To add a node to spica :

 Add a new entry in the ClusterNode dbspica table (fill DataPath also).
 Go to the new node and mkdir DataPath (/data/mix/raid/processing/ here).
 Copy spica in /usr/local/spica/
 Install the perl module : Astro-LibWCS, SAX (found in /usr/local/spica/install/)
 Check dbspica can be accessed from this new mode (alter privilege table).
 dbclient2 (depracated) : no more used.
 copy configuration files for spica in /usr/local/etc/spica
 modify scripts to take into account DataPath (some node have two raids /raid1/, /raid2/, other only one /raid/, others /raid/ and /raid2/ !).