Proxmox 6.4-13 slow backup

[pushtius1]

Hi everyone, i have a problem with my backups. My speeds are slow, even when the backups are on local disk or NFS.

this is my info:

root@server:~# fio --size=9G --bs=64k --rw=write --direct=1 --runtime=60 --name=64kwrite --group_reporting
64kwrite: (g=0): rw=write, bs=(R) 64.0KiB-64.0KiB, (W) 64.0KiB-64.0KiB, (T) 64.0KiB-64.0KiB, ioengine=psync, iodepth=1
fio-3.12
Starting 1 process
64kwrite: Laying out IO file (1 file / 9216MiB)
Jobs: 1 (f=1): [W(1)][100.0%][w=499MiB/s][w=7981 IOPS][eta 00m:00s]
64kwrite: (groupid=0, jobs=1): err= 0: pid=9450: Sat Mar 12 11:29:48 2022
  write: IOPS=7936, BW=496MiB/s (520MB/s)(9216MiB/18580msec); 0 zone resets
    clat (usec): min=77, max=173860, avg=122.59, stdev=482.04
     lat (usec): min=77, max=173861, avg=123.75, stdev=482.04
    clat percentiles (usec):
     |  1.00th=[   82],  5.00th=[   86], 10.00th=[   90], 20.00th=[  102],
     | 30.00th=[  109], 40.00th=[  114], 50.00th=[  120], 60.00th=[  124],
     | 70.00th=[  128], 80.00th=[  135], 90.00th=[  143], 95.00th=[  151],
     | 99.00th=[  172], 99.50th=[  190], 99.90th=[  676], 99.95th=[  717],
     | 99.99th=[ 8291]
   bw (  KiB/s): min=345344, max=609408, per=99.99%, avg=507869.41, stdev=38660.36, samples=37
   iops        : min= 5396, max= 9522, avg=7935.46, stdev=604.07, samples=37
  lat (usec)   : 100=17.66%, 250=81.97%, 500=0.20%, 750=0.13%, 1000=0.01%
  lat (msec)   : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.01%
  lat (msec)   : 250=0.01%
  cpu          : usr=4.25%, sys=24.31%, ctx=147465, majf=0, minf=13
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued rwts: total=0,147456,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
  WRITE: bw=496MiB/s (520MB/s), 496MiB/s-496MiB/s (520MB/s-520MB/s), io=9216MiB (9664MB), run=18580-18580msec

Disk stats (read/write):
    dm-1: ios=44/145633, merge=0/0, ticks=4472/13288, in_queue=17760, util=99.51%, aggrios=68/147623, aggrmerge=0/112, aggrticks=23896/14611, aggrin_queue=23996, aggrutil=99.45%
  sda: ios=68/147623, merge=0/112, ticks=23896/14611, in_queue=23996, util=99.45%

root@server:~# pveperf
CPU BOGOMIPS:      136020.20
REGEX/SECOND:      1262223
HD SIZE:           93.99 GB (/dev/mapper/pve-root)
BUFFERED READS:    452.26 MB/sec
AVERAGE SEEK TIME: 7.06 ms
FSYNCS/SECOND:     3824.85
DNS EXT:           29.03 ms

And the backups look like this:

