boot blinking cursor, pre grub

[svennd]

I have a server with Centos 7, I installed Centos 7 on a 500Gb disk and have 2 disks in ZFS mirror for /data (zfs was done post install). The machine runs fine, but due to some application changes, I wanted all the services to restart and rebooted the machine. After this reboot the machine did not come online anymore and I checked : The machine does its POST and then stops at a blank screen with a blinking cursor (I can't type) From what I tried its pre-grub. (Shift or E does not show anything).

I have booted a rescue session and I can access the filesystem completely. (chrooting /mnt/sysimage works) I could even mount the ZFS mirror after loading the module. I disabled selinux and tried to remake initrd using

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dracut -f /boot/initramfs-3.10.0-514.el7.x86_64 3.10.0-514.el7.x86_64

but that did not solve anything ...

I'm kinda out of options ... The machine was installed and booted nicely before so it should be something new I guess ... tips are welcome!

[TrevorH]

Check what disk your BIOS is trying to boot from.

[svennd]

Yep, that was it, now I fubar'd my setup it runs and ends with

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root :

[svennd]

Ok I reran grub and now it boots again, thanks !

For reference :
- my boot order was wrong, pointing to a zfs partion member
- I tried to remake initramfs (must have done something wrong)
- changed the boot order to the bootable device
- remade the initramfs using :

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dracut -f /boot/initramfs-3.10.0-514.el7.x86_64 3.10.0-514.el7.x86_64

- remade grub

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grub2-mkconfig -o /boot/grub2/grub.cfg

now it boots again yaay thanks TrevorH !

[TrevorH]

dracut -f /boot/initramfs-3.10.0-514.el7.x86_64 3.10.0-514.el7.x86_64

So now you just need to yum update to get all the last 4 months fixes on there that have been released since 7.3 came out...