You can see here that libvirt is attempting to run the 'drive_add'
command, using QMP (JSON) monitor:
QEMU_MONITOR_IO_WRITE: mon=0x7f242c000a80
buf={"execute":"drive_add","arguments":{"pci_addr":"dummy","opts":"file=/dev/disk
/by-path/ip-XXX.XXX.XXX.XXX:3260-iscsi-iqn.2010-10.org.openstack:volume-
0000002b-lun-1,if=none,id=drive-virtio-
disk5,format=raw,cache=none"},"id":"libvirt-7"}
The problem is that although it existed in the HMP monitor, the QEMU
developers decided *not* to make drive_add available in QMP monitor.
They did however add a 'hmp_passthrough' command to let you invoke HMP
commands via QMP. Assuming you have a new enough QEMU and new enough
libvirt, libvirt will not use hmp_passthrough to invoke 'drive_add'.
Since this is not happening for the bug reporter, either their QEMU or
libvirt (or both) packages must be too old.
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https://bugs.launchpad.net/bugs/996840
Title:
Libvirt error when trying to mount ISCSI volumes
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