The underlying fallocate mode/0 compat was added to upstream ZFS with
the following commit:
commit f734301d2267cbb33eaffbca195fc93f1dae7b74
Author: adilger <adil...@dilger.ca>
Date: Thu Jun 18 12:22:11 2020 -0600
linux: add basic fallocate(mode=0/2) compatibility
While the change isn't too large for a SRU, I'd rather wait for this to
land in the next release of ZFS in Ubuntu in 21.04 and see how well this
new functionality works before backporting it to Groovy and Focal.
** Changed in: zfs-linux (Ubuntu Bionic)
Status: New => Won't Fix
** Changed in: zfs-linux (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1847105
Title:
very slow disk creation, snapshotting
Status in virt-manager:
Fix Released
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:
Won't Fix
Status in libvirt source package in Disco:
Won't Fix
Status in virt-manager source package in Disco:
Won't Fix
Status in zfs-linux source package in Disco:
Won't Fix
Status in libvirt source package in Focal:
Triaged
Status in libvirt source package in Groovy:
Triaged
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']
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