Situation

Sanity Check of my Setup via iperf3

• 10G IP: 9.05 Gbits/sec / 9.31 Gbits/sec
• 1G IP: 940 Mbits/sec / 941 Mbits/sec

Backup Speed via Xen Orchestra

• 10G Remote 47.79-56.66 MiB/s

XO Remote Speed Write/Read Test:

• 10G IP: 494.19 MiB/s / 1.3 GiB/s
• 1G IP: 642.79 MiB/s / 2.68 GiB/s

dd on the nfs mount from XO

dd if=/dev/zero of=/run/xo-server/mounts/{UUID}/test1.img bs=2G count=1 oflag=dsync

739 MB/s

CPU

Host: 6vCPU each with around 25%
NAS: 4CPU total of around 5% usage

XO Remote Settings

Single vs Multiple VM

The total speed is the same.

Multiple Data Blocks

I also tested the Store backup as multiple data blocks instead of a whole VHD file. (creates 500-1000 files per backed up GB but allows faster merge) function for the nfs remote. No change.

NFS Options

nfsvers=4.1,async,noac,proto=tcp

Network Settings

MTU 1500 vs 9000

Regarding that with bigger files and dd I have no issues. I did not expected an issue here. But i even changed on both sides the MTU. No change.

TCP Checksumming

I disabled this everywhere.

Other

• I dabbled with tcp-offload-checksum-errors, but seeing that iperf3 works without that change, i didn't bother.
• This one intel-i218i219-slow-speed helped a bit on my VM with Public IP in the Data Center a bit. After i changed it in Xen Orchestra (see above)

Head Scratching

I'm currently scratching my head for where the bottle neck comes from.
If I Backup with the same Instance a Remote Host (1G Down/50M UP) Network Link to a DC with 2G/2G Sync, I'm only getting like 4MiB/s in XO.

Anyone can point me in a direction or maybe help me with this Performance degradation in Xen Orchestra?

p.s. i'm not sure to post this in the backup or the Network Category, but regarding that the network works fine. I'll post it in backup