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Previously, when using libiscsi storage as the base image (backing file), qemu-img was not able to merge live snapshots to the backing file. Now, the issue has been fixed and live snapshots can be merged.
(In reply to Paolo Bonzini from comment #3)
> Probably just a missing bdrv_reopen implementation. Jeff, please write here
> if there's anything else and you'd like me to take a look.
I think you are right, and I believe this is the same root cause as BZ 1031526. I'll look at putting together a reopen implementation for gluster.
This request was resolved in Red Hat Enterprise Linux 7.0.
Contact your manager or support representative in case you have further questions about the request.
Description of problem: using libiscsi storage as base image(backing file), qemu-img can not merge live snapshot to backing file. Version-Release number of selected component (if applicable): qemu-kvm-rhev-1.5.3-19.el7.x86_64 3.10.0-48.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.boot guest with following cli. <cli>: # /usr/libexec/qemu-kvm -S -M pc-i440fx-rhel7.0.0 -cpu SandyBridge -enable-kvm -m 4G -smp 4,sockets=2,cores=2,threads=1 -name juli -uuid 355a2475-4e03-4cdd-bf7b-5d6a59edaa68 -rtc base=localtime,clock=host,driftfix=slew \ -device virtio-scsi-pci,bus=pci.0,addr=0x5,id=scsi0 -drive file=iscsi://10.66.6.82:3260/iqn.2013-11.com.example:storage.disk1.juli.xyz/1,if=none,id=drive-scsi0-0-0,media=disk,cache=none,format=qcow2,werror=stop,rerror=stop,aio=native -device scsi-hd,drive=drive-scsi0-0-0,bus=scsi0.0,scsi-id=0,lun=0,id=juli,bootindex=0 \ -drive file=iscsi://10.66.6.82:3260/iqn.2013-11.com.example:storage.disk1.juli.xyz/3,if=none,id=drive-virtio0-0-0,media=disk,werror=stop,rerror=stop,cache=none,format=qcow2 -device virtio-blk-pci,bus=pci.0,drive=drive-virtio0-0-0,id=virtio0-0-0 \ -drive file=/home/ISO/en_windows_8.1_preview_x86_dvd_2358833.iso,if=none,media=cdrom,format=raw,aio=native,id=drive-ide1-0-0 -device ide-drive,drive=drive-ide1-0-0,id=ide1-0-0,bus=ide.0,unit=0,bootindex=4 \ -device virtio-balloon-pci,id=ballooning \ -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 \ -net none -k en-us -boot menu=on,reboot-timeout=-1,strict=on \ -qmp tcp:0:4477,server,nowait -serial unix:/tmp/ttyS0,server,nowait -vnc :3 -spice port=5939,disable-ticketing -vga qxl -global qxl-vga.revision=3 -monitor stdio -monitor tcp:0:7777,server,nowait -monitor unix:/tmp/monitor1,server,nowait \ -netdev tap,id=tap1,vhost=on,queues=4,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,ifname=tap-juli -device virtio-net-pci,netdev=tap1,id=nic1,mq=on,vectors=17,mac=1a:59:0a:4b:aa:94 2.Create live snapshot after guest log in (qemu) snapshot_blkdev drive-scsi0-0-0 /home/S1.img (qemu) snapshot_blkdev drive-scsi0-0-0 /home/S2.img 3.shutdown guest. 4.commit S1 to base image. # qemu-img commit -f qcow2 /home/S1.img Actual results: # qemu-img commit -f qcow2 /home/S1.img qemu-img: Image is read-only Expected results: After step 4, commit S1 to base image is successful. Additional info: Also test "Live commit with iSCSI", it works well. After step 2, do "block-commit" via qmp as followings: { "execute": "block-commit", "arguments": { "device": "drive-scsi0-0-0", "base": "iscsi://10.66.6.82:3260/iqn.2013-11.com.example:storage.disk1.juli.xyz/1", "top": "/home/S1.img", "speed": 1000000000 } } {"return": {}} {"timestamp": {"seconds": 1384424071, "microseconds": 403388}, "event": "BLOCK_JOB_COMPLETED", "data": {"device": "drive-scsi0-0-0", "len": 32212254720, "offset": 32212254720, "speed": 1000000000, "type": "commit"}}