VMWare HP Microserver Gen 8

Had very slow disk performance on a RAID 1 array in ESXi on my new HP Gen 8 microserver and found hardware acceleration was disabled.

The answer appears to be rolling back the storage driver as per

esxcli software vib remove -n Hewlett-Packard:scsi-hpvsa
esxcli software vib install –viburl=/vmfs/volumes/DATASTORE/scsi-hpvsa-5.5.0-88OEM.550.0.0.1331820.x86_64.vib

Driver available from


First update all drivers via
esxcli software vib update –depot= –force
esxcli software vib update –depot= –force

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