path I have been using is /dev/vg_sabayon/lv_root. My vg_sabayon has lv_root, lv_home and lv_swap.

However when I run "ls" GRUB also gives me, along with the standard (hdaX,X), the options (vg_sabayon-lv_root), (vg_sabayon-lv_home) and (vg_sabayon-lv_swap). Should I pass one of these as root instead? Or is there some other trick I'm missing?

Any help very very much appreciated, thanks!

[lxnay]

default Sabayon partition layout puts the /boot partition outside LVM.
Also, "dolvm" boot argument is mandatory when booting Sabayon systems in where the root filesystem is behind LVM.

[Mithra]

default Sabayon partition layout puts the /boot partition outside LVM.
Also, "dolvm" boot argument is mandatory when booting Sabayon systems in where the root filesystem is behind LVM.

Aha, thanks! Would grub be able to read the /boot partition? LVM is on sda5 and sda4 is I believe labelled as "/boot" but grub says it can't read it?

Edit: Sorry to be thick, but could anyone give me some advice on exactly how I should alter the method in the link to work for Sabayon? Help would be brilliant thanks!

[grimly64]

What version of Windows? If it Windows 7, and your Windows and Sabayon are on the same hard drive, then try using EasyBCD.

http://wiki.pcbsd.org/index.php/Dual_Booting

Scroll down to EasyBCD to see how to use it.

Sorry if this didn't help.

[Mithra]

Sorted, thanks so much!