Wow. It's possible that you have nailed this.

Edit: here's why I like this theory. I don't believe that the two disks had similar levels of wear, because the primary server would get more writes than the standby, and we switched between the two so rarely. The idea that they would have failed within hours of each other because of wear doesn't seem plausible.

But the two servers were set up at the same time, and it's possible that the two SSDs had been manufactured around the same time (same make and model). The idea that they hit the 40,000 hour mark within a few hours of each other seems entirely plausible.

Mike of M5 (mikiem in this thread) told us today that it "smelled like a timing issue" to him, and that is squarely in this territory.

#!/bin/bash

# Convert images to PDF

img2pdf *.jpg -o images.pdf

# Merge PDFs

pdfunite file1.pdf file2.pdf images.pdf merged.pdf

# Compress

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook \ -dNOPAUSE -dQUIET -dBATCH -sOutputFile=compressed.pdf merged.pdf

# Remove unwanted pages (e.g., page 3)

pdftk compressed.pdf cat 1-2 4-end output final.pdf

# Add page numbers

pdfjam final.pdf --outfile final_numbered.pdf --pagecommand '{}' --landscape