INFO: starting new backup job: vzdump 103 --node server --storage NAS-1 --compress zstd --mode stop --remove 0
INFO: Starting Backup of VM 103 (qemu)
INFO: Backup started at 2022-03-12 11:35:45
INFO: status = stopped
INFO: backup mode: stop
INFO: ionice priority: 7
INFO: VM Name: ubuntuNagios
INFO: include disk 'sata0' 'local-lvm:vm-103-disk-0' 100G
INFO: creating vzdump archive '/mnt/pve/NAS-1/dump/vzdump-qemu-103-2022_03_12-11_35_45.vma.zst'
INFO: starting kvm to execute backup task
INFO: started backup task '347791da-510e-4018-ae09-f25185814d21'
INFO:   0% (337.1 MiB of 100.0 GiB) in 3s, read: 112.4 MiB/s, write: 37.8 MiB/s
INFO:   1% (1.2 GiB of 100.0 GiB) in 6s, read: 286.4 MiB/s, write: 38.9 MiB/s
INFO:   2% (2.1 GiB of 100.0 GiB) in 12s, read: 163.7 MiB/s, write: 11.5 MiB/s
INFO:   4% (4.5 GiB of 100.0 GiB) in 15s, read: 818.4 MiB/s, write: 57.3 KiB/s
INFO:   5% (5.9 GiB of 100.0 GiB) in 18s, read: 481.9 MiB/s, write: 22.9 MiB/s
INFO:   6% (6.3 GiB of 100.0 GiB) in 21s, read: 138.2 MiB/s, write: 31.9 MiB/s
INFO:   7% (7.1 GiB of 100.0 GiB) in 27s, read: 124.2 MiB/s, write: 57.5 MiB/s
INFO:   8% (8.7 GiB of 100.0 GiB) in 30s, read: 543.7 MiB/s, write: 13.6 MiB/s
INFO:  10% (10.2 GiB of 100.0 GiB) in 33s, read: 516.0 MiB/s, write: 16.9 MiB/s
INFO:  11% (12.0 GiB of 100.0 GiB) in 36s, read: 607.3 MiB/s, write: 13.1 MiB/s
INFO:  13% (13.6 GiB of 100.0 GiB) in 39s, read: 562.9 MiB/s, write: 12.1 MiB/s
INFO:  15% (15.5 GiB of 100.0 GiB) in 42s, read: 660.6 MiB/s, write: 4.4 MiB/s
INFO:  18% (18.0 GiB of 100.0 GiB) in 45s, read: 852.6 MiB/s, write: 2.9 MiB/s
INFO:  20% (20.1 GiB of 100.0 GiB) in 48s, read: 715.2 MiB/s, write: 3.6 MiB/s
INFO:  22% (22.7 GiB of 100.0 GiB) in 51s, read: 883.0 MiB/s, write: 1.7 MiB/s
INFO:  25% (25.4 GiB of 100.0 GiB) in 54s, read: 927.2 MiB/s, write: 561.3 KiB/s
INFO:  28% (28.0 GiB of 100.0 GiB) in 57s, read: 885.8 MiB/s, write: 1.3 MiB/s
INFO:  30% (30.8 GiB of 100.0 GiB) in 1m, read: 947.5 MiB/s, write: 642.7 KiB/s
INFO:  32% (32.7 GiB of 100.0 GiB) in 1m 3s, read: 645.5 MiB/s, write: 4.2 MiB/s
INFO:  35% (35.3 GiB of 100.0 GiB) in 1m 6s, read: 879.4 MiB/s, write: 453.3 KiB/s
INFO:  37% (37.9 GiB of 100.0 GiB) in 1m 9s, read: 896.8 MiB/s, write: 12.0 KiB/s
INFO:  40% (40.4 GiB of 100.0 GiB) in 1m 12s, read: 864.0 MiB/s, write: 3.8 MiB/s
INFO:  42% (42.9 GiB of 100.0 GiB) in 1m 15s, read: 838.1 MiB/s, write: 20.0 KiB/s
INFO:  45% (45.3 GiB of 100.0 GiB) in 1m 18s, read: 818.0 MiB/s, write: 553.3 KiB/s
INFO:  47% (47.5 GiB of 100.0 GiB) in 1m 21s, read: 760.2 MiB/s, write: 1.3 KiB/s
INFO:  48% (48.3 GiB of 100.0 GiB) in 1m 24s, read: 279.1 MiB/s, write: 68.8 MiB/s
INFO:  49% (49.0 GiB of 100.0 GiB) in 1m 28s, read: 182.7 MiB/s, write: 76.4 MiB/s
INFO:  51% (51.2 GiB of 100.0 GiB) in 1m 31s, read: 733.5 MiB/s, write: 5.3 KiB/s
INFO:  53% (53.6 GiB of 100.0 GiB) in 1m 34s, read: 819.5 MiB/s, write: 38.7 KiB/s
INFO:  56% (56.3 GiB of 100.0 GiB) in 1m 37s, read: 919.9 MiB/s, write: 3.7 MiB/s
INFO:  59% (59.3 GiB of 100.0 GiB) in 1m 40s, read: 1.0 GiB/s, write: 1.3 KiB/s
INFO:  62% (62.0 GiB of 100.0 GiB) in 1m 43s, read: 925.1 MiB/s, write: 10.7 KiB/s
INFO:  63% (63.2 GiB of 100.0 GiB) in 1m 50s, read: 181.8 MiB/s, write: 28.5 MiB/s
INFO:  64% (64.2 GiB of 100.0 GiB) in 1m 53s, read: 337.6 MiB/s, write: 27.0 MiB/s
INFO:  65% (65.3 GiB of 100.0 GiB) in 1m 56s, read: 360.4 MiB/s, write: 40.6 MiB/s
INFO:  66% (66.3 GiB of 100.0 GiB) in 1m 59s, read: 357.0 MiB/s, write: 19.9 MiB/s
INFO:  68% (68.2 GiB of 100.0 GiB) in 2m 2s, read: 620.2 MiB/s, write: 7.8 MiB/s
INFO:  69% (69.3 GiB of 100.0 GiB) in 2m 5s, read: 408.4 MiB/s, write: 25.4 MiB/s
INFO:  70% (70.3 GiB of 100.0 GiB) in 2m 8s, read: 317.5 MiB/s, write: 29.7 MiB/s
INFO:  72% (72.2 GiB of 100.0 GiB) in 2m 11s, read: 640.2 MiB/s, write: 9.0 MiB/s
INFO:  74% (74.0 GiB of 100.0 GiB) in 2m 14s, read: 633.6 MiB/s, write: 8.1 MiB/s
INFO:  75% (75.5 GiB of 100.0 GiB) in 2m 17s, read: 500.2 MiB/s, write: 18.0 MiB/s
INFO:  76% (76.2 GiB of 100.0 GiB) in 2m 20s, read: 239.3 MiB/s, write: 16.8 MiB/s
INFO:  77% (77.4 GiB of 100.0 GiB) in 2m 23s, read: 421.0 MiB/s, write: 23.6 MiB/s
INFO:  78% (78.2 GiB of 100.0 GiB) in 2m 26s, read: 271.6 MiB/s, write: 22.9 MiB/s
INFO:  80% (80.0 GiB of 100.0 GiB) in 2m 29s, read: 624.5 MiB/s, write: 15.6 MiB/s
INFO:  81% (81.9 GiB of 100.0 GiB) in 2m 32s, read: 626.2 MiB/s, write: 12.1 MiB/s
INFO:  82% (82.9 GiB of 100.0 GiB) in 2m 35s, read: 359.3 MiB/s, write: 21.8 MiB/s
INFO:  84% (84.9 GiB of 100.0 GiB) in 2m 38s, read: 681.8 MiB/s, write: 5.5 MiB/s
INFO:  86% (86.2 GiB of 100.0 GiB) in 2m 41s, read: 444.0 MiB/s, write: 10.8 MiB/s
INFO:  87% (87.0 GiB of 100.0 GiB) in 2m 48s, read: 115.3 MiB/s, write: 48.6 MiB/s
INFO:  88% (88.2 GiB of 100.0 GiB) in 2m 51s, read: 400.7 MiB/s, write: 25.1 MiB/s
INFO:  89% (89.7 GiB of 100.0 GiB) in 3m 2s, read: 145.0 MiB/s, write: 47.7 MiB/s
INFO:  90% (90.4 GiB of 100.0 GiB) in 3m 5s, read: 212.8 MiB/s, write: 17.7 MiB/s
INFO:  91% (91.1 GiB of 100.0 GiB) in 3m 10s, read: 151.8 MiB/s, write: 28.0 MiB/s
INFO:  92% (92.0 GiB of 100.0 GiB) in 3m 21s, read: 83.4 MiB/s, write: 55.9 MiB/s
INFO:  93% (93.0 GiB of 100.0 GiB) in 3m 36s, read: 70.6 MiB/s, write: 48.4 MiB/s
INFO:  94% (94.1 GiB of 100.0 GiB) in 3m 50s, read: 74.2 MiB/s, write: 57.6 MiB/s
INFO:  95% (95.0 GiB of 100.0 GiB) in 4m 5s, read: 64.9 MiB/s, write: 50.5 MiB/s
INFO:  96% (96.0 GiB of 100.0 GiB) in 4m 22s, read: 62.2 MiB/s, write: 52.8 MiB/s
INFO:  97% (97.0 GiB of 100.0 GiB) in 4m 33s, read: 91.2 MiB/s, write: 61.1 MiB/s
INFO:  98% (98.0 GiB of 100.0 GiB) in 4m 44s, read: 95.3 MiB/s, write: 64.6 MiB/s
INFO:  99% (99.2 GiB of 100.0 GiB) in 4m 50s, read: 198.9 MiB/s, write: 50.3 MiB/s
INFO: 100% (100.0 GiB of 100.0 GiB) in 4m 52s, read: 408.6 MiB/s, write: 4.0 KiB/s
INFO: backup is sparse: 90.88 GiB (90%) total zero data
INFO: transferred 100.00 GiB in 292 seconds (350.7 MiB/s)
INFO: stopping kvm after backup task
INFO: archive file size: 2.16GB
INFO: Finished Backup of VM 103 (00:04:56)
INFO: Backup finished at 2022-03-12 11:40:41
INFO: Backup job finished successfully
TASK OK

I don't see usage on server when it works.. any ideea what can be wrong?

 

[pushtius1]

and with no compression

INFO: starting new backup job: vzdump 103 --node server --storage NAS-1 --remove 0 --mode stop --compress 0
INFO: Starting Backup of VM 103 (qemu)
INFO: Backup started at 2022-03-12 11:22:50
INFO: status = stopped
INFO: backup mode: stop
INFO: ionice priority: 7
INFO: VM Name: ubuntuNagios
INFO: include disk 'sata0' 'local-lvm:vm-103-disk-0' 100G
INFO: creating vzdump archive '/mnt/pve/NAS-1/dump/vzdump-qemu-103-2022_03_12-11_22_50.vma'
INFO: starting kvm to execute backup task
INFO: started backup task 'e0239fc8-d643-4500-8e7a-1c0bd55c8c89'
INFO:   0% (570.2 MiB of 100.0 GiB) in 3s, read: 190.1 MiB/s, write: 59.0 MiB/s
INFO:   1% (1.2 GiB of 100.0 GiB) in 6s, read: 215.8 MiB/s, write: 24.7 MiB/s
INFO:   2% (2.1 GiB of 100.0 GiB) in 10s, read: 233.4 MiB/s, write: 12.1 MiB/s
INFO:   4% (4.2 GiB of 100.0 GiB) in 13s, read: 711.3 MiB/s, write: 57.3 KiB/s
INFO:   5% (5.9 GiB of 100.0 GiB) in 16s, read: 573.4 MiB/s, write: 15.8 MiB/s
INFO:   6% (6.4 GiB of 100.0 GiB) in 19s, read: 176.0 MiB/s, write: 41.7 MiB/s
INFO:   7% (7.3 GiB of 100.0 GiB) in 23s, read: 244.8 MiB/s, write: 87.1 MiB/s
INFO:   9% (9.1 GiB of 100.0 GiB) in 26s, read: 614.9 MiB/s, write: 9.8 MiB/s
INFO:  10% (10.6 GiB of 100.0 GiB) in 29s, read: 494.5 MiB/s, write: 30.0 MiB/s
INFO:  12% (12.4 GiB of 100.0 GiB) in 32s, read: 618.8 MiB/s, write: 12.1 MiB/s
INFO:  14% (14.1 GiB of 100.0 GiB) in 41s, read: 192.2 MiB/s, write: 591.6 KiB/s
INFO:  16% (16.1 GiB of 100.0 GiB) in 44s, read: 688.2 MiB/s, write: 4.4 MiB/s
INFO:  18% (18.0 GiB of 100.0 GiB) in 47s, read: 659.5 MiB/s, write: 1.5 MiB/s
INFO:  20% (20.0 GiB of 100.0 GiB) in 50s, read: 670.8 MiB/s, write: 493.3 KiB/s
INFO:  21% (21.5 GiB of 100.0 GiB) in 53s, read: 509.5 MiB/s, write: 4.0 MiB/s
INFO:  23% (23.6 GiB of 100.0 GiB) in 56s, read: 703.6 MiB/s, write: 333.3 KiB/s
INFO:  25% (25.6 GiB of 100.0 GiB) in 59s, read: 713.0 MiB/s, write: 561.3 KiB/s
INFO:  27% (27.8 GiB of 100.0 GiB) in 1m 2s, read: 725.2 MiB/s, write: 680.0 KiB/s
INFO:  29% (29.8 GiB of 100.0 GiB) in 1m 5s, read: 694.4 MiB/s, write: 754.7 KiB/s
INFO:  32% (32.1 GiB of 100.0 GiB) in 1m 8s, read: 794.4 MiB/s, write: 3.1 MiB/s
INFO:  34% (34.8 GiB of 100.0 GiB) in 1m 11s, read: 894.5 MiB/s, write: 2.2 MiB/s
INFO:  37% (37.1 GiB of 100.0 GiB) in 1m 14s, read: 787.8 MiB/s, write: 12.0 KiB/s
INFO:  39% (39.2 GiB of 100.0 GiB) in 1m 17s, read: 741.5 MiB/s, write: 1.3 KiB/s
INFO:  41% (41.6 GiB of 100.0 GiB) in 1m 20s, read: 818.2 MiB/s, write: 3.8 MiB/s
INFO:  44% (44.0 GiB of 100.0 GiB) in 1m 23s, read: 817.3 MiB/s, write: 50.7 KiB/s
INFO:  46% (46.3 GiB of 100.0 GiB) in 1m 26s, read: 760.0 MiB/s, write: 524.0 KiB/s
INFO:  48% (48.3 GiB of 100.0 GiB) in 1m 29s, read: 692.3 MiB/s, write: 51.6 MiB/s
INFO:  49% (49.1 GiB of 100.0 GiB) in 1m 32s, read: 285.8 MiB/s, write: 119.0 MiB/s
INFO:  51% (51.9 GiB of 100.0 GiB) in 1m 35s, read: 937.8 MiB/s, write: 5.3 KiB/s
INFO:  52% (52.9 GiB of 100.0 GiB) in 1m 41s, read: 176.7 MiB/s, write: 19.3 KiB/s
INFO:  54% (55.0 GiB of 100.0 GiB) in 1m 44s, read: 713.4 MiB/s, write: 3.7 MiB/s
INFO:  57% (57.3 GiB of 100.0 GiB) in 1m 47s, read: 797.1 MiB/s, write: 5.3 KiB/s
INFO:  59% (59.6 GiB of 100.0 GiB) in 1m 50s, read: 790.5 MiB/s, write: 1.3 KiB/s
INFO:  62% (62.0 GiB of 100.0 GiB) in 1m 53s, read: 806.6 MiB/s, write: 36.0 KiB/s
INFO:  63% (63.9 GiB of 100.0 GiB) in 2m, read: 271.5 MiB/s, write: 28.5 MiB/s
INFO:  64% (64.2 GiB of 100.0 GiB) in 2m 3s, read: 112.8 MiB/s, write: 15.3 MiB/s
INFO:  65% (65.6 GiB of 100.0 GiB) in 2m 6s, read: 485.9 MiB/s, write: 52.2 MiB/s
INFO:  66% (66.2 GiB of 100.0 GiB) in 2m 9s, read: 191.8 MiB/s, write: 15.6 MiB/s
INFO:  68% (68.0 GiB of 100.0 GiB) in 2m 12s, read: 636.0 MiB/s, write: 6.9 MiB/s
INFO:  69% (69.1 GiB of 100.0 GiB) in 2m 15s, read: 357.6 MiB/s, write: 30.5 MiB/s
INFO:  70% (70.2 GiB of 100.0 GiB) in 2m 18s, read: 379.2 MiB/s, write: 14.2 MiB/s
INFO:  72% (72.0 GiB of 100.0 GiB) in 2m 21s, read: 628.6 MiB/s, write: 17.2 MiB/s
INFO:  73% (74.0 GiB of 100.0 GiB) in 2m 25s, read: 498.2 MiB/s, write: 10.9 MiB/s
INFO:  74% (74.8 GiB of 100.0 GiB) in 2m 28s, read: 284.6 MiB/s, write: 18.7 MiB/s
INFO:  76% (76.1 GiB of 100.0 GiB) in 2m 31s, read: 451.9 MiB/s, write: 7.0 MiB/s
INFO:  77% (77.3 GiB of 100.0 GiB) in 2m 34s, read: 386.6 MiB/s, write: 33.4 MiB/s
INFO:  78% (78.2 GiB of 100.0 GiB) in 2m 37s, read: 324.3 MiB/s, write: 26.9 MiB/s
INFO:  80% (80.0 GiB of 100.0 GiB) in 2m 40s, read: 612.9 MiB/s, write: 10.8 MiB/s
INFO:  81% (81.1 GiB of 100.0 GiB) in 2m 43s, read: 384.6 MiB/s, write: 13.0 MiB/s
INFO:  82% (82.6 GiB of 100.0 GiB) in 2m 46s, read: 484.0 MiB/s, write: 21.8 MiB/s
INFO:  84% (84.0 GiB of 100.0 GiB) in 2m 49s, read: 498.8 MiB/s, write: 438.7 KiB/s
INFO:  86% (86.0 GiB of 100.0 GiB) in 2m 52s, read: 686.4 MiB/s, write: 6.4 MiB/s
INFO:  87% (87.0 GiB of 100.0 GiB) in 2m 59s, read: 146.9 MiB/s, write: 55.4 MiB/s
INFO:  88% (88.2 GiB of 100.0 GiB) in 3m 2s, read: 398.9 MiB/s, write: 23.3 MiB/s
INFO:  89% (89.1 GiB of 100.0 GiB) in 3m 8s, read: 156.7 MiB/s, write: 85.2 MiB/s
INFO:  90% (90.3 GiB of 100.0 GiB) in 3m 11s, read: 414.3 MiB/s, write: 17.1 MiB/s
INFO:  91% (91.0 GiB of 100.0 GiB) in 3m 15s, read: 180.0 MiB/s, write: 29.5 MiB/s
INFO:  92% (92.2 GiB of 100.0 GiB) in 3m 38s, read: 49.8 MiB/s, write: 29.6 MiB/s
INFO:  93% (93.1 GiB of 100.0 GiB) in 3m 52s, read: 66.4 MiB/s, write: 51.3 MiB/s
INFO:  94% (94.1 GiB of 100.0 GiB) in 4m 1s, read: 114.5 MiB/s, write: 87.9 MiB/s
INFO:  95% (95.1 GiB of 100.0 GiB) in 4m 12s, read: 92.1 MiB/s, write: 72.9 MiB/s
INFO:  96% (96.0 GiB of 100.0 GiB) in 4m 46s, read: 28.5 MiB/s, write: 24.5 MiB/s
INFO:  97% (97.0 GiB of 100.0 GiB) in 4m 54s, read: 132.6 MiB/s, write: 87.7 MiB/s
INFO:  98% (98.2 GiB of 100.0 GiB) in 5m 6s, read: 94.5 MiB/s, write: 58.4 MiB/s
INFO:  99% (99.3 GiB of 100.0 GiB) in 5m 10s, read: 285.5 MiB/s, write: 70.4 MiB/s
INFO: 100% (100.0 GiB of 100.0 GiB) in 5m 18s, read: 93.1 MiB/s, write: 1.0 KiB/s
INFO: backup is sparse: 90.88 GiB (90%) total zero data
INFO: transferred 100.00 GiB in 318 seconds (322.0 MiB/s)
INFO: stopping kvm after backup task
INFO: archive file size: 9.13GB
INFO: Finished Backup of VM 103 (00:05:20)
INFO: Backup finished at 2022-03-12 11:28:10
INFO: Backup job finished successfully
TASK OK

 

[pushtius1]

root@server:~# pveversion
pve-manager/6.4-13/9f411e79 (running kernel: 5.4.174-2-pve)
root@server:~# pveversion -v
proxmox-ve: 6.4-1 (running kernel: 5.4.174-2-pve)
pve-manager: 6.4-13 (running version: 6.4-13/9f411e79)
pve-kernel-5.4: 6.4-15
pve-kernel-helper: 6.4-15
pve-kernel-5.3: 6.1-6
pve-kernel-5.4.174-2-pve: 5.4.174-2
pve-kernel-5.3.18-3-pve: 5.3.18-3
pve-kernel-5.3.10-1-pve: 5.3.10-1
ceph-fuse: 12.2.11+dfsg1-2.1+b1
corosync: 3.1.5-pve2~bpo10+1
criu: 3.11-3
glusterfs-client: 5.5-3
ifupdown: residual config
ifupdown2: 3.0.0-1+pve4~bpo10
ksm-control-daemon: 1.3-1
libjs-extjs: 6.0.1-10
libknet1: 1.22-pve2~bpo10+1
libproxmox-acme-perl: 1.1.0
libproxmox-backup-qemu0: 1.1.0-1
libpve-access-control: 6.4-3
libpve-apiclient-perl: 3.1-3
libpve-common-perl: 6.4-4
libpve-guest-common-perl: 3.1-5
libpve-http-server-perl: 3.2-3
libpve-storage-perl: 6.4-1
libqb0: 1.0.5-1
libspice-server1: 0.14.2-4~pve6+1
lvm2: 2.03.02-pve4
lxc-pve: 4.0.6-2
lxcfs: 4.0.6-pve1
novnc-pve: 1.1.0-1
proxmox-backup-client: 1.1.13-2
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.6-1
pve-cluster: 6.4-1
pve-container: 3.3-6
pve-docs: 6.4-2
pve-edk2-firmware: 2.20200531-1
pve-firewall: 4.1-4
pve-firmware: 3.3-2
pve-ha-manager: 3.1-1
pve-i18n: 2.3-1
pve-qemu-kvm: 5.2.0-6
pve-xtermjs: 4.7.0-3
qemu-server: 6.4-2
smartmontools: 7.2-pve2
spiceterm: 3.1-1
vncterm: 1.6-2
zfsutils-linux: 2.0.7-pve1

 

[Dunuin]

Look fine to me. 100GiB backed up in 4:52 is an average speed of 342 MiB/s. Vzdump always needs to read the complete virtual disk, no matter how full that virtual disk is. If you want faster backups try PBS with "snapshot" mode instead of Vzdump so it can make use of dirty bitmapping and olny needs to read/backup the data that changed since the previos backup. That also saves a ton of space because of deduplication.