X-Post: https://serverfault.com/q/1044339/374973
I tried this out in a VirtualMachine to hope I can learn something.
**Problem**
The RAID1 does not containt any systmem relevant data - the OS is on
another drive. My Debian 10 does not boot anymore and tells me that I am
in emergency mode and "Cannot open access to console, the root account
is locked.". I removed one of the two RAID1 devices before.
And systemd tells me while booting "A start job is running for
/dev/md127".
**Details***
The virtual machine contains three hard disks. /dev/sda1 use the full
size of the disc and containts the Debian 10. /dev/sdb and /dev/sdc (as
discs without partitions) are configured as RAID1 /dev/md127 and
formated with ext4 and mounted to /Daten. I can read and write without
any problems to the RAID.
I regualr shutdown and then removed /dev/sdc. After that the system does
not boot anymore and shows me the error about the locked root account.
**Question 1**
Why is the system so sensible about one RAID device that does not
contain essential data for the boot process. I would I understand if
there is a error messages somewhere. But blocking the whole boot process
is to much in my understanding.
**Question 2**
I read that a single RAID1 device (the second is missing) can be
accessed without any problems. How can I do that?
**More details**
Here is the output of my fdisk -l. Interesting here is that /dv/md127 is
shown but without its filesysxtem.
Disk /dev/sda: 128 GiB, 137438953472 bytes, 268435456 sectors
Disk model: VBOX HARDDISK
Disklabel type: dos
Disk identifier: 0xe3add51d
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 266338303 266336256 127G 83 Linux
Disk /dev/sdb: 8 GiB, 8589934592 bytes, 16777216 sectors
Disk model: VBOX HARDDISK
Disk /dev/sdc: 8 GiB, 8589934592 bytes, 16777216 sectors
Disk model: VBOX HARDDISK
Disk /dev/md127: 8 GiB, 8580497408 bytes, 16758784 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Here is mount output:
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
/dev/sda1 on / type ext4 (rw,relatime,errors=remount-ro)
/dev/md127 on /Daten type ext4 (rw,relatime)
This is /etc/fstab:
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda1 during installation
UUID=65ec95df-f83f-454e-b7bd-7008d8055d23 / ext4
errors=remount-ro 0 1
/dev/md127 /Daten ext4 defaults 0 0
