I installed FC8 to and external USB disk for tests. This disk has /boot, small fat16, big ext3 storage and a LVM VG with one LV for my / dir. In order to boot after the install (live KDE CD) I made new initrd:
mkinitrd --preload=ehci-hcd --preload=usb-storage \ --preload=scsi_mod --preload=sd_mod \ /boot/initrd-2.6.23-0.164.rc5.fc8.img 2.6.23-0.164.rc5.fc8
With the update for kernel-2.6.23-0.204.rc8.fc8 all went well, I did not have to make new initrd. After that I removed my swap from that drive and extended my f8 root dir and added my old swap (fc7) to /etc/fstab.
The new swap is on another LVM VG and when I updated to kernel-2.6.23-0.211.rc8.git2.fc8 and mkinitrd-6.0.19-1.fc8 from rawhide it did not boot. I did mkinitrd but that did not help - can't find /dev/root. Turns out mkinitrd activates only the VG which contains my swap, but not the one that contains my root directory. Here's small diff from initrd's init files:
... echo Activating logical volumes -lvm vgchange -ay --ignorelockingfailure VGusb -resume /dev/VGusb/LVuswap +lvm vgchange -ay --ignorelockingfailure VG700l +resume /dev/VG700l/e5swap echo Creating root device. ...
It seems logical that both VGs should be activated in my case - the first one for the root FS and the second one for the swap (in case I suspended to disk).
Anyone else, should I bugzilla this?