David Lang wrote: > Adam Levin wrote: > >The other system we saw recently is called Amplidata. They have a file > >system (if it can really be called that) that provides so much protection > >via erasure coding that you no longer need to back up the data because the > >calculated protection is three orders of magnitude better than what > >replicated backups can provide.
> so how does this protect against 'rm -rf /' or something that > overwrites the data (or corrupts the filesystem) Amplidata's website indicates they support a tape tier. Such offline backups are the air-gap security of records keeping. Offsite+offline have no common-mode failure mechanisms. Implemented with good controls, no bored teen or pissed-off employee can tamper with tapes in a safe. Business continuity (and your paycheck) can be at stake. Erasure coding is great for offline backups. I think LTO-5 implements Reed-Solomon erasure coding within each block. Objects distributed across physical devices is even better. I also like the "erase everywhere" capability of encrypted backups (with suitable key management). Erase the key and every encrypted copy of that data is instant toast. -- Charles Polisher _______________________________________________ Tech mailing list Tech@lists.lopsa.org https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
