Localdisk hook not working
Hi, I'd like to use the localdisk hook of vdsm and have configured everything according to the readme: https://github.com/oVirt/vdsm/tree/master/vdsm_hooks/localdisk After installing the hook, configuring the ovirt-engine, creating the volume group, adding the custom property 'localdisk' to the virtual machine and fixing a small bug in the localdisk-helper, vdsm creates the logical volume on the 'ovirt-local' volume group after starting the virtual machine. Unfortunately nothing more seems to happen then. There is no activity on the NAS which would indicate that the disk image is pulled to the host. I can also see no errors on the host. Is anyone currently running ovirt 4.4 with the localdisk hook? What else can I do to find out why the image is not being copied to my host? Thanks, Tim
After two minutes there is the following error messages in the vdsm.log: ===================== 2020-06-30 11:42:08,420+0200 ERROR (qgapoller/2) [virt.periodic.Operation] <bound method QemuGuestAgentPoller._poller of <vdsm.virt.qemuguestagent.QemuGuestAgentPoller object at 0x7f7fd47bab70>> operation failed (periodic:188) Traceback (most recent call last): File "/usr/lib/python3.6/site-packages/vdsm/virt/periodic.py", line 186, in __call__ self._func() File "/usr/lib/python3.6/site-packages/vdsm/virt/qemuguestagent.py", line 324, in _poller self._qga_capability_check(vm_obj) File "/usr/lib/python3.6/site-packages/vdsm/virt/qemuguestagent.py", line 553, in _qga_capability_check ret = self.call_qga_command(vm, _QEMU_GUEST_INFO_COMMAND) File "/usr/lib/python3.6/site-packages/vdsm/virt/qemuguestagent.py", line 273, in call_qga_command ret = vm.qemu_agent_command(cmd, _COMMAND_TIMEOUT, 0) File "/usr/lib/python3.6/site-packages/vdsm/virt/vm.py", line 5607, in qemu_agent_command self._dom, command, timeout, flags) File "/usr/lib64/python3.6/site-packages/libvirt_qemu.py", line 39, in qemuAgentCommand ret = libvirtmod_qemu.virDomainQemuAgentCommand(domain._o, cmd, timeout, flags) File "/usr/lib/python3.6/site-packages/vdsm/virt/virdomain.py", line 50, in __getattr__ % self.vmid) vdsm.virt.virdomain.NotConnectedError: VM '6efd279a-e9bb-41b9-b805-7b6b15accc3c' was not defined yet or was undefined
On Tue, Jun 30, 2020 at 11:02 AM tim-nospam--- via Users <users@ovirt.org> wrote:
Hi,
I'd like to use the localdisk hook of vdsm and have configured everything according to the readme: https://github.com/oVirt/vdsm/tree/master/vdsm_hooks/localdisk After installing the hook, configuring the ovirt-engine, creating the volume group, adding the custom property 'localdisk' to the virtual machine and fixing a small bug in the localdisk-helper,
What was the bug and how it was fixed?
vdsm creates the logical volume on the 'ovirt-local' volume group after starting the virtual machine. Unfortunately nothing more seems to happen then. There is no activity on the NAS which would indicate that the disk image is pulled to the host. I can also see no errors on the host.
Is anyone currently running ovirt 4.4 with the localdisk hook?
I hope that nobody use this.
What else can I do to find out why the image is not being copied to my host?
You should have logs from the hook in vdsm log. The localdisk hook was a temporary solution and it is not recommended. I don't think anyone is testing this code and it is likely to be broken. We don't have a replacement with the same features, using logical volumes on a local disk (e.g. fast ssd), but if you want to attach the entire device to vm, it should be possible to do this without any hacks in 4.4. The main issue with the localdisk hooks is that engine does not understand what the hook is doing, and the changes made by the hooks behind engine back can cause lot of breakage. Any storage operation on the disks used for the local disk may fail or cause trouble. Nir
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Nir Soffer -
tim-nospam＠bordemann.com