[CentOS] Problem with softwareraid

[Gordon Messmer]

On 08/19/2017 12:06 PM, Mr Typo wrote:
> sda                                          8:0    0   1.8T  0 disk
> ├─sda1                                       8:1    0   1.8T  0 part
> └─WDC_WD20EFRX-68AX9N0_WD-WMC1T2547260     253:3    0   1.8T  0 mpath
>    └─WDC_WD20EFRX-68AX9N0_WD-WMC1T2547260p1 253:8    0   1.8T  0 part


You haven't said anything about multipath hardware yet, and you've been 
referring to "sda1", etc, which makes me think that you probably don't 
have multipath hardware.

If that's true, then the problem is probably that someone installed the 
multipath software on this system after the last time it booted 
successfully.  One fix could be to boot from install media and use 
rescue mode to get a shell.  Inside the rescue environment, remove the 
multipath software.

If you did have multipath hardware, you'd be assembling the multipath 
targets, like WDC_WD20EFRX-68AX9N0_WD-WMC1T2547260p1, rather than sda1.