check fs / storage for corruption

fs_checker.py

#!/bin/env python3

import os
import sys

data_dir = "checker-data"
try:
    os.mkdir(data_dir)
except FileExistsError:
    pass

print("Writing and reading checker data to dir: {}".format(data_dir))

count = 1

while True:
    with open("checker-data/{:08}".format(count), "w") as w:
        w.write(str(count) * 100)

    for i in range(1, count + 1):
        with open("checker-data/{:08}".format(i), "r") as r:
            line = r.readlines()[0]
            expected = str(i) * 100
            if line != expected:
               print("Found inconsistency in {}".format(i))
               print("Got      '{}'".format(line))
               print("Expected '{}'".format(expected))
               sys.exit(1)

    count += 1

1. in the terminal cd into a folder in the mount where you're suspecting data corruption
2. copy and paste this python code in a file: cat > fs_checker.py
3. chmod +x fs_checker.py
4. run it: time ./fs_checker.py
5. if nothing gets printed that means no issues are found
6. ⌨️ Ctrl-c when you're tired of waiting
7. check how much data has been written: du -sch checker-data/
8. cleanup: rm -rf checker-data/