NAME

       VM::EC2::Volume - Object describing an Amazon EBS volume

SYNOPSIS

         use VM::EC2;

         $ec2       = VM::EC2->new(...);
         @vol = $ec2->describe_volumes;
         for my $vol (@vols) {
           $id    = $vol->volumeId;
           $size  = $vol->size;
           $snap  = $vol->snapshotId;
           $zone  = $vol->availabilityZone;
           $status = $vol->status;
           $ctime = $vol->createTime;
           @attachments = $vol->attachments;
           $attachment  = $vol->attachment;
           $origin      = $vol->from_snapshot;
           @snapshots   = $vol->to_snapshots;
         }
         $vols[0]->attach('i-12345','/dev/sdg1');
         $vols[0]->deleteOnTermination('true');
         $vols[0]->detach;
         $vols[0]->create_snapshot('automatic snapshot')

DESCRIPTION

       This object is used to describe an Amazon EBS volume. It is returned by
       VM::EC2->describe_volumes().

METHODS

       The following object methods are supported:

        volumeId         -- ID of this volume.
        size             -- Size of this volume (in GB).
        snapshotId       -- ID of snapshot this volume was created from.
        availabilityZone -- Availability zone in which this volume resides.
        status           -- Volume state, one of "creating", "available",
                            "in-use", "deleting", "deleted", "error"
        createTime       -- Timestamp for when volume was created.
        volumeType       -- The volume type, one of "standard" or "io1"
        iops             -- The number of I/O operations per second that the volume
                            supports, an integer between 100 and 2000. Only valid for
                            volumes of type "io1".
        tags             -- Hashref containing tags associated with this group.
                            See L<VM::EC2::Generic>.

       In addition, this class provides several convenience functions:

   $attachment  = $vol->attachment
   @attachments = $vol->attachments
       The attachment() method returns a VM::EC2::BlockDevice::Attachment object describing the
       attachment of this volume to an instance. If the volume is unused, then this returns
       undef.

       The attachments() method is similar, except that it returns a list of the attachments.
       Currently an EBS volume can only be attached to one instance at a time, but the Amazon
       call syntax supports multiple attachments and this method is provided for future
       compatibility.

   $attachment = $vol->attach($instance,$device)
   $attachment = $vol->attach(-instance_id=>$instance,-device=>$device)
       Attach this volume to an instance using virtual device $device. Both arguments are
       required. The result is a VM::EC2::BlockDevice::Attachment object which you can monitor by
       calling current_status():

           my $a = $volume->attach('i-12345','/dev/sdg');
           while ($a->current_status ne 'attached') {
              sleep 2;
           }
           print "volume is ready to go\n";

   $attachment = $volume->detach()
   $attachment = $volume->detach(-instance_id=>$instance_id, -device=>$device, -force=>$force);
       Detaches this volume. With no arguments, will detach the volume from whatever instance it
       is currently attached to. Provide -instance_id and/or -device as a check that you are
       detaching the volume from the expected instance and device.

       Optional arguments:

        -instance_id    -- ID of the instance to detach from.
        -device         -- How the device is exposed to the instance.
        -force          -- Force detachment, even if previous attempts were
                           unsuccessful.

       The result is a VM::EC2::BlockDevice::Attachment object which you can monitor by calling
       current_status():

           my $a = $volume->detach;
           while ($a->current_status ne 'detached') {
              sleep 2;
           }
           print "volume is ready to go\n";

   $boolean = $vol->deleteOnTermination([$boolean])
       Get or set the deleteOnTermination flag for attached volumes. If the volume is unattached,
       then this causes a fatal error. Called with no arguments, this method returns the current
       state of the deleteOnTermination flag for the volume's attachment. Called with a
       true/false argument, the method sets the flag by calling modify_instance_attributes() on
       the corresponding instance and returns true if successful.

   $snap = $vol->from_snapshot
       Returns the VM::EC2::Snapshot object that this volume was originally derived from. It will
       return undef if the resource no longer exists, or if the volume was created from scratch.

   @snap = $vol->to_snapshots
       If this volume has been used to create one or more snapshots, this method will return them
       as a list of VM::EC2::Snapshot objects.

   $snapshot = $vol->create_snapshot('Description')
       Create a snapshot of the volume and return a VM::EC2::Snapshot object. To ensure a
       consistent snapshot, you should unmount the volume before snapshotting it. The optional
       argument allows you to add a description to the snapshot.

       Here is an example:

         $s = $volume->create_snapshot("Backed up at ".localtime);
         while ($s->current_status eq 'pending') {
            print "Progress: ",$s->progress,"% done\n";
         }
         print "Snapshot status: ",$s->current_status,"\n";

   $status = $vol->current_status
       This returns the up-to-date status of the volume. It works by calling refresh() and then
       returning status().

   $boolean = $vol->auto_enable_io([$new_boolean])
       Get or set the auto-enable IO flag.

   $boolean = $vol->enable_volume_io()
       Enable volume I/O after it has been disabled by an Amazon health check. If successful, the
       call will return true.

STRING OVERLOADING

       When used in a string context, this object will interpolate the volumeId.

SEE ALSO

       VM::EC2 VM::EC2::Generic VM::EC2::Snapshot VM::EC2::BlockDevice
       VM::EC2::BlockDevice::Attachment

AUTHOR

       Lincoln Stein <lincoln.stein@gmail.com>.

       Copyright (c) 2011 Ontario Institute for Cancer Research

       This package and its accompanying libraries is free software; you can redistribute it
       and/or modify it under the terms of the GPL (either version 1, or at your option, any
       later version) or the Artistic License 2.0.  Refer to LICENSE for the full license text.
       In addition, please see DISCLAIMER.txt for disclaimers of warranty.