Bug 999763

Summary: fail to create VPC file format disk with large size using qemu-img
Product: Red Hat Enterprise Linux 6 Reporter: Sibiao Luo <sluo>
Component: qemu-kvmAssignee: Jeff Cody <jcody>
Status: CLOSED WONTFIX QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.5CC: acathrow, bsarathy, chayang, jcody, juzhang, kwolf, michen, mkenneth, qzhang, virt-maint, xfu
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 1058145 (view as bug list) Environment:
Last Closed: 2014-06-11 18:40:31 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 1058145    

Description Sibiao Luo 2013-08-22 04:48:50 UTC 
Description of problem:
As we have backport support for vhd(x) image format to rhel6.5, refer to bug 963420, but fail to create VHD(X) format disk files over 127GB using qemu-img.
btw, also tried rhel7.0 witch has no such issue.

Version-Release number of selected component (if applicable):
host info:
# uname -r && rpm -q qemu-kvm-rhev
2.6.32-412.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.397.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.# qemu-img create -f vpc sluo-data-disk.vhd 127G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=136365211648 
# qemu-img info sluo-data-disk.vhd
image: sluo-data-disk.vhd
file format: vpc
virtual size: 127G (136365219840 bytes)
disk size: 260K
2.# qemu-img create -f vpc sluo-data-disk.vhd 128G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=137438953472 
The image size is too large for file format 'vpc'
3.# qemu-img create -f vpc sluo-data-disk.vhd 130G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=139586437120 
The image size is too large for file format 'vpc'

Actual results:

Expected results:
it could create VHD(X) format disk files over 127GB using qemu-img successfully.

Additional info:
Tried rhel7.0, host info,
# uname -r && rpm -q qemu-kvm
3.10.0-3.el7.x86_64
qemu-kvm-1.5.2-4.el7.x86_64

# qemu-img create -f vpc sluo-data-disk.vhd 130G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=139586437120 
# qemu-img info sluo-data-disk.vhd
image: sluo-data-disk.vhd
file format: vpc
virtual size: 130G (139596710400 bytes)
disk size: 264K
Comment 4 Sibiao Luo 2014-01-27 05:24:00 UTC 
Retried it that fail to create VPC file format disk over 2032GB using qemu-img with the latest qemu-kvm version.

host info:
# uname -r && rpm -q qemu-kvm-rhev
2.6.32-425.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.415.el6.x86_64

# qemu-img create -f vpc sluo-data-disk.vhd 2031G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=2180769644544 
# qemu-img create -f vpc sluo-data-disk.vhd 2032G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=2181843386368 

# qemu-img create -f vpc sluo-data-disk.vhd 2033G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=2182917128192 
The image size is too large for file format 'vpc'
# qemu-img create -f vpc sluo-data-disk.vhd 2034G
Formatting 'sluo-data-disk.vhd', fmt=vpc size=2183990870016 
The image size is too large for file format 'vpc'

Best Regards,
sluo
Comment 6 Ademar Reis 2014-06-11 18:40:31 UTC 
Corner case on the creation of vpc images. Works on RHEL7, closing as WONTFIX for RHEL6.