R630 performance issue with HBA 330

Hi Team,

We have 3 servers with the below specs. These 3 are acting as storage servers with CEPH.and presenting the storage to Hyper-v/ESXi via ISCSI

Problem->We are using enterprise SSD/HDD/NVME disks only, however, the disk copy speed varies.

Example--> Presented 500 GB storage to one Hyper-V VM and created 3 partitions(C,D & E).Whenever we copy a big file(ex 40 GB),from D to E or E to C etc.. the speed varies. First time,it copies with 900 MBPS speed,second time,it copies with 400 MBPS speed,third time,it copies with 100 MBPS speed.

Its not consistent and thats the problem.What may be the issue?

2 CPU with 14 cores each

Intel(R) Xeon(R) CPU E5-2690 v4 @ 2.60GHz

Integrated NIC 1: BRCM 10G/GbE 2+2P 57800 rNDC plus Mellanox 40 G NICS for storage replication
Dell HBA330 Mini (Embedded) FW 16.17.01.00

SSD disks.

Micron 5400 series

HDD

Ultrastor

NVME

Samsung PM983.

Thanks,

Raj