问题场景：
RAID0磁盘故障，更换磁盘后重启OS时发现不能正常引导进入OS，报错如下:
AVAGO MeGaRAID SAS-MFI BIOS
Version 6.31.03.0 (Build January 25,2016)Copyright(c) 2016 AUAG0 TechnologiesHA -0(Bus 1 Dev 0) SAS3108FW package: 24.15.0-0016
There are offline or missing virtual drives with preserved cache.
Please check the cables and ensure that all drives are present.
Press any key to enter the configuration utility.
解决方法：
服务器重启默认进入以下页面选择 SAS3108(Bus 0x01, Dev 0X00) 按F2
按F2之后选择——
Manage Preserved Cache——
选中之后回车进去然后按——
discard the cache
按完之后会提示YES or NO 选择YES
Ctrl+Alt+Del 重启服务器即可
附：DELL官方对此问题的一些说明：
Error Message：
There are offline or missing virtual drives with preserved cache.
Please check the cables and ensure that all drives are present.
Press any key to enter the configuration utility.
Probable Cause：
The controller preserves the dirty cache from a virtual disk if
the disk becomes offline or is deleted because of missing physical disks.
This preserved dirty cache is called pinned cache, and is preserved until
you import the virtual disk, or discard the cache.
Corrective Action：
Use the utility to import the virtual disk or discard the preserved cache.
For the steps used to manage preserved cache, see Managing Preserved Cache.
