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d3mon187's avatar
d3mon187
Copper Contributor
May 28, 2019

Slow Server 2019 Disk Performance

I recently built a cluster of new to me Dell R620s, which run HyperV with various services.  I noticed right away that these servers were running slower than our old servers, with poor mysql performa...
storage
windows server
RudiHansen's avatar
RudiHansen
Copper Contributor
Nov 29, 2021

Has there been any updates on this?
I am having the same issue with my own server, 2019 seems to be about 3-5 times slower reading and writing data to disks with RAID1.
Removing Defender-Service and disabling Receive Side Coalescing, made no change.

Installing server 2016 on the same machine, and all RAID1 drives are back to the expected speed.

 

Just to test further I did also install two VM's with 2016 and 2019 on another machine with non raid drives, and both servers showed normal disk speed.

So it does seem like its a problem only on RAID drives, I do not currently have a machine with non raid drives to test the installation on, so can't test that.

  • haidongh's avatar
    haidongh
    Icon for Microsoft rankMicrosoft
    Jun 03, 2022

    RudiHansen 

     

    Please try this 

    Setting the "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\MaxLazyWritePages" to HEX value of 2000  in Windows 2019

    • TheStev0's avatar
      TheStev0
      Copper Contributor
      Mar 06, 2023

      haidongh can you provide any documentation on this registry value and why you think it might be needed on Win2019 vs 2016?

      • Tiago_Meireles's avatar
        Tiago_Meireles
        Icon for Microsoft rankMicrosoft
        Aug 22, 2023
        Seems like a change on how Windows 2019 handles lazy write pages. Check if setting the HEX value to 2000 instead of the default will improve the performance.

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