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Robinr06
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‎01-19-2018 07:40 AM

‎01-19-2018 07:40 AM

HP Proliant DL360 gen9 with Smart Array P440ar Controller and 4x SSD in RAID 10 slow performance

We have bought 3 almost identical Servers.
All are HP Proliant DL360 gen9 with Smart Array P440ar Raid Controller, Xeon E5-2620v4, 32GB RAM

Only diffrence is one has 4x HP SSD disks in Raid 10
The second has 8x HP 7200K SATA Disks in Raid 10
The third one has 8x HP 10kSAS in raid 10
Two have ESXi 5.5.5 update 3 installed with two Windows 2012R2 VM's on them
The one with the SAS disks has Server 2016 Hyper-V with two Windows 2016 VM's on it
When we do diffrent Disk Benchmarks (AS SSD, Atto Benchmark, Crystal Disk mark) we notice that the one with the SSD's perform at only 55% of the speed compared to the ones with the SATA and SAS disks.

Crystal Disk Mark results:
Raid 10 SAS Disks = 6866 MB/s read and 6027 MB/s Write
Raid 10 SATA Disks = 4316 MB/s read and 4521 MB/s Write
Raid 10 SSD Disks = 2106 MB/s read and 2233 MB/s write
I've read a lot on google about SSD's not performing well in a Raid, Drive Cache needs to be on or off. But I cant seem to find the problem here.

Any advice would be helpfull

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