[linux-lvm] GRUB boot problem with lvm mirror type raid1

[gk180984 at interia.pl]

Hi
I want to ask it is possible boot root file system (via GRUB) from LVM RAID1 volume?
I can boot root file system (with /boot) from linera LVM volume and from mirror volume, but when I create raid1 mirror GRUB can't boot from it:

lvconvert --type raid1 -m1 gsys/vsys

LVM mirror is work:
lvconvert -m1 gsys/vsys

I have two disk and use only LVM, not other raid software. GRUB have lvm module.
Thanks

-- 
Grzesiek