blinking cursor during boot

[bob y]

this node been working for few months and was just rebooting it this morning after some kernel updates, and during the starting up one of the CT, it just stuck, keyboard not responding, ping stopped responding, so had no choice than to power it off and power on again.

Now after got the grub menu, it says loading ram disk then blinking cursor. It happened before and found the issue was with the NFS server it uses being down, but not the case today, even unplug the network cable, still blinking cursor.

how do you troubleshoot and find out what caused it? Or will it be faster to reinstall a new system and restore? If restoring, what's the best way to do that? I have backed up below and also each CT/VM has their own backup. but not sure how to restore all the many CT/VMs and how to restore the VM templates. Have not found anything on googled.

/etc/
/var/lib/pve-*
/home/

Thank you

 

[fireon]

Have you tested to start with an other older kernel? You can also boot with an Livecd and do an Filesystemcheck. https://www.system-rescue-cd.org
I think reinstall is really the last option, and should not be necessary.

You can edit the grubline directly in the bootmenu. You have a line like this:

linux    /ROOT/pve-1@/boot/vmlinuz-4.2.8-1-pve root=ZFS=rpool/ROOT/pve-1 ro boot=zfs $bootfs root=ZFS=rpool/ROOT/pve-1 boot=zfs quiet intel_iommu=on rootdelay=5

Delete "quiet" and write "verbose". The boot this kernel. Maybe you can see more error messages on the screen.

 

[bob y]

Thank you but it was actually a ram issue, wish it would give out more info on errors, instead of just blinking cursor. it was ecc ram, not sure why it would suddenly caused blinking cursor.