> Initially I wanted a way to do a dump to tape like ufsdump. I > don't know if this makes sense anymore because the tape market is > crashing slowly.
It makes sense if you need to keep backups for more than a handful of years (think regulatory requirements or scientific data), or if cost is important. Storing tape is much cheaper than keeping disks running. (Storing disks isn't practical over long periods of time; not only does the signal on the media degrade, but so do some components.) > People just don't backup 300MB per night anymore. We > are looking at terabytes of data and I don't know how > to backup a terabyte a night. If you're actually generating a terabyte per day of data, I'm impressed. :-) Tape seems a reasonable way to back that up, in any case. A T10000 stores 500 GB on each tape and runs at 120 MB/sec, so a terabyte would take roughly 2.5 hours to backup with a single tape drive. LTO-4 is in the same ballpark. Of course, that assumes your disk system can keep up. The SAM-QFS approach of continuous archiving makes a lot of sense here since it effectively lets backups run continuously. I don't know how much Sun can say about the work going on to add SAM to ZFS. > Or a really big question that I guess I have to ask, do we even care anymore? If we're serious about disaster recovery, we do. In particular, remote replication is NOT a substitute for backups. Anton This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
