Thanks again but how does that work when a VM is configured to have more than one disk?
If I have a VM with a /dev/vda disk and a /dev/vdb disk, when I turn the vhostmd hook on the vm metric device gets created as /dev/vdb and the original /dev/vdb disk gets bumped to /dev/vdc. Is that expected behavior? Will that not cause problems? Thanks, Simon From: Arsène Gschwind [mailto:[email protected]] Sent: Tuesday, 19 April, 2016 13:06 To: Simon Barrett <[email protected]>; [email protected] Subject: Re: [ovirt-users] vhostmd vdsm-hook The metric information are available on this additional disk /dev/vdb. You may install the package vm-dump-metrics and use the command vm-dump-metrics which will display all metrics in an xml format. Arsène On 04/19/2016 10:48 AM, Simon Barrett wrote: Thanks Arsène, I have vhostmd running on the ovirt node and have set the sap_agent to true on the VM configuration. I also stopped and started the VM to ensure that the config change took effect. On the oVirt node I see the vhostmd running and see the following entry in the qemu-kvm output: drive file=/dev/shm/vhostmd0,if=none,id=drive-virtio-disk701,readonly=on,format=raw -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x8,drive=drive-virtio-disk701,id=virtio-disk701 The part I wasn't quite understanding was how this presented itself on the VM but I now see a new disk device "/dev/vdb". If I cat the contents of /dev/vdb I now see the information that is provided from the ovirt node, which is great news and very useful. Thanks for your help. Simon From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Arsène Gschwind Sent: Monday, 18 April, 2016 16:03 To: [email protected]<mailto:[email protected]> Subject: Re: [ovirt-users] vhostmd vdsm-hook Hi Simon, You will need to have vhostmd running on the oVirt node and set the "sap_agent" custom property for the vm as you may see on the screenshot. [sap_agent] Arsène On 04/15/2016 12:15 PM, Simon Barrett wrote: I'm trying to use the vhostmd vdsm host to access ovirt node metrics from within a VM. Vhostmd is running and updating the /dev/shm/vhostmd0 on the ovirt node. The part I'm stuck on is: "This disk image is exported read-only to guests. Guests can read the disk image to see metrics" from http://www.ovirt.org/develop/developer-guide/vdsm/hook/vhostmd/ Does the hook do this by default? I don't see any new read-only device mounted in the guest. Is there additional work I need to do to mount this and access the data from within the guest? Many thanks, Simon _______________________________________________ Users mailing list [email protected]<mailto:[email protected]> http://lists.ovirt.org/mailman/listinfo/users
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