If you are trying to install PERL Modules on a CageFS based server, after you run the installation, you will need to go ahead and force a CageFS update:
root@sharedcp-1-2 [~]# cpan DBI
CPAN: Storable loaded ok (v2.20)
Reading '/root/.cpan/Metadata'
Database was generated on Tue, 11 Mar 2014 16:41:02 GMT
CPAN: Module::CoreList loaded ok (v2.18)
DBI is up to date (1.631).
root@sharedcp-1-2 [~]# cpan DBD::mysql
CPAN: Storable loaded ok (v2.20)
Reading '/root/.cpan/Metadata'
Database was generated on Tue, 11 Mar 2014 16:41:02 GMT
CPAN: Module::CoreList loaded ok (v2.18)
DBD::mysql is up to date (4.026).Without running the below command, the perl modules are not available for the user to access within their account.
/usr/bin/cagefsctl --force-update