Re: F19 RAID1 drive died - what if it was sda that died?

[Gary Stainburn]

On Thursday 15 March 2018 16:34:26 Bill Shirley wrote:
>  Run:
>  grub2-install /dev/sda
>  grub2-install /dev/sdb
>
>  Now, you can boot from either drive.
>
>  Bill
>  
Hi Bill,  Thanks for this.  However, when I try this I get:

[root@lou ~]# grub2-install /dev/sda
/usr/lib/grub/x86_64-efi doesn't exist. Please specify --target or --directory
[root@lou ~]# 

A quick google shows gives the indication that this is for MBR systems where 
mine is UEFI. 

A slower google hasn't given me instructions on how to do this on a UEFI 
system in a way that I can understand.

Can anyone give the equivelant to Bill's commands above.

To review the situation. I have sda which I boot from. I have a brand new sdb 
which I use for RAID1. Should sda fail at some point I want to be able to 
unplug sda, and be able to boot from (what is currently) sdb.

this is what the two drives both look like at the moment,

[root@lou ~]# parted
GNU Parted 3.1
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print                                                            
Model: ATA ST3000DM001-1CH1 (scsi)
Disk /dev/sda: 3001GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name                  Flags
 1      1049kB  53.5MB  52.4MB  fat16        EFI System Partition  boot
 2      53.5MB  2837GB  2837GB                                     raid
 3      2837GB  2942GB  105GB                                      raid
 4      2942GB  2994GB  52.5GB  ext4                               raid
 5      2994GB  3001GB  6296MB                                     raid
 6      3001GB  3001GB  1049kB                                     bios_grub

(parted)