Not sure if this will help you but found this will researching the problem. I am not in a position to try this till the Christmas holidays so if you do try it first would appreciate you letting me know how it goes.
I would really like to hear if you have any advice on what appears to be a bug in the HPE driver for ESXi and if this also affects the DL380 from Gen 6 onward too. Do you have a list of recommended patched versions to match ESXi 6.0, 6.5, 6.7 please.
https://woshub.com/esxi-slow-disk-performance-hpe-gen8/
Excerpt from the article below
Disk driver version: scsi-hpvsa-5.5.0.100-1OEM.550.0.0.1331820
As it turned out, HP has spoiled something in the disk subsystem driver for ESXi 5.5 and disk management became not as efficient as it should. Moreover, as I found out later, this problem also occurred in the HPE ESXi 6.0, 6.5 and 6.7 images.
After talking to my mates and searching the Web, I understood that the matter was in the driver that HPE integrated in its custom image with the installer of ESXi 5.5 or later.
However, this problem can be solved. The Internet community (https://homeservershow.com) has managed to find a driver that really increases the disk performance in HP Microserver Gen8.
Driver version: scsi-hpvsa-5.5.0-88OEM.550.0.0.1331820
You can download the driver for free from the official HPE website:
https://support.hpe.com/hpsc/swd/…b1dfc5314e02bc01b1436b
Type: Driver — Storage Controller
Version: 5.5.0-88.0(9 Sep 2014)
Operating System(s): VMware vSphere 5.5
File name: scsi-hpvsa-5.5.0-88OEM.550.0.0.1331820.x86_64.vib (707 KB)
Now we need to install it. The procedure is described below. First of all, check the version of the installed driver, and if it is different, replace it for the right one.