I've a RAID1 device created with mdadm in liveuUSB mode. When I rebooted I'm front of Grub Rescue interface. So I restarted in liveUSB system and I assembled my RAID1 like :mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1 mdadm: /dev/md0 has been started with 2 drives.And I checked :    ~# cat /proc/mdstat                             Personalities : [raid1]     md0 : active raid1 sda1[0] sdb1[1]          479863808 blocks super 1.2 [2/2] [UU]          bitmap: 0/4 pages [0KB], 65536KB chunk    unused devices: <none>I tried  to mount /dev/md0 on a mount directory for reinstall GRUB and I've got this error message :       ~# mount -t ext4 /dev/md0 tmp       mount: wrong fs type, bad option, bad superblock on /dev/md0,       missing codepage or helper program, or other error       In some cases useful info is found in syslog - try       dmesg | tail or so.I checked  the syslog ::~#  dmesg | tail                                                                                                    [ 1744.109048] EXT4-fs (md0): VFS: Can't find ext4 filesystem     I suppose I can not boot the system with RAID1 configured as the grub doesn't reconize the md0 files system. So for booting the system, I've to do fsck.ext4 -f -y on each devices and the Grub can recognize the file system of /dev/sda1, but I can not assemble the booth devices as RAID1 may  fsck.ext4 removed the superblock or /dev/sda1 is busy.How I should to do for get an issue?
How to mount mdadm RAID1 file system
grub2;software raid;raid1