Question Poor SSD write performance in RAID1 Intel XEON mainboards

Apr 27, 2020
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Hi,
I have two Hyper-V SRV16 hosts that run on INTEL on-board RAID1 SSD subsystems.
One of them e.g. has two RAID1 SSD subsystems (Samsung 850 PRO) and one HDD RAID1.
Just by chance I figured that write performance to the SSD is about 30MB/s with 100% disk activity.
I measured with AS-SSD to verify and got conformation: write performance on all SSD is poor (~30MB write, 900MB read), on both hosts. Write performance on HDD is well.
SMART is OK.

What could be wrong/what can I do?
thx
 
Apr 27, 2020
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10
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Its write through - write back doesn't improve it significantly.
Bare metal performance: tested it without Hyper-V activated, pure SRV16 - lausy too.
The HDD-RAID performance on that same controller is as good as it should be - so what makes SSD write so bad (TRIM is activated).

I really don't have a clue how to tackle that
 
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