Under some currently unknown circumstances ha-lvs starts before the network interfaces, preventing it from adding the CVIP address. Stopping and restarting ha-lvs "fixes" the problem.
EXT3 FS on hda1, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
IPVS: sync thread started: state = MASTER, mcast_ifn = eth1, syncid = 0
eth0: link up, 100Mbps, full-duplex, lpa 0x05E1
eth1: no IPv6 routers present
eth0: no IPv6 routers present
Seen running OpenSSI kernels 2.6.12 and 2.6.14 in a XEN hvm (hardware virtual machine).