I am experiencing very slow migration of LXC containers between nodes when using directory based storage for them.
It seems that Proxmox insists on using
Is there any particular reason why reading is set at 4k? I can understand desire to decrease blocksize on write for sparse to take effect (still, why not 256k like with VMs? And why not only keep obs low but bump ibs to something more sane?) but 4k seems insanely low. In my experience just increasing read to 64k decreases migration time on a simple 4GB single-disk LXC by about 60%.
It seems that Proxmox insists on using
dd of=/var/lib/vz/images/102/vm-102-disk-0.raw conv=sparse bs=64k for write and dd if=/var/lib/vz/images/102/vm-102-disk-0.raw bs=4k for reading.Is there any particular reason why reading is set at 4k? I can understand desire to decrease blocksize on write for sparse to take effect (still, why not 256k like with VMs? And why not only keep obs low but bump ibs to something more sane?) but 4k seems insanely low. In my experience just increasing read to 64k decreases migration time on a simple 4GB single-disk LXC by about 60%.
Code:
proxmox-ve: 6.2-1 (running kernel: 5.4.60-1-pve)
pve-manager: 6.2-11 (running version: 6.2-11/22fb4983)
pve-kernel-5.4: 6.2-6
pve-kernel-helper: 6.2-6
pve-kernel-5.4.60-1-pve: 5.4.60-2
pve-kernel-5.4.55-1-pve: 5.4.55-1
ceph-fuse: 12.2.11+dfsg1-2.1+b1
corosync: 3.0.4-pve1
criu: 3.11-3
glusterfs-client: 5.5-3
ifupdown: not correctly installed
ifupdown2: 3.0.0-1+pve2
ksm-control-daemon: 1.3-1
libjs-extjs: 6.0.1-10
libknet1: 1.16-pve1
libproxmox-acme-perl: 1.0.5
libpve-access-control: 6.1-2
libpve-apiclient-perl: 3.0-3
libpve-common-perl: 6.2-2
libpve-guest-common-perl: 3.1-3
libpve-http-server-perl: 3.0-6
libpve-storage-perl: 6.2-6
libqb0: 1.0.5-1
libspice-server1: 0.14.2-4~pve6+1
lvm2: 2.03.02-pve4
lxc-pve: 4.0.3-1
lxcfs: 4.0.3-pve3
novnc-pve: 1.1.0-1
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.2-12
pve-cluster: 6.1-8
pve-container: 3.2-1
pve-docs: 6.2-5
pve-edk2-firmware: 2.20200531-1
pve-firewall: 4.1-2
pve-firmware: 3.1-3
pve-ha-manager: 3.1-1
pve-i18n: 2.2-1
pve-qemu-kvm: 5.1.0-1
pve-xtermjs: 4.7.0-2
qemu-server: 6.2-14
smartmontools: 7.1-pve2
spiceterm: 3.1-1
vncterm: 1.6-2
zfsutils-linux: 0.8.4-pve1
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