How to downgrade SCSI driverrs on ESXi.
Apparently only well working SCSI driver version is 5.5.0-88, if your server is suffering from low RAID performance downgrade is required.
- Upload scsi-hpvsa-5.5.0-88OEM.5184.108.40.2061820.x86_64.vib to /var/log/vmware/
- Remove any old drivers with esxcli software vib remove -n scsi-hpvsa -f
- Install driver esxcli software vib install -v file:scsi-hpvsa-5.5.0-88OEM.5220.127.116.111820.x86_64.vib
Download driver here.