Bug 832336
| Summary: | block streaming "explodes" a qcow2 file to the full virtual size of the disk | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Paolo Bonzini <pbonzini> |
| Component: | qemu-kvm | Assignee: | Paolo Bonzini <pbonzini> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 6.3 | CC: | acathrow, areis, bsarathy, chetan, dyasny, juzhang, kwolf, mkenneth, pbonzini, qzhang, shuang, virt-maint |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-0.12.1.2-2.320.el6 | Doc Type: | Bug Fix |
| Doc Text: |
Running a block_stream operation on a qcow2 image allocated disk space for the entire image, causing the image to grow to the size of the virtual disk. Now, block streaming does not copy unallocated sectors from the backing file. The target image thus will not grow by more than the size of the backing file.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-02-21 13:07:40 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: | |||
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Description
Paolo Bonzini
2012-06-15 08:06:41 UTC
This request was not resolved in time for the current release. Red Hat invites you to ask your support representative to propose this request, if still desired, for consideration in the next release of Red Hat Enterprise Linux. This request was erroneously removed from consideration in Red Hat Enterprise Linux 6.4, which is currently under development. This request will be evaluated for inclusion in Red Hat Enterprise Linux 6.4. Reproduced on qemu-kvm-rhev-0.12.1.2-2.295.el6.x86_64 and verified pass on qemu-kvm-rhev-0.12.1.2-2.334.el6.x86_64. Steps. 1. Install a rhel6.3 qcow2 image 2. create snapshot src.qcow2. # qemu-img create -f qcow2 -b rhel6.3-virtio.qcow2 -F qcow2 src.qcow2 # qemu-img info src.qcow2 image: src.qcow2 file format: qcow2 virtual size: 20G (21474836480 bytes) disk size: 136K cluster_size: 65536 backing file: rhel6.3-virtio.qcow2 # qemu-img info rhel6.3-virtio.qcow2 image: rhel6.3-virtio.qcow2 file format: qcow2 virtual size: 20G (21474836480 bytes) disk size: 3.1G cluster_size: 65536 3. Boot the src.qcow2 (qemu) info block disk0: removable=0 io-status=ok file=/home/src.qcow2 backing_file=rhel6.3-virtio.qcow2 ro=0 drv=qcow2 encrypted=0 4. (qemu) block-stream disk0 (qemu) info block-jobs Streaming device disk0: Completed 28377088 of 21474836480 bytes, speed limit 0 bytes/s ============= On the old version qemu-kvm-rhev-0.12.1.2-2.295.el6.x86_64, it takes very long time to finish the block stream job. And after step 4 finished, the disk size of src.qcow2 is 20G, same as virtual size. # qemu-img info src.qcow2 image: src.qcow2 file format: qcow2 virtual size: 20G (21474836480 bytes) disk size: 20G cluster_size: 65536 On the fixed version qemu-kvm-rhev-0.12.1.2-2.334.el6.x86_64, the block stream job finishes quickly than old version. And finally the disk size is 3.1G, not 20G. # qemu-img info src.qcow2 image: src.qcow2 file format: qcow2 virtual size: 20G (21474836480 bytes) disk size: 3.1G cluster_size: 65536 Based on above, this issue is fixed. 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. http://rhn.redhat.com/errata/RHBA-2013-0543.html |