Bug 1601871
| Summary: | Target image needs larger size when executing convert with iscsi backend | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Tingting Mao <timao> |
| Component: | qemu-kvm-rhev | Assignee: | Fam Zheng <famz> |
| Status: | CLOSED WONTFIX | QA Contact: | Tingting Mao <timao> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.6 | CC: | chaoyang, chayang, juzhang, michen, ngu, pingl, timao, virt-maint |
| Target Milestone: | rc | Keywords: | Regression |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-07-20 07:14:46 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: | |||
qcow2 needs some extra disk space for metadata, and in the case of fully allocated image, it will require a bit more than the virtual size. Use qemu-img measure command to calculate the necessary space: qemu-img measure /dev/vgtest01/source -O qcow2 The command will count the allocated guest data and estimate metadata. |
Description of problem: Convert would fail when the target image size is the same as the source image with iscsi backend. Version-Release number of selected component (if applicable): qemu-kvm-rhev-2.12.0-7.el7 kernel-3.10.0-919.el7 How reproducible: 2/2 Steps to Reproduce: 1.Create lvs after login the iscsi target #iscsiadm -m node -T iqn.2018-07.com.example:1 -p 10.66.11.19 -l #pvcreate /dev/sdb #vgcreate vgtest /dev/sdb #lvcreate -L 3G -n source vgtest #lvcreate -L 3G -n target vgtest 2.Convert source image to target # qemu-img convert -f raw -O qcow2 /dev/vgtest/source /dev/vgtest/target qemu-img: error while writing sector 6287359: No space left on device Actual results: as above. Expected results: Convert with no error Additional info: 1. When creating target file with 4G size, converting successfully 2. The result is correct with qemu-kvm-rhev-2.10.0 # qemu-img --version qemu-img version 2.10.0(qemu-kvm-rhev-2.10.0-21.el7_5.1) Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers # lvcreate -L 3G -n source vgtest01 Logical volume "source" created. # lvcreate -L 3G -n target vgtest01 Logical volume "target" created. # qemu-img convert -f raw -O qcow2 /dev/vgtest01/source /dev/vgtest01/target -p (100.00/100%) # qemu-img info /dev/vgtest01/target image: /dev/vgtest01/target file format: qcow2 virtual size: 3.0G (3221225472 bytes) disk size: 0 cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 corrupt: false