NetApp API для получения вывода 'df'

не

#!/usr/bin/env perl
use strict;
use warnings;

use XML::Twig;
use LWP;

my $twig = XML::Twig->new( 'pretty_print' => 'indented' );
$twig->set_root(
    XML::Twig::Elt->new(
        'netapp',
        {   version => 1.7,
            vfiler  => "somevfiler",
            xmlns   => "http://www.netapp.com/filer/admin",
        },
    )
);
my $api_req = $twig->root->insert_new_elt('system-cli');
my $args    = $api_req->insert_new_elt('args');
$args->insert_new_elt( 'last_child', 'arg', 'df' );
$args->insert_new_elt( 'last_child', 'arg', '-k' );

$twig->set_doctype('netapp SYSTEM "file:/etc/netapp_filer.dtd"');
$twig->set_xml_version("1.0");
$twig->set_encoding('utf-8');

$twig->print;

exit;

my $user_agent = LWP::UserAgent->new(
    'ssl_opts' => {
        'verify_hostname' => 0,
        'SSL_version'     => 'SSLv3',
    }
);

my $request =
    HTTP::Request->new( 'POST' =>
        'https://myfilername/servlets/netapp.servlets.admin.XMLrequest_filer'
    );
$request->authorization_basic( 'username_here', 'password_here' );
$request->content( $twig->sprint );

my $results = $user_agent->request($request);
if ( not $results->is_success ) {
    print "Error: ", $results->status_line;
    exit;
}

my $results_xml = XML::Twig->new( 'pretty_print' => 'indented_a' );
$results_xml->parse( $results->content );
$results_xml->print;