UCS Master (NFS) on Proxmox extremely slow



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 :slight_smile:

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
vmbr1		8000.0025905eb00f	no		enp96s0f1
vmbr1v7		8000.0025905eb00f	no		enp96s0f1.7
root@vmhost01:~# ethtool ens1f1
Settings for ens1f1:
	Supported ports: [ TP ]
	Supported link modes:   100baseT/Full 
	Supported pause frame use: Symmetric
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  100baseT/Full 
	Advertised pause frame use: Symmetric
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: 1000Mb/s
	Duplex: Full
	Port: Twisted Pair
	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

There is one difference between the old UCS master and the new one. The old one was ext4, the new one is XFS formatted