Fantastic talk, and I'm just 12 minutes in on a 1h14m video.
Take the Cartesian product, in fact, of those factors. I want location isolation, isolation from application layer problems, isolation from storage layer problems, isolation from media failure.
Edit:
They do RAID4 on the tape level. 5 tapes, one of them the parity tape.
When that fails: Reconstruction at sub-tape level. "We don't really have data loss."
"We make the backups as complicated and take as long as they need. The restores have to be quick and automatic. Recovery should be stupid, fast and simple."
Take the Cartesian product, in fact, of those factors. I want location isolation, isolation from application layer problems, isolation from storage layer problems, isolation from media failure.
Edit:
They do RAID4 on the tape level. 5 tapes, one of them the parity tape.
When that fails: Reconstruction at sub-tape level. "We don't really have data loss."
"We make the backups as complicated and take as long as they need. The restores have to be quick and automatic. Recovery should be stupid, fast and simple."