RHCSA labs / Kickstart question

My goal is to launch a virtualized unattended installation of CentOS 6.3 however the installation stops during disk partitioning with the following error message: "error processing drive:
pci-0000:00:01.1-scsi-0:0:0:0
12288MB
ATA QEMU HARDDISK
This device may need to be reinitialized.
[Warning, blah blah blah]...
"
Details are as follow:
- Attempting to deploy CentOS 6.3 x86_64
- Using KVM for the virtualization
- My kickstart file contains relevant "part" statements, as well as: clearpart --all --initlabel
- I also tried explicitly declaring the disk however it didn't help: clearpart --drives=sda --all --initlabel
The command I use to launch the install:
virt-install -n server1.example.com -r 768 -l /media/netinstall --disk path=/var/lib/libvirt/images/server1.example.com.img,size=12 -x "ks=ftp://192.168.100.2/pub/ks.cfg"
The following messages appear on 3rd terminal during the installation:
required disklabel type for sda (1) is None
default disklabel type for sda is msdos
selecting msdos disklabel for sda based on size
I posted this question in linux forum and a couple of days later no one has an answer for me. Since fellow RHCSA candidates hang out in here and Michael Jang's book seems to be popular choice, I'm hoping someone has had the same problem and found a solution
TIA
pci-0000:00:01.1-scsi-0:0:0:0
12288MB
ATA QEMU HARDDISK
This device may need to be reinitialized.
[Warning, blah blah blah]...
"
Details are as follow:
- Attempting to deploy CentOS 6.3 x86_64
- Using KVM for the virtualization
- My kickstart file contains relevant "part" statements, as well as: clearpart --all --initlabel
- I also tried explicitly declaring the disk however it didn't help: clearpart --drives=sda --all --initlabel
The command I use to launch the install:
virt-install -n server1.example.com -r 768 -l /media/netinstall --disk path=/var/lib/libvirt/images/server1.example.com.img,size=12 -x "ks=ftp://192.168.100.2/pub/ks.cfg"
The following messages appear on 3rd terminal during the installation:
required disklabel type for sda (1) is None
default disklabel type for sda is msdos
selecting msdos disklabel for sda based on size
I posted this question in linux forum and a couple of days later no one has an answer for me. Since fellow RHCSA candidates hang out in here and Michael Jang's book seems to be popular choice, I'm hoping someone has had the same problem and found a solution

TIA
2018 goals: Security+, CCNA CyberOps (Cohort #6), eJPT, CCNA R&S 2019 goals: RHCE ????, OSCP || CISSP
Comments
As of RHEL 6.3, clearpart --initlabel no longer initializes disks. Instead, "zerombr" and "ignoredisk --only-use=XXX" must be used. I.e.:
zerombr
ignoredisk --only-use=sda
would initialize disk sda.
Ref: https://access.redhat.com/knowledge/solutions/117513
zerombr
clearpart --all --initlabel
check out 32.4. Kickstart Options
hopefully that gets you in the right direction, let me know if you need anything else