$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.