Thanks for the glossary now I understand well some things, only another question, the wwid is given from the output of the command: multipath -ll or there is another way? excuse me if the question is trivial but I have only a machine with multipath and is in production with kernel 2.4.21 so I cannot test directly multipath-tools before I format next saturday and I would like to reduce the downtime collecting more possible info before installation, thanks Nicola
