I'm setting up a new Ubuntu 18.04 server and have already played through one backup/restore loop. So the entire system has been restored from backup with a fresh RAID and LVM volumes.
Now recently, unattended-upgrades has reported this:
Processing triggers for initramfs-tools (0.130ubuntu3.8) ... update-initramfs: Generating /boot/initrd.img-4.15.0-66-generic I: The initramfs will attempt to resume from /dev/dm-1 I: (/dev/mapper/vg0-swap) I: Set the RESUME variable to override this.
I tried to find out what that actually means but wasn't successful. What is it resuming there? Some process of generating boot files? I know it can take a while do do that. Does it have to do with the RAID? That is long finished with its resync. I don't get it. And what's actually wrong? What does that message want me to do? I'm clueless. If I don't need it, how can I make it go away?
The server did reboot successfully twice after that message so it can't be important. (If that "I" was supposed to mean something like that.)
Here's some commands if that helps:
> lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root vg0 -wi-ao---- 400.00g swap vg0 -wi-ao---- 8.00g > cat /proc/mdstat Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md1 : active raid1 nvme1n1p2 nvme0n1p2 499449152 blocks super 1.2 [2/2] [UU] bitmap: 1/4 pages [4KB], 65536KB chunk md0 : active raid1 nvme0n1p1 nvme1n1p1 523264 blocks super 1.2 [2/2] [UU] unused devices: <none>
I can't find a good command to show something about these "dm-0" and "dm-1" devices that are also related to the RAID I guess.