Issues on Windows server guest disk speed

Hello
i've a very strange issues.

I've try different configuration but the result was always the same.
Mu HW and configuratin:
6 node Cluster
each node:
HPE DL360 Gen10 dual Xeon 42100
384GB of Ram
2 x 40gbit port
OS installad on a radi1:
2x Samsung PM1643a 960GB 2.5" SSD SAS 12G DWPD 1 MZILT960HBHQ-00007

For the data we use CEPH
on each server we have 1 or 2
Samsung PM9A3 7.68TB 2.5" U.2 SSD PCIe 4.0 x4 MZQL27T6HBLA-00W07 DWPD 1
for a total of 6 ore 12 disk for each cluster.

On one...

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