In below example, we are attaching an ISCSI disk to VM via VirtalBox.
Of course, you can also attach it directly from the VM if the OS supports it but this is not covered here.

How to find out the original MAC address from a network adapter with manually modified MAC address:

root@core:~# ethtool -P eth3
Permanent address: 10:a2:bc:86:22:16

How to disable ipv6 for a specific network adapter:

root@core:~# echo 1 > /proc/sys/net/ipv6/conf/iscsi/disable_ipv6

How to manually change the network adapter MAC address:

root@core:~# ifconfig eth3 | grep HWaddr
eth3      Link encap:Ethernet  HWaddr c3:de:c3:65:g3:4t

For this you will have to download the needed packages from IBM website. They are not free to download and you need user/pass and license. I will not cover this part at all.
Assuming you have already the needed packages, read what follows:

Version 1 - Replace in modules/gd/classes/GdToolkit.class:

case 'thumbnail':
        case 'scale':
            /* $parameters[0]: target width, [1]: optional target height */
            $targetHeight = empty($parameters[1]) ? $parameters[0] : $parameters[1];
            /* Don't enlarge images for a thumbnail */
            if ($operationName == 'thumbnail'
                    && $width <= $parameters[0] && $height <= $targetHeight) {
                break;

Version 1 - Replace in modules/imagemagick/classes/ImageMagickToolkit.class:

/* Don't enlarge images for a thumbnail */
 	    if ($width > $parameters[0] || $height > $parameters[0]) {
 		$this->_addResizeParam($transform, $parameters[0]);
 		list ($width, $height) =
 		    GalleryUtilities::scaleDimensionsToFit($width, $height, $parameters[0]);
 	    }

with:

/* Create the thumbnail with fixed width */
	    $aspect = $height / $width;
	    $targetWidth = $parameters[0];

If you attach to linux box a disk partitioned under FreeBSD or OS X, you will find this warning message on fdisk command:
"WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted."

In the following example, we will map npiv adapters by using 2 VIO servers.
If you do not understand at all what follows, you better not do it :)

1. Create the virtual adapters for both vios and lpar via HMC (graphical or console).

Not covered here yet. You will have to handle this yourself.

2. Map the adapters on VIO1:

List npivs and search for the ones you have created:

lsmap -all -npiv

During mksysb process you have the chance to encounter many errors. One of them is "An internal packing error occurred: incorrect size" and I will try below to aid you to get pass it.

The error:

# mksysb -eiX /backups-tmp/gzlpar-rootvg.sysb

Creating information file (/image.data) for rootvg.

Creating list of files to back up
Backing up 89961 files......................[color=red]An internal packing error occurred: incorrect size
./var/adm/wtmp will not be backed up.[/color]

Let's say you have created a snapshot, you have used it and now you want to remove it.
What you can do if you get the following message?

core:~# lvscan | grep mylv
  ACTIVE   Original '/dev/datavg/mylv' [2.00 GiB] inherit
  ACTIVE   Snapshot '/dev/datavg/snapmylv' [1.00 GiB] inherit
  
core:~# lvremove -f /dev/datavg/snapmylv
  [color=red]Can't remove open logical volume "snapmylv"[/color]

One way is to ask dmsetup for help:

By listing linked devices in /dev:

root@pluto:~# ls -la /dev/disk/by-path/*iscsi*
lrwxrwxrwx 1 root root  9 Dec  6 14:13 /dev/disk/by-path/ip-9.6.9.3:3260-iscsi-iqn.2014-07.ro.gz.sun:backups-btrfs-lun-0 -> ../../sdb
lrwxrwxrwx 1 root root  9 Dec  6 14:39 /dev/disk/by-path/ip-9.6.9.3:3260-iscsi-iqn.2014-07.ro.gz.sun:pluto-lun-0 -> ../../sdd
lrwxrwxrwx 1 root root  9 Dec  6 14:13 /dev/disk/by-path/ip-9.6.9.4:3260-iscsi-iqn.2014-07.ro.gz.ogle:backups-btrfs-lun-0 -> ../../sdc