强制禁用回写缓存，并且缓存备份设备状态为 unknow

适用场景

E 系列

问题描述

• EML 报告 Write-back caching forcibly disabled。
• 缓存备份设备状态为 UNKNOWN。

         Cache Backup Device
           Status:                    UNKNOWN
            Type:                      USB flash drive
            Location:                  Controller A, Connector USB 2
            Capacity:                  3,072 MB
            Product ID:                Ext Hard Disk
            Part number:               Not Available
            Serial number:             xxxxxxxxx
            Revision level:            0000
            Manufacturer:              OEM
            Date of manufacture:       Not available
            Status:                    UNKNOWN
            Type:                      USB flash drive
            Location:                  Controller A, Connector USB 1
            Capacity:                  3,072 MB
            Product ID:                Ext Hard Disk
            Part number:               Not Available
            Serial number:             xxxxxxxxx
            Revision level:            0000
            Manufacturer:              OEM
            Date of manufacture:       Not available