Hi@all,
I don’t think it’s a UCS problem, but someone might have a tip anyway.
Until three days ago, my UCS master was running on a UCS backup (KVM host) The speed was great. Read/write access via NFS was about 80-120 MB/s 
But now it was not a good idea to “put” a UCS backup as KVM host “under” a UCS Master (VM). Therefore I rebuilt the system on the same hardware:
2 x Intel(R) Xeon(R) Silver 4114 CPU @ 2.20GHz
128GB RAM registered ECC
LSI SAS 9361-8i RAID controller (12GB/s)
4 x 2TB SSD (RAID5)
With Proxmox-VE (6.1.5) as KVM host. Now I can only read/write to NFS with 10-12 MB/s.
I’ve already tried to isolate the problem. Installed a VM (same VM host) with Ubuntu 19.10, mounted into the UCS domain and mounted NFS.
-> 700 MB/s
The connection of the VM host (Proxmox) to the physical network is the same as the previous one with UCS.
The network card also runs with 1000MBit:
root@vmhost01:~# brctl show
bridge name bridge id STP enabled interfaces
vmbr0 8000.a0369f4c3bee no ens1f1
tap100i0
tap101i0
tap102i0
tap103i0
vmbr1 8000.0025905eb00f no enp96s0f1
vmbr1v7 8000.0025905eb00f no enp96s0f1.7
tap100i1
root@vmhost01:~# ethtool ens1f1
Settings for ens1f1:
Supported ports: [ TP ]
Supported link modes: 100baseT/Full
1000baseT/Full
10000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 100baseT/Full
1000baseT/Full
10000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
I performed the bridge configuration in Proxmox as recommended in the manual. This was the same on the UCS KVM host.
In my opinion, the problem must be Proxmox. Anybody got any advice for me?
with best
sven