Looks like it’s fixed in 6.5 Update 1!
Since the upgrade to ESXi 6.5 on my homelab i got bugged with a strange issue.
All my SATA SSD got really high latency and my VM’s randomly froze when i generated a big file copy actions. Latencies in the 5000/15000ms! Yes IEW!
In the logs on my ESXi host i saw random:
Lost access to volume 583fe5a3-45d215a5-8eb9-00151791b8b6 (SSD01) due to connectivity issues. Recovery attempt is in progress and outcome will be reported shortly.
With ESXI 6.5 the AHCI driver has been updated to a newer version, the native driver, vmw–ahci is used out of the box.
[root@vDrone-ESX01:~] esxcli software vib list | grep ahci
sata–ahci 3.0–22vmw.6184.108.40.20664106 VMW VMwareCertified 2016–11–16
vmw–ahci 1.0.0–32vmw.6220.127.116.1164106 VMW VMwareCertified 2016–11–16
So i tried disabling this driver and let it use the sata-ahci driver.
Via SSH: esxcli system module set –enabled=false –module=vmw_ahci
After entering this command, reboot your host.
Using the host client you can check now which driver AHCI is using.
Booted up all my VM’s and presto, no more high latency and freezes. Looks like the new vmw_ahci driver is not that stable yet on some intel chipsets. In my case a X99 chipset.