=head1 NAME

Disk::SMART - Provides an interface to smartctl to return disk stats and to run tests.

=head1 SYNOPSIS

Disk::SMART is an object oriented module that provides an interface to get SMART disk info from a device as well as initiate testing.

    use Disk::SMART;

    my $smart = Disk::SMART->new('/dev/sda', '/dev/sdb');

    my $disk_health = $smart->get_disk_health('/dev/sda');

=head1 CONSTRUCTOR

=head2 B<new(DEVICE)>

Instantiates the Disk::SMART object

C<DEVICE> - Device identifier of a single SSD / Hard Drive, or a list. If no devices are supplied then it runs get_disk_list() which will return an array of detected sdX and hdX devices.

    my $smart = Disk::SMART->new();
    my $smart = Disk::SMART->new( '/dev/sda', '/dev/sdb' );
    my @disks = $smart->get_disk_list();

Returns C<Disk::SMART> object if smartctl is available and can poll the given device(s).

=head1 USER METHODS

=head2 B<get_disk_attributes(DEVICE)>

Returns hash of the SMART disk attributes and values

C<DEVICE> - Device identifier of a single SSD / Hard Drive

    my %disk_attributes = $smart->get_disk_attributes('/dev/sda');

=head2 B<get_disk_errors(DEVICE)>

Returns scalar of any listed errors

C<DEVICE> - Device identifier of a single SSD/ Hard Drive

    my $disk_errors = $smart->get_disk_errors('/dev/sda');

=head2 B<get_disk_health(DEVICE)>

Returns the health of the disk. Output is "PASSED", "FAILED", or "N/A". If the device has positive values for the attributes listed below then the status will output that information.

Eg. "FAILED - Reported_Uncorrectable_Errors = 1"

The attributes are:

5 - Reallocated_Sector_Count

187 - Reported_Uncorrectable_Errors

188 - Command_Timeout

197 - Current_Pending_Sector_Count

198 - Offline_Uncorrectable

If Reported_Uncorrectable_Errors is greater than 0 then the drive should be replaced immediately. This list is taken from a study shown at https://www.backblaze.com/blog/hard-drive-smart-stats/


C<DEVICE> - Device identifier of a single SSD / Hard Drive

    my $disk_health = $smart->get_disk_health('/dev/sda');

=head2 B<get_disk_list>

Returns list of detected hda and sda devices. This method can be called manually if unsure what devices are present. 

    $smart->get_disk_list;

=head2 B<get_disk_model(DEVICE)>

Returns the model of the device. eg. "ST3250410AS".

C<DEVICE> - Device identifier of a single SSD / Hard Drive

    my $disk_model = $smart->get_disk_model('/dev/sda');

=head2 B<get_disk_temp(DEVICE)>

Returns an array with the temperature of the device in Celsius and Farenheit, or N/A.

C<DEVICE> - Device identifier of a single SSD / Hard Drive

    my ($temp_c, $temp_f) = $smart->get_disk_temp('/dev/sda');

=head2 B<run_short_test(DEVICE)>

Runs the SMART short self test and returns the result.

C<DEVICE> - Device identifier of SSD/ Hard Drive

    $smart->run_short_test('/dev/sda');

=head2 B<update_data(DEVICE)>

Updates the SMART output and attributes for each device. Returns undef.

C<DEVICE> - Device identifier of a single SSD / Hard Drive or a list of devices. If none are specified then get_disk_list() is called to detect devices.

    $smart->update_data('/dev/sda');

=head1 COMPATIBILITY

  This module should run on any UNIX like OS with Perl 5.10+ and the smartctl progam installed from the smartmontools package.

=head1 AUTHOR

 Paul Trost <ptrost@cpan.org>

=head1 LICENSE AND COPYRIGHT

 Copyright 2015 by Paul Trost
 This script is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License v2, or at your option any later version.
 <http://gnu.org/licenses/gpl.html>

