使用ssacli可以修改p420i阵列卡为直通模式，注意，修改以后，硬盘所有数据清空。

ssacli controller slot=0 modify hbamode=on forced

重启后，检查阵列卡状态，HBA Mode Enabled = True即为直通模式。

ssacli ctrl slot=0 show

Smart Array P420i in Slot 0 (Embedded)
   Bus Interface: PCI
   Slot: 0
   Serial Number: 000000000000
   Controller Status: OK
   Hardware Revision: B
   Firmware Version: 8.32
   Firmware Supports Online Firmware Activation: False
   Cache Board Present: False
   Cache Status: Not Configured
   Total Cache Size: 0.0
   Total Cache Memory Available: 0.0
   Battery Backed Cache Size: 0.0
   Controller Temperature (C): 76
   Number of Ports: 2 Internal only
   Driver Name: hpsa
   Driver Version: 3.4.20
   HBA Mode Enabled: True
   PCI Address (Domain:Bus:Device.Function): 0000:02:00.0
   Port Max Phy Rate Limiting Supported: False
   Host Serial Number: 000000000
   Sanitize Erase Supported: False
   Primary Boot Volume: None
   Secondary Boot Volume: None