Hacker News new | ask | show | jobs
by csdvrx 1174 days ago
> Even then the backups need to be tested.

Isn't that the role of zfs scrub?

Or do you mean testing if say a JPG file is still a valid JPG?

I think there are scripts that can store a md5 of each file in a sqlite database for filesystems without checksumming such as xfs
1 comments
CTDOCodebases 1174 days ago
I meant tested before restoring. If the same problem as mentioned above were to occur I would have backups of all my files pre corruption though they would be spread across multiple snapshots.

Also from my understanding TCP/IP error correction isn't that that great: https://news.ycombinator.com/item?id=25335936

It's definitely possible to write a script that compares a file across multiple snapshots and flags it if it's content changes but its modification time does not. It will just get tricky when the file gets modified between backups as the file could have been modified then corrupted then backed up. In that case how does the script know that the file has been corrupted?

link