You may just help the user making an informed decision with all the pros and cons explained in the user interface. Such behavior, common to other virtualization solutions, was beautifully fulfilled before being removed with this commit: https://github.com/virt-manager/virt- manager/commit/15a6a7e2105440df528f75c4df4d2471df28bd1e#diff- 03b5bf10a38d88f4a09a14e211c23e05. Every time I create a new virtual machine I need to use the command line to generate a dynamically allocated storage, which is not good.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1847105 Title: very slow disk creation, snapshotting Status in virt-manager: Confirmed Status in Native ZFS for Linux: New Status in libvirt package in Ubuntu: Triaged Status in virt-manager package in Ubuntu: Triaged Status in zfs-linux package in Ubuntu: New Status in libvirt source package in Bionic: Invalid Status in virt-manager source package in Bionic: Invalid Status in zfs-linux source package in Bionic: New Status in libvirt source package in Disco: Triaged Status in virt-manager source package in Disco: Triaged Status in zfs-linux source package in Disco: New Bug description: This is a regression in eoan for me. I use virt-manager to create vms, and I noticed that creating one now takes more than a minute. Looking at the process listing while the backing disk is being created, I see this qemu-img command line: 15658 ? Ssl 0:00 /usr/sbin/libvirtd 23726 ? Sl 0:04 \_ /usr/bin/qemu-img create -f qcow2 -o preallocation=falloc,compat=1.1,lazy_refcounts /var/lib/libvirt/images/live-server.qcow2 41943040K If I run qemu-img with that preallocation parameter set, even on bionic, then it also takes a very long time. On eoan, for comparison: andreas@nsn7:~$ time qemu-img create -f qcow2 no-prealloc-image.qcow2 40G Formatting 'no-prealloc-image.qcow2', fmt=qcow2 size=42949672960 cluster_size=65536 lazy_refcounts=off refcount_bits=16 real 0m0,016s user 0m0,010s sys 0m0,006s andreas@nsn7:~$ qemu-img info no-prealloc-image.qcow2 image: no-prealloc-image.qcow2 file format: qcow2 virtual size: 40G (42949672960 bytes) disk size: 17K cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 corrupt: false andreas@nsn7:~$ du -hs no-prealloc-image.qcow2 17K no-prealloc-image.qcow2 andreas@nsn7:~$ and now with preallocation=falloc: andreas@nsn7:~$ time qemu-img create -f qcow2 -o preallocation=falloc with-prealloc-image.qcow2 40G Formatting 'with-prealloc-image.qcow2', fmt=qcow2 size=42949672960 cluster_size=65536 preallocation=falloc lazy_refcounts=off refcount_bits=16 real 1m43,196s user 0m3,564s sys 1m26,720s andreas@nsn7:~$ qemu-img info with-prealloc-image.qcow2 image: with-prealloc-image.qcow2 file format: qcow2 virtual size: 40G (42949672960 bytes) disk size: 2.7M cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 corrupt: false andreas@nsn7:~$ du -hs with-prealloc-image.qcow2 2,8M with-prealloc-image.qcow2 andreas@nsn7:~$ ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: libvirt-daemon 5.4.0-0ubuntu5 ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0 Uname: Linux 5.3.0-13-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu7 Architecture: amd64 Date: Mon Oct 7 11:36:03 2019 InstallationDate: Installed on 2019-10-07 (0 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Beta amd64 (20191006) SourcePackage: libvirt UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.libvirt.nwfilter.allow-arp.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/allow-arp.xml'] modified.conffile..etc.libvirt.nwfilter.allow-dhcp-server.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/allow-dhcp-server.xml'] modified.conffile..etc.libvirt.nwfilter.allow-dhcp.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/allow-dhcp.xml'] modified.conffile..etc.libvirt.nwfilter.allow-incoming-ipv4.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/allow-incoming-ipv4.xml'] modified.conffile..etc.libvirt.nwfilter.allow-ipv4.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/allow-ipv4.xml'] modified.conffile..etc.libvirt.nwfilter.clean-traffic-gateway.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/clean-traffic-gateway.xml'] modified.conffile..etc.libvirt.nwfilter.clean-traffic.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/clean-traffic.xml'] modified.conffile..etc.libvirt.nwfilter.no-arp-ip-spoofing.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-arp-ip-spoofing.xml'] modified.conffile..etc.libvirt.nwfilter.no-arp-mac-spoofing.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-arp-mac-spoofing.xml'] modified.conffile..etc.libvirt.nwfilter.no-arp-spoofing.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-arp-spoofing.xml'] modified.conffile..etc.libvirt.nwfilter.no-ip-multicast.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-ip-multicast.xml'] modified.conffile..etc.libvirt.nwfilter.no-ip-spoofing.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-ip-spoofing.xml'] modified.conffile..etc.libvirt.nwfilter.no-mac-broadcast.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-mac-broadcast.xml'] modified.conffile..etc.libvirt.nwfilter.no-mac-spoofing.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-mac-spoofing.xml'] modified.conffile..etc.libvirt.nwfilter.no-other-l2-traffic.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-other-l2-traffic.xml'] modified.conffile..etc.libvirt.nwfilter.no-other-rarp-traffic.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-other-rarp-traffic.xml'] modified.conffile..etc.libvirt.nwfilter.qemu-announce-self-rarp.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/qemu-announce-self-rarp.xml'] modified.conffile..etc.libvirt.nwfilter.qemu-announce-self.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/nwfilter/qemu-announce-self.xml'] modified.conffile..etc.libvirt.qemu.conf: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/qemu.conf'] modified.conffile..etc.libvirt.qemu.networks.default.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/qemu/networks/default.xml'] To manage notifications about this bug go to: https://bugs.launchpad.net/virt-manager/+bug/1847105/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
