RHEV VM with sparse disk created on RHEL7 host cannot run on RHEL6 host

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Virtualization (RHEV) 3.4
  • Red Hat Enterprise Virtualization (RHEV) 3.5 beta
  • Red Hat Enterprise Linux 7 hosts are in tech-preview for RHEV 3.4

Issue

Created a VM with a sparse(thin-provisioned) disk with SPM on RHEL 7 host.
Or created a snapshot for a VM with SPM on RHEL7 host.
Now VM cannot run on RHEL6 host.

Getting error similar to this:

2014-09-09 12:57:11.098+0000: 28325: error : qemuMonitorJSONCheckError:357 : internal error unable to execute QEMU command 'transaction': '' uses a qcow2 feature which is not supported by this qemu version: QCOW version 3

Resolution

Until the bug # 1139707 is fixed, it is required to manually edit all the lvs created with RHEL 7 host as SPM to be compatible with RHEL6 hosts.

Please contact Red Hat Support for confirming the issue and detailed steps for resolution.

Root Cause

qcow2 images created with RHEL 7 host are incompatible with RHEL6 hosts.
There is a bug opened qcow2 images created on rhel7 hosts are unreadable on rhel6 hosts to address this issue.

This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.

Comments