Disabling legacy drivers on ESX 6.5 host

[Labsy2]

Hi,

I've read few articles about possible storage performance issues on ESX 5.5+ versions, which probably apply also to my fresh 6.5 standalone install, whic has very bad storage performance. This is the article I came across and triggered my mind: https://www.opvizor.com/esxi-6-5-storage-performance-issues-and-fix/

I need to migrate few VMs from one local store to another local store. It is LOCAL storage on LSI RAID controller, consisting of few RAID6 arrays (with SAS 10k drives) and few RAID10 arrays (with SSD drives). But performance is not a joy, for example:

copying 650GB from SAS to SSD array takes some 10 hours, which averages in some 18 MB/s (150 Mbps), which is almost as slow as my internet link! But copy goes from local store to local store within the same ESX 6.5 host!

So, I am thinking about DISABLING one of the drivers, but I am not sure if I can do it safely - this box is in production!

When I list drivers I see:

[root@ESX2:~] esxcli software vib list | grep ahci
sata-ahci                      3.0-22vmw.650.0.0.4564106             VMW      VMwareCertified   2017-04-27
vmw-ahci                       1.0.0-34vmw.650.0.14.5146846          VMW      VMwareCertified   2017-04-27
[root@ESX2:~] esxcli software vib list | grep lsi
lsi-mr3                        6.912.12.00-1OEM.650.0.0.4240417      Avago    VMwareCertified   2017-04-27
lsiprovider                    500.04.V0.61-0007                     LSI      VMwareAccepted    2017-04-27
lsi-msgpt2                     20.00.01.00-3vmw.650.0.0.4564106      VMW      VMwareCertified   2017-04-27
lsi-msgpt3                     12.00.02.00-11vmw.650.0.0.4564106     VMW      VMwareCertified   2017-04-27
lsu-lsi-lsi-mr3-plugin         1.0.0-7vmw.650.0.0.4564106            VMware   VMwareCertified   2017-04-27
lsu-lsi-lsi-msgpt3-plugin      1.0.0-6vmw.650.0.0.4564106            VMware   VMwareCertified   2017-04-27
lsu-lsi-megaraid-sas-plugin    1.0.0-7vmw.650.0.0.4564106            VMware   VMwareCertified   2017-04-27
lsu-lsi-mpt2sas-plugin         2.0.0-5vmw.650.0.0.4564106            VMware   VMwareCertified   2017-04-27

Via web console under STORAGE --> ADAPTERS I can find those:

vmhba0      Wellsburg AHCI Controller           Unknown   vmw_ahci
vmhba1      Wellsburg AHCI Controller           Unknown   vmw_ahci
vmhba2      MegaRAID SAS Invader Controller     Unknown   lsi_mr3

What I don't figure out is which driver is in use for STORAGE and which one I could try to DISABLE?

Also, my concern is, if I somehow disable WRONG driver and my ESX won't boot up...huh, what then?

Any ideas, suggestions from experts?