偶然间发现新路由器的CPU 负载等图表无法显示（图片为解决后截图）。
查看系统日志，rddcached 一直在报错，重启PVE无法解决。
Jan 28 20:45:00 pve systemd[1]: Starting Proxmox VE replication runner... Jan 28 20:45:01 pve systemd[1]: pvesr.service: Succeeded. Jan 28 20:45:01 pve systemd[1]: Started Proxmox VE replication runner. Jan 28 20:45:03 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-node/pve: -1 Jan 28 20:45:03 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-node/pve: /var/lib/rrdcached/db/pve2-node/pve: illegal attempt to update using time 1611837903 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:03 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-vm/100: -1 Jan 28 20:45:03 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-vm/100: /var/lib/rrdcached/db/pve2-vm/100: illegal attempt to update using time 1611837903 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:04 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: -1 Jan 28 20:45:04 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: illegal attempt to update using time 1611837903 when last update time is 1611848609 (minimum one second step) Jan 28 20:45:04 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local: -1 Jan 28 20:45:04 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local: /var/lib/rrdcached/db/pve2-storage/pve/local: illegal attempt to update using time 1611837903 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:13 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-node/pve: -1 Jan 28 20:45:13 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-node/pve: /var/lib/rrdcached/db/pve2-node/pve: illegal attempt to update using time 1611837913 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:13 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-vm/100: -1 Jan 28 20:45:13 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-vm/100: /var/lib/rrdcached/db/pve2-vm/100: illegal attempt to update using time 1611837913 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:13 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local: -1 Jan 28 20:45:13 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local: /var/lib/rrdcached/db/pve2-storage/pve/local: illegal attempt to update using time 1611837913 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:13 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: -1 Jan 28 20:45:13 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: illegal attempt to update using time 1611837913 when last update time is 1611848609 (minimum one second step) Jan 28 20:45:23 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-node/pve: -1 Jan 28 20:45:23 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-node/pve: /var/lib/rrdcached/db/pve2-node/pve: illegal attempt to update using time 1611837923 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:23 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-vm/100: -1 Jan 28 20:45:23 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-vm/100: /var/lib/rrdcached/db/pve2-vm/100: illegal attempt to update using time 1611837923 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:23 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: -1 Jan 28 20:45:23 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: illegal attempt to update using time 1611837923 when last update time is 1611848609 (minimum one second step) Jan 28 20:45:23 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local: -1 Jan 28 20:45:23 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local: /var/lib/rrdcached/db/pve2-storage/pve/local: illegal attempt to update using time 1611837923 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:33 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-node/pve: -1 Jan 28 20:45:33 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-node/pve: /var/lib/rrdcached/db/pve2-node/pve: illegal attempt to update using time 1611837933 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:33 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-vm/100: -1 Jan 28 20:45:33 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-vm/100: /var/lib/rrdcached/db/pve2-vm/100: illegal attempt to update using time 1611837933 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:33 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local: -1 Jan 28 20:45:33 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local: /var/lib/rrdcached/db/pve2-storage/pve/local: illegal attempt to update using time 1611837933 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:33 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: -1 Jan 28 20:45:33 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: illegal attempt to update using time 1611837933 when last update time is 1611848609 (minimum one second step) Jan 28 20:45:43 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-node/pve: -1 Jan 28 20:45:43 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-node/pve: /var/lib/rrdcached/db/pve2-node/pve: illegal attempt to update using time 1611837943 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:43 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-vm/100: -1 Jan 28 20:45:43 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-vm/100: /var/lib/rrdcached/db/pve2-vm/100: illegal attempt to update using time 1611837943 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:44 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local: -1 Jan 28 20:45:44 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local: /var/lib/rrdcached/db/pve2-storage/pve/local: illegal attempt to update using time 1611837943 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:44 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: -1 Jan 28 20:45:44 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: illegal attempt to update using time 1611837943 when last update time is 1611848609 (minimum one second step) Jan 28 20:45:53 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-node/pve: -1 Jan 28 20:45:53 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-node/pve: /var/lib/rrdcached/db/pve2-node/pve: illegal attempt to update using time 1611837953 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:53 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-vm/100: -1 Jan 28 20:45:53 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-vm/100: /var/lib/rrdcached/db/pve2-vm/100: illegal attempt to update using time 1611837953 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:53 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local: -1 Jan 28 20:45:53 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local: /var/lib/rrdcached/db/pve2-storage/pve/local: illegal attempt to update using time 1611837953 when last update time is 1611848739 (minimum one second step) Jan 28 20:45:53 pve pmxcfs[744]: [status] notice: RRDC update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: -1 Jan 28 20:45:53 pve pmxcfs[744]: [status] notice: RRD update error /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: /var/lib/rrdcached/db/pve2-storage/pve/local-lvm: illegal attempt to update using time 1611837953 when last update time is 1611848609 (minimum one second step) Jan 28 20:46:00 pve systemd[1]: Starting Proxmox VE replication runner... Jan 28 20:46:01 pve systemd[1]: pvesr.service: Succeeded.
经过搜索PVE官方社区，获得解决方法，记录一下，供大家参考。
首先查看PVE系统时间是否正确，不正确请先校时。
systemctl stop rrdcached cd /var/lib/ mv rrdcached rrdcached.bck systemctl start rrdcached systemctl restart pve-cluster
系统日志已经不报错误了，稍等一会图表就绘制出来。
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