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@services = ( { serviceid => '1',
                name      => 'servicea',
...
                name      => 'serviceb',
                host      => [ qw( hostc ) ] },
             );

foreach my $svc ( @services ) {
    # list of hosts: @{ $svc->{host} }
    # name: $svc->{name}
}

%services
    = ( 'servicea' => { serviceid => '1',
...
        'serviceb' => { serviceid => '2',
                        host      => [ qw( hostc ) ] },
      );