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HPE Smart Array P408i 2GB experiencing a performance drop

ayi

I have two HP ProLiant ML 350 GEN 10 with a RAID 10 SSD Samsung disks and HPE SmartArray P408 with 2 GB cache. It has good performance:

When copying large files, performance drops after two minutes...

From 10 GB NIC to P408i: (from 900 MB/s to 50 MB/s):

From internal NVME disc to P408i: (from 900 MB/s to 40 MB/s):

From internal SSD_AHCI to P408i (from 550 MB/s to 36 MB/s)

I installed both SSD and NVMe PCI-E to the server and there's no drop in performance.

FROM 10 GB NIC to NVME:

FROM 10 GB NIC to AHCI _SSD:

I have another HP ProLiant ML350 GEN 10 with the same SmartArray controller, same firmware, same driver, same cache configuration, and does not have this problem.

Hope someone can help me!!

ayi

The issue here may be the limitations of the Samsung QVO 870 SSDs in use.

When using a Samsung QVO 870 SSD, the initial write speed using the SLC cache is typically around 500 MB/s. However, once the SLC cache is exhausted, the write speed drops significantly as the drive switches to QLC NAND, which can slow down to approximately 80-160 MB/s depending on the workload and the specific model. This drop occurs because QLC NAND is much slower at writing data compared to SLC NAND.

From: https://www.anandtech.com/show/15887/the-samsung-870-qvo-1tb-4tb-ssd-review-qlc-refreshed/2

The SLC caches on the 870 QVOs run out right on schedule, at 42 GB and 78 GB. Write performance drops precipitously but is stable thereafter, for the rest of the drive fill process. This behavior hasn't changed meaningfully from the 860 QVO.

Do you have access to better disks for this purpose?