Op 07-09-2020 om 10:35 schreef Peter Krempa: > On Mon, Sep 07, 2020 at 10:07:29 +0200, Paul van der Vlis wrote: >> Hello, >> >> I have an iSCSI disk with a backup. I want to use that backup on another >> machine to test putting back data. >> >> What I use now is this: >> ---- >> <disk type='block' device='disk'> >> <driver name='qemu' type='raw' cache='directsync' io='native'/> >> <source dev='/dev/disk/by-id/scsi-36e843b6afdddf65dc4e9d4dc2dab66de'/> >> <target dev='vdh' bus='virtio'/> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x0c' >> function='0x0'/> >> </disk> >> ---- >> >> Is it possible to do this read-only? > > Yes, you can add a <readonly/> element under disk to make it read only. > > You'll also need to use <shareable/> on the VM where it's read-write so > that both VMs can access it. Thanks, this did work! With regards, Paul > Note that, if the VM in read-mode is actively writing to the device, the > read-only VM may not know about that and may have the data changed while > reading. > >> What I also could do is to hot-unplug the disk at the production >> machine, and then hot-plug it at the test-machine. But the machines are >> Windows, and I don't know Windows well. > > Windows should support unplug of the virtio device, so this should work > as well. > > -- Paul van der Vlis Linux systeembeheer Groningen https://www.vandervlis.nl/
