Zane C. Bowers-Hadley

NAME

Device::RAID::Poller - Basic RAID status poller, returning RAID disk devices, types, and status.

VERSION

Version 0.1.2

SYNOPSIS

Quick summary of what the module does.

Perhaps a little code snippet.

    use Device::RAID::Poller;

    my $drp = Device::RAID::Poller->new();
    ...

METHODS

new

This initiates the object.

modules_get

Gets the currently specified modules to run.

A return of undef means none are set and at run-time each module will be loaded and tried.

    my @modules=$drp->modules_get;

modules_set

This sets modules to use if one does not wish to attempt to load them all upon load.

list_backends

This lists the available backends. This lists the full backends name, meaning it will return 'Device::RAID::Poller::Backends::fbsdGmiiror';

    my $backends=$drp->list_backends;

The returned value is a hashref where each key is a name of a backend module.

If you want this as a array, you can do the following.

    my @backends=keys %{ $drp->list_backends };

list_loaded

This returns the list of backends that loaded successfully.

load

This loads up the modules. Each one in the list is checked and then if started successfully, it is saved for reuse later.

    my $loaded=$drp->load;
    if ( $loaded ){
        print "One or more backends are now loaded.\n";
    }else{
        print "No usable backends found.\n";
    }

run

Runs the poller backend and report the results.

If nothing is nothing is loaded, load will be called.

    m6 %status=$drp->run;

STATUS HASH

The statu hash made of of hashes. Each subhash is the of the type documented under the section RAID HASH.

The keys of this hash are the device name as regarded by the module in question. These may not represent a valid name under /dev, but may just be a name generated to differentiate it from other devices. Both the ZFS and MegaCLI backends are examples of this. In ZFS cases the zpool is just a mountpoint some place. As to MegaCLI it is a name generated from info gathered from the card.

RAID HASH

status

This can be any of the following values.

    bad - missing disks
    good - all disks are present
    rebuilding - one or more drives is being rebuilt
    unknown - Unable to determine the current status.

name

The name of the device.

backend

The backend that put polled this device. This is the name of the module under "Device::RAID::Poller::Backends::". So "Device::RAID::Poller::Backends::ZFS" would be "ZFS".

good

This is a list of good disks in the array..

bad

This is a list of bad disks in the array.

spare

This is a list of spare disks in the array.

type

This is type of RAID in question. This is a string that describes the RAID array.

This may also be complex, such as for ZFS it is the output of 'zpool status' for the pool in question.

BBUstatus

This can be any of the following values.

    notPresent - No BBU.
    na - Not applicable. Device does not support it.
    failed - BBU failed.
    good - BBU is good.
    charging - BBU is charging.
    unknown - BBU status is not known.

BACKENDS

A backend is a module that exists directly under "Device::RAID::Poller::Backends::".

Three methods must be present and as of currently are expected to run with no arguments.

    new
    usable
    run

The new method creates the object.

The usable method runs some basic checks to see if it is usable or not.

The run method returns a hash with the assorted info. See the section BACKEND RETURN HASH for more information.

BACKEND RETURN HASH

This is composed of keys below.

    devices - A array of hashes as documented in the section RAID HASH.
    stutus - A 0/1 representing if it the the run method was successful.

ERROR HANDLING/CODES

1/invalidModule

A non-existent module to use was specified.

2/notLoaded

Either load has not been called or no usable modules were found.

AUTHOR

Zane C. Bowers-Hadley, <vvelox at vvelox.net>

BUGS

Please report any bugs or feature requests to bug-device-raid-poller at rt.cpan.org, or through the web interface at https://rt.cpan.org/NoAuth/ReportBug.html?Queue=Device-RAID-Poller. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Device::RAID::Poller

You can also look for information at:

ACKNOWLEDGEMENTS

LICENSE AND COPYRIGHT

This software is Copyright (c) 2019 by Zane C. Bowers-Hadley.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)