05-29-2019
I have some questions first:
1. What hardware is this? SPARC or x86? Exact model?
2. Do you know what the root filesystem device node is? /dev/md/????? or /dev/dsk/?????
3. Do you know how the RAID1 was configured? Using raidctl command (hardware RAID controller) or meta commands (software RAID, true SVM)?
4. What filesystem is used, UFS or ZFS?
Recovery of root password is completely different for a UFS filesystem as opposed to a ZFS filesystem.
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LEARN ABOUT MOJAVE
systemd-volatile-root.service
SYSTEMD-VOLATILE-ROOT.SERVICE(8) systemd-volatile-root.service SYSTEMD-VOLATILE-ROOT.SERVICE(8)
NAME
systemd-volatile-root.service, systemd-volatile-root - Make the root file system volatile
SYNOPSIS
systemd-volatile-root.service
/lib/systemd/systemd-volatile-root
DESCRIPTION
systemd-volatile-root.service is a service that replaces the root directory with a volatile memory file system ("tmpfs"), mounting the
original (non-volatile) /usr inside it read-only. This way, vendor data from /usr is available as usual, but all configuration data in
/etc, all state data in /var and all other resources stored directly under the root directory are reset on boot and lost at shutdown,
enabling fully stateless systems.
This service is only enabled if full volatile mode is selected, for example by specifying "systemd.volatile=yes" on the kernel command
line. This service runs only in the initial RAM disk ("initrd"), before the system transitions to the host's root directory. Note that this
service is not used if "systemd.volatile=state" is used, as in that mode the root directory is non-volatile.
SEE ALSO
systemd(1), systemd-fstab-generator(8), kernel-command-line(7)
systemd 237 SYSTEMD-VOLATILE-ROOT.SERVICE(8)