Bug 1249587
| Summary: | "migrate --copy-storage-inc" doesn't handle the image backing file | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Fangge Jin <fjin> |
| Component: | libvirt | Assignee: | Peter Krempa <pkrempa> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 7.2 | CC: | dyuan, hhan, mzhan, rbalakri, smitterl, zpeng |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | libvirt-1.2.17-4.el7 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2015-11-19 06:49:54 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: | |
| Embargoed: | |||
The previous additional info is not accurate, "copy-storage-all" also doesn't have backing info after migration, but the guest can restart and work well on target:
# qemu-img info /var/lib/libvirt/images/test.qcow2
image: /var/lib/libvirt/images/test.qcow2
file format: qcow2
virtual size: 9.0G (9663676416 bytes)
disk size: 9.0G
cluster_size: 65536
Format specific information:
compat: 0.10
refcount bits: 16
I can reproduce this . verify bug with libvirt build: libvirt-1.2.17-7.el7.x86_64 1: step same with bug's description. 2: # virsh migrate --verbose --live --persistent rhel7 qemu+ssh://$target_ip/system --copy-storage-inc error: Operation not supported: pre-creation of storage targets for incremental storage migration is not supported move to verified. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2015-2202.html |
Description: The guest image has a backing file on shared nfs server. (Don't pre-create image on target host.) After migration with --copy-storage-inc, the backing file info is missing on target host. And the guest restart failed with following error: Booting from Hard Disk... Boot failed: not a bootable disk No bootable device Version: libvirt-1.2.17-3.el7.x86_64 qemu-kvm-rhev-2.3.0-13.el7.x86_64 How reproducible: 100% Steps to Reproduce: 0.Prepare two hosts: source(RHEL7.2) and target(RHEL7.2) 1.Prepare an image with a guest installed with qcow2 type and put it in shared nfs. 2.Create an image based on the above image on source host: # qemu-img create /var/lib/libvirt/images/mig2inc.qcow2 -f qcow2 -b /90121/fjin/r71-3.qcow2 Formatting '/var/lib/libvirt/images/mig2inc.qcow2', fmt=qcow2 size=9663676416 backing_file='/90121/fjin/r71-3.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16 # qemu-img info /var/lib/libvirt/images/mig2inc.qcow2 image: /var/lib/libvirt/images/mig2inc.qcow2 file format: qcow2 virtual size: 9.0G (9663676416 bytes) disk size: 21M cluster_size: 65536 backing file: /90121/fjin/r71-3.qcow2 Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 corrupt: false 3.Start a guest with image "/var/lib/libvirt/images/mig2inc.qcow2" on source host. # virsh start mig2 Domain mig2 started 4.Migrate the guest to target host(Note: don't pre-create storage on target): # virsh migrate --verbose --live --persistent mig2 qemu+ssh://10.66.6.6/system --copy-storage-inc Migration: [100 %] 5.Check the image info of the guest on target host: # qemu-img info /var/lib/libvirt/images/mig2inc.qcow2 image: /var/lib/libvirt/images/mig2inc.qcow2 file format: qcow2 virtual size: 9.0G (9663676416 bytes) disk size: 22M cluster_size: 65536 Format specific information: compat: 0.10 refcount bits: 16 Compared with the image info on source host, to find that backing file info is missing. 6.Destroy the guest and restart on target host: # virsh destroy mig2 Domain mig2 destroyed # virsh start mig2 Domain mig2 started Guest start failed with the following error: Booting from Hard Disk... Boot failed: not a bootable disk No bootable device Actual results: As step 5~6. Expected results: The "backing file" info can be preserved after migration. Additional info: "copy-storage-all" doesn't have such issue.