Note: This bug is displayed in read-only format because
the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Now that I'm thinking about this, is this really a problem? I mean, with storage migration the whole backing chain is flattened, so different compat version is the least problem. Therefore I'm inclined to close this. Any objections?
Description of problem: I have a running vm using qcow2v3 image on source host. I migrate vm with copy-storage-all flag. After migration, libvirt generates a qcow2v2 image on target host. Version-Release number of selected component (if applicable): on both source and target: libvirt-2.0.0-6.el7.x86_64 qemu-kvm-rhev-2.6.0-22.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. start vm with qcow2v3 image on source # qemu-img info /var/lib/libvirt/images/RHEL-7.3-latest.qcow2 image: /var/lib/libvirt/images/RHEL-7.3-latest.qcow2 file format: qcow2 virtual size: 5.0G (5368709120 bytes) disk size: 1.3G cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 <disk type='file' device='disk'> <driver name='qemu' type='qcow2' io='threads' ioeventfd='on' event_idx='off' detect_zeroes='on'/> <source file='/var/lib/libvirt/images/RHEL-7.3-latest.qcow2'/> <target dev='vda' bus='virtio'/> <boot order='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/> </disk> # virsh start vm-mig Domain vm-mig started 2. migrate vm with copy-storage-all flag # virsh migrate vm-mig qemu+ssh://hp-dl385g7-05.lab.eng.pek2.redhat.com/system --verbose --live --unsafe --copy-storage-all root.eng.pek2.redhat.com's password: Migration: [100 %] 3. check image on target # qemu-img info /var/lib/libvirt/images/RHEL-7.3-latest.qcow2 image: /var/lib/libvirt/images/RHEL-7.3-latest.qcow2 file format: qcow2 virtual size: 5.0G (5368709120 bytes) disk size: 5.0G cluster_size: 65536 Format specific information: compat: 0.10 refcount bits: 16 Actual result: virsh migrate --copy-storage-all genrates a qcow2v2 image on target even if qcow2v3 image is used on source Expected result: Images on both source and target should keep identical Additional info: Addressed libvirtd.log on target host: 2016-08-30 04:43:03.597+0000: 1744: debug : qemuMigrationPrecreateStorage:1687 : Looking up disk target 'vda' (capacity=5368709120) 2016-08-30 04:43:03.598+0000: 1744: debug : qemuMigrationPrecreateStorage:1712 : Proceeding with disk source /var/lib/libvirt/images/RHEL-7.3-latest.qcow2 2016-08-30 04:43:03.598+0000: 1744: debug : qemuMigrationPrecreateDisk:1553 : Precreate disk type=file 2016-08-30 04:43:03.598+0000: 1744: info : virObjectNew:202 : OBJECT_NEW: obj=0x7f7be000e420 classname=virStoragePool 2016-08-30 04:43:03.598+0000: 1744: info : virObjectRef:296 : OBJECT_REF: obj=0x7f7bdc001870 2016-08-30 04:43:03.598+0000: 1744: debug : virStorageVolLookupByName:1293 : pool=0x7f7be000e420, name=RHEL-7.3-latest.qcow2 2016-08-30 04:43:03.598+0000: 1744: debug : storageVolLookupByName:1528 : Storage volume not found: no storage vol with matching name 'RHEL-7.3-latest.qcow2' 2016-08-30 04:43:03.598+0000: 1744: debug : virStorageVolCreateXML:1466 : pool=0x7f7be000e420, xmlDesc=<volume> <name>RHEL-7.3-latest.qcow2</name> <capacity>5368709120</capacity> <target> <format type='qcow2'/> </target> </volume> , flags=1 2016-08-30 04:43:03.624+0000: 1744: debug : virCommandRunAsync:2429 : About to run /usr/local/bin/qemu-img create -f qcow2 -o preallocation=metadata,compat=0.10 /var/lib/libvirt/images/RHEL-7.3-latest.qcow2 5242880K 2016-08-30 04:43:03.626+0000: 1744: debug : virFileClose:102 : Closed fd 26 2016-08-30 04:43:03.626+0000: 1744: debug : virFileClose:102 : Closed fd 29 2016-08-30 04:43:03.627+0000: 1744: debug : virFileClose:102 : Closed fd 31 2016-08-30 04:43:03.627+0000: 1744: debug : virCommandRunAsync:2432 : Command result 0, with PID 14872 2016-08-30 04:43:03.760+0000: 1744: debug : virCommandRun:2280 : Result status 0, stdout: 'Formatting '/var/lib/libvirt/images/RHEL-7.3-latest.qcow2', fmt=qcow2 size=5368709120 compat=0.10 encryption=off cluster_size=65536 preallocation=metadata lazy_refcounts=off refcount_bits=16 ' stderr: '2016-08-30 04:43:03.633+0000: 14872: debug : virFileClose:102 : Closed fd 29 2016-08-30 04:43:03.633+0000: 14872: debug : virFileClose:102 : Closed fd 31 2016-08-30 04:43:03.633+0000: 14872: debug : virFileClose:102 : Closed fd 26 ' 2016-08-30 04:43:03.760+0000: 1744: debug : virFileClose:102 : Closed fd 27 2016-08-30 04:43:03.760+0000: 1744: debug : virFileClose:102 : Closed fd 30 2016-08-30 04:43:03.762+0000: 1744: debug : virStorageFileGetMetadataInternal:937 : path=/var/lib/libvirt/images/RHEL-7.3-latest.qcow2, buf=0x7f7be0017ac0, len=33280, meta->format=14 2016-08-30 04:43:03.762+0000: 1744: info : storageVolCreateXML:1996 : Creating volume 'RHEL-7.3-latest.qcow2' in storage pool 'default' 2016-08-30 04:43:03.762+0000: 1744: info : virObjectUnref:259 : OBJECT_UNREF: obj=0x7f7be00177c0 2016-08-30 04:43:03.762+0000: 1744: info : virObjectUnref:261 : OBJECT_DISPOSE: obj=0x7f7be00177c0 2016-08-30 04:43:03.762+0000: 1744: debug : virStorageVolDispose:589 : release vol 0x7f7be00177c0 RHEL-7.3-latest.qcow2