a bug in OpenSSI 0.96-2 master installation:
scipt /linuxrc uses /sbin/cluster_config,which is linked to
/usr/sbin/cluster_config. When /linuxrc is called, only
root device has been mounted. If /usr is another device
other than root device, linuxrc can not find cluster_config.
May be another copy of cluster_config, not just an
symbolic link, should be put into /sbin.