low transfer rates on HP ProLiant DL380 Gen10 drives: second try

[rafaill1]

Before I turned on cache I have poor trasfer level: SEQ1M Q8T1 read: 1999 MB/s, write: 1909 MB/s
I turned on the cache. It helped. For a while I had a transfer rate of:
SEQ1M Q8T1 read: 6955 MB/s, write: 6893 MB/s
However, now it's back to the level again:
SEQ1M Q8T1 read: 1999 MB/s, write: 1909 MB/s
How to get better transfer rate permanently?

My HPE Smart Array configuration:

FirmwareVersion 5.00

SupportedDeviceProtocols SAS,SATA

SupportedControllerProtocols PCIe

CacheSummary.TotalCacheSizeMiB 2048

CacheSummary.PersistentCacheSizeMiB 1808

CacheSummary.Status.Health OK

CacheSummary.Status.State Enabled

SupportedRAIDTypes RAID0,RAID1,RAID10,RAID5,RAID50,RAID6,RAID60,RAID1Triple,RAID10Triple

Name HPE Smart Array P408i-p SR Gen10

Identifiers.DurableName 51402EC01838A210

Identifiers.DurableNameFormat NAA

Manufacturer HPE

PartNumber 830826-001

SerialNumber

SpeedGbps 12 SKU 836269-001

PCIeInterface.MaxPCIeType Gen3

PCIeInterface.PCIeType Gen3

PCIeInterface.MaxLanes 8

PCIeInterface.LanesInUse 8

ControllerRates.ConsistencyCheckRatePercent 89

ControllerRates.RebuildRatePercent 100

ControllerRates.TransformationRatePercent 100

[support_s]

System recommended content:

1. HPE ProLiant MicroServer Gen10 - Hardware Troubleshooting

2. HPE ProLiant DL360 Gen10 Server - Spare Parts

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[ngnear]

Hi There,
It is suggested to get the firmware version to the latest iteration.

https://support.hpe.com/connect/s/softwaredetails?language=en_US&softwareId=MTX_cdf40e5e90d747348e8c564485

Post update, please run the test and log a support case with us for further analysis.