I'm running an ESXi 6.0.0-2494585-standard server. On this server are ~20 virtual machines running (ubuntu/suse linux & windows 7 & 10). The performance of all VMs is fine, except the windows 10 VMs peformance.

In windows Task Manager the disks Read/Write speed maximum was ~3,4MB/s. The active time is quite high, usually close to 100% in idle. The result of HDTune Benchmarks is totally fine with an average of more than 100MB/s.

I found this: https://kerpanic.wordpress.com/2015/09/26/windows-10-slow-in-vmware-try-this/

After setting the size of the virtual memory as suggested, the task managers maximum disk read/write spead is at ~10MB/s.

Still the system is incredibly slow, when i type "c" "m" "d" into search i have to wait 5 seconds until all letters are there and another 3 seconds until the result shows up.

Do you have any idea how to fix this?

Additional Information: Win10 VM has 8GB RAM, more than enough CPU speed/cores.

The Servers Hardware (Server was bought as 100% VMWare 6.0 compatible): Board: Supermicro X9DRi-F CPU 1* XEON E5-2620 V2 RAM: 8 * 8GB Registered 12800 RAID Controller: MegaRaid 9271-8i with BBU Unit RAID configuration: RAID 6 with 5 * 3TB Caviar Red (WD30EFRX)

I hope thats all information you need.

Thanks for your help, Paul

  • Nobody having any idea? – PaulG Jun 9 '17 at 10:11

What adapter drive were you using?

I was facing similar Windows 10 disk slow problem with ESXi 6.5.0d the latest version, but I was using a single SSD, not RAID. The adapter drive was vmw_ahci. After disable vmw_ahci and remove the disk add it again, Windows 10 disk performance much better.

esxcli system module set --enabled=false --module=vmw_ahci

This solution may not suite your situation since you were using RAID. Just for your information.

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