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Re: Lightening Hit screwed boot sequence on Stretch




On 08/21/2018 11:26 AM, J.W. Foster wrote:
I have a stock Stretch system actually with  a multiple boot to different hard drives via grub2. It has been running well for over a year even longer since I rebuilt with new Motherboard and upgraded from Debian 8.I am currently able to boot a Windows 10 drive and 2 Debian 9 drives. However the 3rd Debian 9 drive which is a server for a Mediawiki website will not boot properly. The weird thing is this occurred after we got a power surge that was not cancelled out completely by my filtering strips. (Yes I am ordering a UPS) Now the system gets to a point where it says it is trying to;  Started update UTMP about system runlevel changes. It locks up there and goes no further. I can start the boot sequence and get to a repair prompt as root in recovery mode. Problem is I have no knowledge of what to do there.  I do have full access to this disk from booting into one of the working drives. I just do not want to have to rebuild the entire database and Mediawiki server.Any ideas, suggestions, tips whatever,  please pass them on to me. I think this is fixable, but have found nada on the web that seems exactly to apply.Thanks!John Foster


Lightning and electrical utility surges are dangerous. If you have any doubts about your electrical system, consider hiring a qualified electrical contractor to test:

1. Verify proper electrical system grounding. Buried electrodes, conductors, connections, etc., corrode over time.

2. Verify the energized, grounded (neutral), and equipment grounding (protective earth) connections from all of your sub-panels and outlets back to your main panel. Thermal cycling can work electrical connections loose over time (aluminum wiring is notorious for this).


Problems with either of the above will make your electrical system both unsafe and more susceptible to lighting and electrical utility surges.


If lightning and/or electrical utility surges are common at your location, have the electrical contractor install lightning arresters, surge arresters, RF chokes, etc., at your main panel.


Once your electrical system is known good, test your computer hardware.


Buy a PC power supply tester and verify your computer power supply. For example:

https://www.newegg.com/Product/Product.aspx?Item=N82E16899129001


Download, burn to media, and run MemTest+ for 24+ hours to verify your CPU, RAM, and motherboard:

    http://www.memtest.org/#downiso


Download, install/ burn to media, and run the disk drive manufacturer's diagnostic applications for all of your drives to verify the drives. Most manufacturers offer such tools; here are some examples:

- Seagate - SeaTools Bootable

    https://www.seagate.com/support/downloads/seatools/

- Western Digital - Data Lifeguard Diagnostic

    https://support.wdc.com/downloads.aspx?DL

- Intel - SSD Toolbox


https://www.intel.com/content/www/us/en/support/products/80096/memory-and-storage/ssd-software/intel-ssd-toolbox.html


David