Slackware as a VM host with qemu

With this article I want you to show how to use Slackware as a host for virtual machine(s) using qemu and kvm. The physical machine I'm using is an old AMD 4000+ single core CPU, has 1GB of RAM, a single 1GBit network interface and is running Slackware64-14.0. I assume that you've basic Slackware and qemu knowledge because this article does not focus to much on Slackware or qemu. The focus of this article is to get both working with each other.
This article covers the following topics:

1. Prepare your physical network interface for bridging
2. Load the kvm module
3. Install qemu
4. Setup a little Slackware sample VM
5. Start/Stop a VM during booting and shutting down the host

ORA-28000: the account is locked

When you try to login as a user to your database and you get the following error:

$ sqlplus "user/password@database"
...
ORA-28000: the account is locked

VxVM vxassist ERROR V-5-1-15304 Cannot allocate space for dco volume

That one gave me a headache and I couldn't find any solution on the internet. So maybe this article might help some one some day.
Story so far: a customer has a RAC envinment based on Veritas CVM. One day a disk was in state FAILING like this: