Slow Backup Transfer Speeds between Nodes and PBS

[helojunkie]

We have three Dell R640 servers; all NVMe-backed zfs storage, 1TB RAM each, 100G main interface, and 10G dedicated Corosync interface, all connected to Cisco Nexux 9k switches. Our PBS is also a Dell R640, 100% NVMe backed storage (RAIDZ2), 256GB RAM, 100G main interface only.

Running iperf3 in parallel, I can almost totally saturate the 100G links between the cluster nodes and the proxmox backup server.

But I consistently see terrible network transfer times for my backups and different backup times based on the VM:

137: 2024-02-18 10:02:15 INFO: transferred 60.00 GiB in 96 seconds (640.0 MiB/s)
137: 2024-02-18 10:17:21 INFO: transferred 60.00 GiB in 101 seconds (608.3 MiB/s)


144: 2024-02-18 10:10:42 INFO: transferred 53.64 GiB in 480 seconds (114.4 MiB/s)
144: 2024-02-18 11:14:08 INFO: transferred 92.70 GiB in 836 seconds (113.6 MiB/s)
144: 2024-02-18 11:25:08 INFO: transferred 66.81 GiB in 605 seconds (113.1 MiB/s)

Outside of Proxmox, we have a LOT of 10G and 100G connected servers including almost 14PiB hosted on multiple TrueNAS Scale systems and I have no issues with throughput during replication on those systems, so I am pretty sure my issue is not network related, but this is my first Proxmox Backup server so I am not sure if this is normal, or if I should be looking for other problems or ways to tune these systems.

Thanks for any advice!

 

[_gabriel]

transferred data is only the new data,
what about total size ?

PBS will new read all source if the "dirty map" is new ("dirty bitmap is new each time the VM is restarded).

 

[helojunkie]

transferred data is only the new data,
what about total size ?

PBS will new read all source if the "dirty map" is new ("dirty bitmap is new each time the VM is restarded).

Hi _gabriel

In these examples, 137 is 60GiB (and not even running at all), and 144 is 300GiB and has not been rebooted in weeks.

 

[_gabriel]

a full log will help.

edit: for 137, numbers seems good.
PBS can't be fast as vzdump, because of dedup+compression+aes

 

[helojunkie]

vzdump 100 105 106 107 108 110 112 113 118 120 142 143 144 --mailnotification failure --storage ProxBackup01 --notes-template '{{guestname}}' --mode snapshot --all 0 --node proxmox02


144: 2024-02-18 11:15:02 INFO: Starting Backup of VM 144 (qemu)
144: 2024-02-18 11:15:02 INFO: status = running
144: 2024-02-18 11:15:02 INFO: VM Name: Grandmaster
144: 2024-02-18 11:15:02 INFO: include disk 'scsi0' 'ssdimages:vm-144-disk-0' 300G
144: 2024-02-18 11:15:02 INFO: backup mode: snapshot
144: 2024-02-18 11:15:02 INFO: ionice priority: 7
144: 2024-02-18 11:15:02 INFO: snapshots found (not included into backup)
144: 2024-02-18 11:15:02 INFO: creating Proxmox Backup Server archive 'vm/144/2024-02-18T19:15:02Z'
144: 2024-02-18 11:15:02 INFO: issuing guest-agent 'fs-freeze' command
144: 2024-02-18 11:15:03 INFO: issuing guest-agent 'fs-thaw' command
144: 2024-02-18 11:15:03 INFO: started backup task '4706eef5-b7d1-4e0c-bd6e-29f0bf88356b'
144: 2024-02-18 11:15:03 INFO: resuming VM again
144: 2024-02-18 11:15:03 INFO: scsi0: dirty-bitmap status: OK (66.8 GiB of 300.0 GiB dirty)
144: 2024-02-18 11:15:03 INFO: using fast incremental mode (dirty-bitmap), 66.8 GiB dirty of 300.0 GiB total
144: 2024-02-18 11:15:06 INFO:   0% (368.0 MiB of 66.8 GiB) in 3s, read: 122.7 MiB/s, write: 121.3 MiB/s
144: 2024-02-18 11:15:09 INFO:   1% (728.0 MiB of 66.8 GiB) in 6s, read: 120.0 MiB/s, write: 120.0 MiB/s
144: 2024-02-18 11:15:15 INFO:   2% (1.4 GiB of 66.8 GiB) in 12s, read: 116.0 MiB/s, write: 116.0 MiB/s
144: 2024-02-18 11:15:21 INFO:   3% (2.1 GiB of 66.8 GiB) in 18s, read: 118.0 MiB/s, write: 117.3 MiB/s
144: 2024-02-18 11:15:27 INFO:   4% (2.8 GiB of 66.8 GiB) in 24s, read: 118.7 MiB/s, write: 118.7 MiB/s
144: 2024-02-18 11:15:33 INFO:   5% (3.5 GiB of 66.8 GiB) in 30s, read: 115.3 MiB/s, write: 115.3 MiB/s
144: 2024-02-18 11:15:38 INFO:   6% (4.0 GiB of 66.8 GiB) in 35s, read: 115.2 MiB/s, write: 114.4 MiB/s
144: 2024-02-18 11:15:44 INFO:   7% (4.7 GiB of 66.8 GiB) in 41s, read: 113.3 MiB/s, write: 113.3 MiB/s
144: 2024-02-18 11:15:51 INFO:   8% (5.5 GiB of 66.8 GiB) in 48s, read: 114.3 MiB/s, write: 114.3 MiB/s
144: 2024-02-18 11:15:56 INFO:   9% (6.0 GiB of 66.8 GiB) in 53s, read: 113.6 MiB/s, write: 113.6 MiB/s
144: 2024-02-18 11:16:03 INFO:  10% (6.7 GiB of 66.8 GiB) in 1m, read: 98.9 MiB/s, write: 98.3 MiB/s
144: 2024-02-18 11:16:10 INFO:  11% (7.4 GiB of 66.8 GiB) in 1m 7s, read: 107.4 MiB/s, write: 107.4 MiB/s
144: 2024-02-18 11:16:16 INFO:  12% (8.1 GiB of 66.8 GiB) in 1m 13s, read: 109.3 MiB/s, write: 108.0 MiB/s
144: 2024-02-18 11:16:22 INFO:  13% (8.7 GiB of 66.8 GiB) in 1m 19s, read: 110.7 MiB/s, write: 108.0 MiB/s
144: 2024-02-18 11:16:28 INFO:  14% (9.4 GiB of 66.8 GiB) in 1m 25s, read: 112.7 MiB/s, write: 112.0 MiB/s
144: 2024-02-18 11:16:34 INFO:  15% (10.1 GiB of 66.8 GiB) in 1m 31s, read: 126.7 MiB/s, write: 126.7 MiB/s
144: 2024-02-18 11:16:39 INFO:  16% (10.8 GiB of 66.8 GiB) in 1m 36s, read: 130.4 MiB/s, write: 128.8 MiB/s
144: 2024-02-18 11:16:45 INFO:  17% (11.4 GiB of 66.8 GiB) in 1m 42s, read: 116.7 MiB/s, write: 116.7 MiB/s
144: 2024-02-18 11:16:51 INFO:  18% (12.1 GiB of 66.8 GiB) in 1m 48s, read: 114.0 MiB/s, write: 113.3 MiB/s
144: 2024-02-18 11:16:56 INFO:  19% (12.7 GiB of 66.8 GiB) in 1m 53s, read: 121.6 MiB/s, write: 120.8 MiB/s
144: 2024-02-18 11:17:02 INFO:  20% (13.4 GiB of 66.8 GiB) in 1m 59s, read: 119.3 MiB/s, write: 118.7 MiB/s
144: 2024-02-18 11:17:08 INFO:  21% (14.1 GiB of 66.8 GiB) in 2m 5s, read: 121.3 MiB/s, write: 118.0 MiB/s
144: 2024-02-18 11:17:14 INFO:  22% (14.8 GiB of 66.8 GiB) in 2m 11s, read: 111.3 MiB/s, write: 110.0 MiB/s
144: 2024-02-18 11:17:20 INFO:  23% (15.4 GiB of 66.8 GiB) in 2m 17s, read: 110.7 MiB/s, write: 110.0 MiB/s
144: 2024-02-18 11:17:26 INFO:  24% (16.1 GiB of 66.8 GiB) in 2m 23s, read: 112.7 MiB/s, write: 110.7 MiB/s
144: 2024-02-18 11:17:32 INFO:  25% (16.8 GiB of 66.8 GiB) in 2m 29s, read: 128.0 MiB/s, write: 126.7 MiB/s
144: 2024-02-18 11:17:37 INFO:  26% (17.4 GiB of 66.8 GiB) in 2m 34s, read: 124.8 MiB/s, write: 124.8 MiB/s
144: 2024-02-18 11:17:44 INFO:  27% (18.1 GiB of 66.8 GiB) in 2m 41s, read: 99.4 MiB/s, write: 98.9 MiB/s
144: 2024-02-18 11:17:50 INFO:  28% (18.8 GiB of 66.8 GiB) in 2m 47s, read: 116.0 MiB/s, write: 116.0 MiB/s
144: 2024-02-18 11:17:56 INFO:  29% (19.5 GiB of 66.8 GiB) in 2m 53s, read: 116.7 MiB/s, write: 116.0 MiB/s
144: 2024-02-18 11:18:01 INFO:  30% (20.1 GiB of 66.8 GiB) in 2m 58s, read: 119.2 MiB/s, write: 119.2 MiB/s
144: 2024-02-18 11:18:07 INFO:  31% (20.7 GiB of 66.8 GiB) in 3m 4s, read: 116.0 MiB/s, write: 116.0 MiB/s
144: 2024-02-18 11:18:14 INFO:  32% (21.5 GiB of 66.8 GiB) in 3m 11s, read: 108.0 MiB/s, write: 106.9 MiB/s
144: 2024-02-18 11:18:20 INFO:  33% (22.1 GiB of 66.8 GiB) in 3m 17s, read: 112.7 MiB/s, write: 112.7 MiB/s
144: 2024-02-18 11:18:26 INFO:  34% (22.8 GiB of 66.8 GiB) in 3m 23s, read: 120.7 MiB/s, write: 119.3 MiB/s
144: 2024-02-18 11:18:31 INFO:  35% (23.5 GiB of 66.8 GiB) in 3m 28s, read: 132.8 MiB/s, write: 132.8 MiB/s
144: 2024-02-18 11:18:36 INFO:  36% (24.1 GiB of 66.8 GiB) in 3m 33s, read: 128.8 MiB/s, write: 128.8 MiB/s
144: 2024-02-18 11:18:41 INFO:  37% (24.8 GiB of 66.8 GiB) in 3m 38s, read: 139.2 MiB/s, write: 138.4 MiB/s
144: 2024-02-18 11:18:47 INFO:  38% (25.5 GiB of 66.8 GiB) in 3m 44s, read: 120.0 MiB/s, write: 119.3 MiB/s
144: 2024-02-18 11:18:52 INFO:  39% (26.1 GiB of 66.8 GiB) in 3m 49s, read: 118.4 MiB/s, write: 117.6 MiB/s
144: 2024-02-18 11:18:58 INFO:  40% (26.8 GiB of 66.8 GiB) in 3m 55s, read: 118.0 MiB/s, write: 118.0 MiB/s
144: 2024-02-18 11:19:04 INFO:  41% (27.5 GiB of 66.8 GiB) in 4m 1s, read: 117.3 MiB/s, write: 117.3 MiB/s
144: 2024-02-18 11:19:10 INFO:  42% (28.1 GiB of 66.8 GiB) in 4m 7s, read: 114.7 MiB/s, write: 114.0 MiB/s
144: 2024-02-18 11:19:16 INFO:  43% (28.8 GiB of 66.8 GiB) in 4m 13s, read: 114.7 MiB/s, write: 112.7 MiB/s
144: 2024-02-18 11:19:23 INFO:  44% (29.5 GiB of 66.8 GiB) in 4m 20s, read: 102.3 MiB/s, write: 101.1 MiB/s
144: 2024-02-18 11:19:29 INFO:  45% (30.2 GiB of 66.8 GiB) in 4m 26s, read: 113.3 MiB/s, write: 113.3 MiB/s
144: 2024-02-18 11:19:35 INFO:  46% (30.8 GiB of 66.8 GiB) in 4m 32s, read: 111.3 MiB/s, write: 109.3 MiB/s
144: 2024-02-18 11:19:41 INFO:  47% (31.5 GiB of 66.8 GiB) in 4m 38s, read: 112.0 MiB/s, write: 111.3 MiB/s
144: 2024-02-18 11:19:47 INFO:  48% (32.1 GiB of 66.8 GiB) in 4m 44s, read: 110.0 MiB/s, write: 109.3 MiB/s
144: 2024-02-18 11:19:53 INFO:  49% (32.8 GiB of 66.8 GiB) in 4m 50s, read: 115.3 MiB/s, write: 112.0 MiB/s
144: 2024-02-18 11:19:59 INFO:  50% (33.5 GiB of 66.8 GiB) in 4m 56s, read: 114.0 MiB/s, write: 112.7 MiB/s
144: 2024-02-18 11:20:06 INFO:  51% (34.2 GiB of 66.8 GiB) in 5m 3s, read: 102.9 MiB/s, write: 102.3 MiB/s
144: 2024-02-18 11:20:12 INFO:  52% (34.8 GiB of 66.8 GiB) in 5m 9s, read: 102.0 MiB/s, write: 100.0 MiB/s
144: 2024-02-18 11:20:19 INFO:  53% (35.5 GiB of 66.8 GiB) in 5m 16s, read: 106.9 MiB/s, write: 105.1 MiB/s
144: 2024-02-18 11:20:25 INFO:  54% (36.1 GiB of 66.8 GiB) in 5m 22s, read: 104.7 MiB/s, write: 103.3 MiB/s
144: 2024-02-18 11:20:32 INFO:  55% (36.9 GiB of 66.8 GiB) in 5m 29s, read: 110.9 MiB/s, write: 109.1 MiB/s
144: 2024-02-18 11:20:37 INFO:  56% (37.5 GiB of 66.8 GiB) in 5m 34s, read: 121.6 MiB/s, write: 119.2 MiB/s
144: 2024-02-18 11:20:43 INFO:  57% (38.2 GiB of 66.8 GiB) in 5m 40s, read: 120.0 MiB/s, write: 118.7 MiB/s
144: 2024-02-18 11:20:49 INFO:  58% (38.8 GiB of 66.8 GiB) in 5m 46s, read: 108.7 MiB/s, write: 104.0 MiB/s
144: 2024-02-18 11:20:55 INFO:  59% (39.4 GiB of 66.8 GiB) in 5m 52s, read: 108.7 MiB/s, write: 107.3 MiB/s
144: 2024-02-18 11:21:03 INFO:  60% (40.1 GiB of 66.8 GiB) in 6m, read: 90.0 MiB/s, write: 89.5 MiB/s
144: 2024-02-18 11:21:09 INFO:  61% (40.8 GiB of 66.8 GiB) in 6m 6s, read: 105.3 MiB/s, write: 103.3 MiB/s
144: 2024-02-18 11:21:17 INFO:  62% (41.5 GiB of 66.8 GiB) in 6m 14s, read: 94.0 MiB/s, write: 93.0 MiB/s
144: 2024-02-18 11:21:23 INFO:  63% (42.1 GiB of 66.8 GiB) in 6m 20s, read: 105.3 MiB/s, write: 104.0 MiB/s
144: 2024-02-18 11:21:30 INFO:  64% (42.8 GiB of 66.8 GiB) in 6m 27s, read: 104.6 MiB/s, write: 104.0 MiB/s
144: 2024-02-18 11:21:36 INFO:  65% (43.4 GiB of 66.8 GiB) in 6m 33s, read: 104.0 MiB/s, write: 103.3 MiB/s
144: 2024-02-18 11:21:43 INFO:  66% (44.2 GiB of 66.8 GiB) in 6m 40s, read: 105.7 MiB/s, write: 104.0 MiB/s
144: 2024-02-18 11:21:50 INFO:  67% (44.9 GiB of 66.8 GiB) in 6m 47s, read: 104.0 MiB/s, write: 104.0 MiB/s
144: 2024-02-18 11:21:55 INFO:  68% (45.4 GiB of 66.8 GiB) in 6m 52s, read: 117.6 MiB/s, write: 117.6 MiB/s
144: 2024-02-18 11:22:02 INFO:  69% (46.2 GiB of 66.8 GiB) in 6m 59s, read: 109.1 MiB/s, write: 108.0 MiB/s
144: 2024-02-18 11:22:08 INFO:  70% (46.8 GiB of 66.8 GiB) in 7m 5s, read: 107.3 MiB/s, write: 106.7 MiB/s
144: 2024-02-18 11:22:14 INFO:  71% (47.5 GiB of 66.8 GiB) in 7m 11s, read: 110.0 MiB/s, write: 109.3 MiB/s
144: 2024-02-18 11:22:20 INFO:  72% (48.1 GiB of 66.8 GiB) in 7m 17s, read: 118.0 MiB/s, write: 117.3 MiB/s
144: 2024-02-18 11:22:26 INFO:  73% (48.8 GiB of 66.8 GiB) in 7m 23s, read: 116.0 MiB/s, write: 115.3 MiB/s
144: 2024-02-18 11:22:32 INFO:  74% (49.5 GiB of 66.8 GiB) in 7m 29s, read: 107.3 MiB/s, write: 106.7 MiB/s
144: 2024-02-18 11:22:40 INFO:  75% (50.2 GiB of 66.8 GiB) in 7m 37s, read: 91.0 MiB/s, write: 91.0 MiB/s
144: 2024-02-18 11:22:48 INFO:  76% (50.8 GiB of 66.8 GiB) in 7m 45s, read: 81.5 MiB/s, write: 80.5 MiB/s
144: 2024-02-18 11:22:55 INFO:  77% (51.5 GiB of 66.8 GiB) in 7m 52s, read: 106.3 MiB/s, write: 105.1 MiB/s
144: 2024-02-18 11:23:01 INFO:  78% (52.2 GiB of 66.8 GiB) in 7m 58s, read: 106.0 MiB/s, write: 104.7 MiB/s
144: 2024-02-18 11:23:07 INFO:  79% (52.8 GiB of 66.8 GiB) in 8m 4s, read: 112.7 MiB/s, write: 112.0 MiB/s
144: 2024-02-18 11:23:13 INFO:  80% (53.5 GiB of 66.8 GiB) in 8m 10s, read: 120.0 MiB/s, write: 118.7 MiB/s
144: 2024-02-18 11:23:19 INFO:  81% (54.1 GiB of 66.8 GiB) in 8m 16s, read: 105.3 MiB/s, write: 104.7 MiB/s
144: 2024-02-18 11:23:26 INFO:  82% (54.9 GiB of 66.8 GiB) in 8m 23s, read: 109.7 MiB/s, write: 108.0 MiB/s
144: 2024-02-18 11:23:32 INFO:  83% (55.5 GiB of 66.8 GiB) in 8m 29s, read: 104.7 MiB/s, write: 102.7 MiB/s
144: 2024-02-18 11:23:38 INFO:  84% (56.2 GiB of 66.8 GiB) in 8m 35s, read: 112.0 MiB/s, write: 112.0 MiB/s
144: 2024-02-18 11:23:45 INFO:  85% (56.9 GiB of 66.8 GiB) in 8m 42s, read: 105.7 MiB/s, write: 104.6 MiB/s
144: 2024-02-18 11:23:51 INFO:  86% (57.5 GiB of 66.8 GiB) in 8m 48s, read: 110.7 MiB/s, write: 110.7 MiB/s
144: 2024-02-18 11:23:57 INFO:  87% (58.2 GiB of 66.8 GiB) in 8m 54s, read: 107.3 MiB/s, write: 104.7 MiB/s
144: 2024-02-18 11:24:02 INFO:  88% (58.8 GiB of 66.8 GiB) in 8m 59s, read: 140.8 MiB/s, write: 140.8 MiB/s
144: 2024-02-18 11:24:07 INFO:  89% (59.6 GiB of 66.8 GiB) in 9m 4s, read: 148.0 MiB/s, write: 146.4 MiB/s
144: 2024-02-18 11:24:11 INFO:  90% (60.1 GiB of 66.8 GiB) in 9m 8s, read: 145.0 MiB/s, write: 145.0 MiB/s
144: 2024-02-18 11:24:17 INFO:  91% (60.8 GiB of 66.8 GiB) in 9m 14s, read: 121.3 MiB/s, write: 121.3 MiB/s
144: 2024-02-18 11:24:22 INFO:  92% (61.5 GiB of 66.8 GiB) in 9m 19s, read: 144.8 MiB/s, write: 143.2 MiB/s
144: 2024-02-18 11:24:26 INFO:  93% (62.2 GiB of 66.8 GiB) in 9m 23s, read: 156.0 MiB/s, write: 156.0 MiB/s
144: 2024-02-18 11:24:31 INFO:  94% (62.9 GiB of 66.8 GiB) in 9m 28s, read: 152.0 MiB/s, write: 152.0 MiB/s
144: 2024-02-18 11:24:36 INFO:  95% (63.6 GiB of 66.8 GiB) in 9m 33s, read: 136.0 MiB/s, write: 135.2 MiB/s
144: 2024-02-18 11:24:41 INFO:  96% (64.1 GiB of 66.8 GiB) in 9m 38s, read: 119.2 MiB/s, write: 117.6 MiB/s
144: 2024-02-18 11:24:47 INFO:  97% (64.8 GiB of 66.8 GiB) in 9m 44s, read: 120.0 MiB/s, write: 118.0 MiB/s
144: 2024-02-18 11:24:53 INFO:  98% (65.5 GiB of 66.8 GiB) in 9m 50s, read: 118.7 MiB/s, write: 116.0 MiB/s
144: 2024-02-18 11:24:59 INFO:  99% (66.2 GiB of 66.8 GiB) in 9m 56s, read: 119.3 MiB/s, write: 118.7 MiB/s
144: 2024-02-18 11:25:04 INFO: 100% (66.8 GiB of 66.8 GiB) in 10m 1s, read: 116.0 MiB/s, write: 114.4 MiB/s
144: 2024-02-18 11:25:04 INFO: Waiting for server to finish backup validation...
144: 2024-02-18 11:25:08 INFO: backup was done incrementally, reused 233.74 GiB (77%)
144: 2024-02-18 11:25:08 INFO: transferred 66.81 GiB in 605 seconds (113.1 MiB/s)
144: 2024-02-18 11:25:08 INFO: adding notes to backup
144: 2024-02-18 11:25:08 INFO: Finished Backup of VM 144 (00:10:06)

