Hi,
On a host with 5 containers, one of them (VM 104) has very poor backup speed, more than 10 times slower than others.
Here is the last backup log of VM 104 compared to 107, very similar in configuration.
Both have very little activity, same debian system (stretch). All containers are on a LVM partition, all backups are done on local disk.
Backups are done daily, and speed (or lack of it) is consistent every day.
What can I check to find the culprit?
On a host with 5 containers, one of them (VM 104) has very poor backup speed, more than 10 times slower than others.
Here is the last backup log of VM 104 compared to 107, very similar in configuration.
Both have very little activity, same debian system (stretch). All containers are on a LVM partition, all backups are done on local disk.
Backups are done daily, and speed (or lack of it) is consistent every day.
What can I check to find the culprit?
104: 2019-08-30 01:54:23 INFO: Starting Backup of VM 104 (lxc)
104: 2019-08-30 01:54:23 INFO: status = running
104: 2019-08-30 01:54:23 INFO: CT Name: **********
104: 2019-08-30 01:54:23 INFO: backup mode: snapshot
104: 2019-08-30 01:54:23 INFO: ionice priority: 5
104: 2019-08-30 01:54:23 INFO: create storage snapshot 'vzdump'
104: 2019-08-30 01:54:24 INFO: creating archive '/backup/dump/vzdump-lxc-104-2019_08_30-01_54_23.tar.gz'
104: 2019-08-30 02:38:21 INFO: Total bytes written: 2839234560 (2.7GiB, 1.1MiB/s)
104: 2019-08-30 02:38:21 INFO: archive file size: 835MB
104: 2019-08-30 02:38:21 INFO: delete old backup '/backup/dump/vzdump-lxc-104-2019_08_29-01_54_03.tar.gz'
104: 2019-08-30 02:38:22 INFO: remove vzdump snapshot
104: 2019-08-30 02:38:23 INFO: Finished Backup of VM 104 (00:44:00)
107: 2019-08-30 02:56:53 INFO: Starting Backup of VM 107 (lxc)
107: 2019-08-30 02:56:53 INFO: status = running
107: 2019-08-30 02:56:53 INFO: CT Name: **********
107: 2019-08-30 02:56:53 INFO: backup mode: snapshot
107: 2019-08-30 02:56:53 INFO: ionice priority: 5
107: 2019-08-30 02:56:53 INFO: create storage snapshot 'vzdump'
107: 2019-08-30 02:56:54 INFO: creating archive '/backup/dump/vzdump-lxc-107-2019_08_30-02_56_53.tar.gz'
107: 2019-08-30 03:00:39 INFO: Total bytes written: 3413780480 (3.2GiB, 15MiB/s)
107: 2019-08-30 03:00:39 INFO: archive file size: 1.42GB
107: 2019-08-30 03:00:39 INFO: delete old backup '/backup/dump/vzdump-lxc-107-2019_08_29-02_58_14.tar.gz'
107: 2019-08-30 03:00:40 INFO: remove vzdump snapshot
107: 2019-08-30 03:00:40 INFO: Finished Backup of VM 107 (00:03:47)
# pveperf
CPU BOGOMIPS: 54272.32
REGEX/SECOND: 3307147
HD SIZE: 19.55 GB (/dev/md1)
BUFFERED READS: 38.51 MB/sec
AVERAGE SEEK TIME: 27.51 ms
FSYNCS/SECOND: 11.48
DNS EXT: 20.21 ms
DNS INT: 1.17 ms (online.net)
# pveversion -v
proxmox-ve: 5.4-2 (running kernel: 4.15.18-19-pve)
pve-manager: 5.4-13 (running version: 5.4-13/aee6f0ec)
pve-kernel-4.15: 5.4-7
pve-kernel-4.15.18-19-pve: 4.15.18-45
corosync: 2.4.4-pve1
criu: 2.11.1-1~bpo90
glusterfs-client: 3.8.8-1
ksm-control-daemon: 1.2-2
libjs-extjs: 6.0.1-2
libpve-access-control: 5.1-12
libpve-apiclient-perl: 2.0-5
libpve-common-perl: 5.0-54
libpve-guest-common-perl: 2.0-20
libpve-http-server-perl: 2.0-14
libpve-storage-perl: 5.0-44
libqb0: 1.0.3-1~bpo9
lvm2: 2.02.168-pve6
lxc-pve: 3.1.0-3
lxcfs: 3.0.3-pve1
novnc-pve: 1.0.0-3
proxmox-widget-toolkit: 1.0-28
pve-cluster: 5.0-37
pve-container: 2.0-40
pve-docs: 5.4-2
pve-edk2-firmware: 1.20190312-1
pve-firewall: 3.0-22
pve-firmware: 2.0-7
pve-ha-manager: 2.0-9
pve-i18n: 1.1-4
pve-libspice-server1: 0.14.1-2
pve-qemu-kvm: 3.0.1-4
pve-xtermjs: 3.12.0-1
qemu-server: 5.0-54
smartmontools: 6.5+svn4324-1
spiceterm: 3.0-5
vncterm: 1.5-3
zfsutils-linux: 0.7.13-pve1~bpo2
root@pm1:/backup/dump#
# pct config 104
arch: i386
cpulimit: 4
cpuunits: 256
description:
hostname: **********
memory: 1536
net0: name=eth0,bridge=vmbr0,firewall=1,gw=**.210.0.1,hwaddr=**:**:**:**:1b:17,ip=**.**.177.132/24,type=veth
onboot: 1
ostype: debian
rootfs: storage:vm-104-disk-1,size=8G
swap: 512
# pct config 107
arch: i386
cpulimit: 4
cpuunits: 256
description:
hostname: **********
memory: 1536
net0: name=eth0,bridge=vmbr0,firewall=1,gw=**.210.0.1,hwaddr=**:**:**:**:1b:16,ip=**.**.177.131/24,type=veth
onboot: 1
ostype: debian
rootfs: storage:vm-107-disk-1,size=8G
swap: 512
