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ESXi 6.5 on Poweredge 1950 - low performance

Hi, i´ve installed 6.5 on a Poweredge 1950. 
i have a very poor performance on my virtual machines. 

Write speed about 5 mb/s.

Should i use a older ESX version?

 

Actually i am downloading the firmware iso to update the server.

I also changed one of the HDD´s. Rebuild in Progress. To avoid a slow HDD.

Also tried this:

https://anthonyspiteri.net/esxi-6-5-storage-performance-issues-fix/

 

What are the best settings for RAID 1. 2*1 TB WD SATA.??

 

What else could be? 

 

thanks in advance.

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