 

[_gabriel]

no others jobs running on PBS ?
like, GC or Verification or Sync ?
then I would cross-tests.
on plain ext4 datastore on dedicated nvme drive.

edit: seems backups are overlapped, isn't it ?
try one VM backup alone.
What ssd model ? are enterprise ?

 

[helojunkie]

These are all brand-new DellEMC 4TB NVMe Enterprise P4510 drives installed in new servers. The nodes have 2 vdevs each, with each vdev being 2 x 4TB drives mirrored. The PBS has 8 of those same drives but in a RAIDZ2 configuration.

No GC or verification running at the time of these tests. There were no overlapping backups running; the 144 above was the only backup running at the time it was done.


I did some FIO testing on the PBS server and here are the results:

root@proxbackup01:~# ./FIO_Speed_Test.sh /mnt/datastore/ssd-zfs/test/
Running randwrite test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /mnt/datastore/ssd-zfs/test/
Average Write IOPS: 8,131.29
Average Write Bandwidth (MB/s): 8,131.29
Running randread test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /mnt/datastore/ssd-zfs/test/
Average Read IOPS: 15,008.78
Average Read Bandwidth (MB/s): 15,008.78
Running write test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /mnt/datastore/ssd-zfs/test/
Average Write IOPS: 10,774.70
Average Write Bandwidth (MB/s): 10,774.70
Running read test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /mnt/datastore/ssd-zfs/test/
Average Read IOPS: 16,108.98
Average Read Bandwidth (MB/s): 16,108.98
Running readwrite test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /mnt/datastore/ssd-zfs/test/
Average Read IOPS: 7,029.15
Average Write IOPS: 7,349.30
Average Read Bandwidth (MB/s): 7,029.15
Average Write Bandwidth (MB/s): 7,349.29

And this is the same FIO test on one of the Proxmox nodes:

root@proxmox01:~# mkdir /ssdimages/test
root@proxmox01:~# ./FIO_Speed_Test.sh /ssdimages/test/
Running randwrite test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /ssdimages/test/
Average Write IOPS: 7,237.17
Average Write Bandwidth (MB/s): 7,237.17
Running randread test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /ssdimages/test/
Average Read IOPS: 15,683.84
Average Read Bandwidth (MB/s): 15,683.84
Running write test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /ssdimages/test/
Average Write IOPS: 10,021.36
Average Write Bandwidth (MB/s): 10,021.36
Running read test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /ssdimages/test/
Average Read IOPS: 16,101.69
Average Read Bandwidth (MB/s): 16,101.69
Running readwrite test with block size 1M, ioengine libaio, iodepth 16, direct 1, numjobs 5, fsync 0, using 5 files of size 1G on /ssdimages/test/
Average Read IOPS: 6,969.49
Average Write IOPS: 7,286.92
Average Read Bandwidth (MB/s): 6,969.49
Average Write Bandwidth (MB/s): 7,286.92

Here is the network test between the node that 144 is on and the PBS:

 

[Disco]

Hello, I don't have a solution to this bit old thread, but I just fired up a PBU and between two servers 10G fiber connections, 40-140 Mbit/s is the speed for backup. SAS spinning drives, R730 and T630 Dell. Iperf3 gives near 10G both directions, no any extra load on servers.

INFO:  32% (298.1 GiB of 931.5 GiB) in 1h 8m 45s, read: 83.0 MiB/s, write: 78.9 MiB/s
INFO:  33% (307.4 GiB of 931.5 GiB) in 1h 10m 17s, read: 103.2 MiB/s, write: 86.3 MiB/s