In El Capitan Apple introduced a feature which opens Mission Cotrol as soon as you drag a window to the top edge of the screen. That is annoying at least to me. Therefore here is a possible fix:
Disable:
defaults write com.apple.dock mcx-expose-disabled -bool TRUE && killall DockEnable:
defaults delete com.apple.dock mcx-expose-disabled && killall DockAfter running virtual machines in KVM for some time, it might come in handy to be able to resize a KVM guest's raw volumes. In order to do so you first have to shutdown your VM:
virsh destroy <guestname>
In order to add an additional 2 gig to your respective machine, you do the following:
qemu-img resize <diskname>.img +2G
Now restart the machine:
virsh start <guestname>
Then use fdisk inside the guest to make use of the new space:
fdisk /dev/vda
There, you delete the respective partition and immediately recreate it - with more space. Now restart the machine in order to let the kernel make note of the changes:
reboot
After a final resize you're able to make use of the sweet new space:
resize2fs /dev/vda1
Voila!