Slow writes PERC H700 and Samsung 850 PRO SSD

I saw several posts about this, but don't see a solution.

I have a few servers R710 with H700 controllers. I have installed Samsung 1 TB SSD Pro 850 and see writing very slow compared to other performance SSD tested in one box, simply slow in general. SAMSUNG SSD are ~ 500 MB/s in both sense when connected to the stand-alone desktop computer, but ~ 500 MB/s read and ~ 45 MB/s, writes when it is connected to a server.

1. 1 x SSD in RAID 0 - no redundancy, just to test the performance. I tried all combinations of memory cache writeback and read before possible setting (enabled, disabled) and has never had more than ~ 45 MB/s, writing.

2. 6 x SSD in RAID 5 with all possible combinations of never getting write cache over ~ 110 MB/s, writing.

3. 6 x SSD in RAID 10 yet one time all possible settings of the writeback cache - ~ 140 MB/s.

Finally, I installed 120 GB Intel SSD and got more than 400 Mbps in both directions without worrying about the RAID or cached.

What is the problem with the H700 and Samsung SSD controllers? No one knows how to fix?

Any other R710 compatible controller, which do not have this problem? Might be able, JBOD? I also tried a stop the controller PCIe Board without a bit of luck (bottom of basket or any compatibility issues)

Thanks in advance.

P. S.

The controller is a latest firmware and the BIOS and other components. Used Dell Repository Manager iDRAC discovery and the ISO bootable to update everything.

SAMSUNG SSD are on a latest firmware as well.

Hello.

The Samsung 850 Pro SSD are not validated or certified to work with controllers from Dell, and as such, there is an incompatibility of communication between readers and the controller at the firmware level. Thus, you are required to achieve the unexpected poor read and write performance regardless of the controller cache settings. Consider using Dell certified readers.

Thank you.

Tags: Dell Servers

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