Need help booting into LVM root

I'm trying to boot an LVM-based root filesystem (btw, it's ext4 as well). I created a raw disk image out of spare space, made it a pv, created a vg from that, created a few lv inside of that, mounted them under /mnt/lvm and rsync'd -ax root over to them. I edited /etc/fstab to mount them instead of the straight partitions (/dev/rootvg/rootlv). I mkinitrd a new initrd file. I created an initrd disk image and copied my initrd to it. I put the initrd into place in the console and changed the root device to /dev/rootvg/rootlv (I tried /dev/mapper/rootvg-rootlv as well). It still doesn't appear to be able to access the root filesystem. This is all based on Fedora-11 32 bit. Any ideas? The reboot gives me this on the console:

SCTP: Hash tables configured (established 65536 bind 65536)

Using IPI Shortcut mode

registered taskstats version 1

XENBUS: Device with no driver: device/console/0

md: Waiting for all devices to be available before autodetect

md: If you don't use raid, use raid=noautodetect

md: Autodetecting RAID arrays.

md: Scanned 0 and added 0 devices.

md: autorun …

md: … autorun DONE.

RAMDISK: ext2 filesystem found at block 0

RAMDISK: Loading 32768KiB [1 disk] into ram disk… done.

kjournald starting. Commit interval 5 seconds

EXT3 FS on ram0, internal journal

EXT3-fs: mounted filesystem with writeback data mode.

VFS: Mounted root (ext3 filesystem) on device 1:0.

VFS: Cannot open root device "mapper/rootvg-rootlv" or unknown-block(0,0)

Please append a correct "root=" boot option; here are the available partitions:

ca00 45875200 xvda driver: vbd

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Pid: 1, comm: swapper Not tainted 2.6.32-linode23 #1

Call Trace:

[] ? panic+0x42/0xf2

[] ? mountblockroot+0x158/0x26c

[] ? mount_root+0x46/0x5a

[] ? initrd_load+0x27e/0x381

[] ? prepare_namespace+0xe0/0x1a2

[] ? sys_access+0x1f/0x30

[] ? kernel_init+0x17b/0x195

[] ? kernel_init+0x0/0x195