On Mon, 22 Nov 2004, Guy wrote: > Amanda... > I looked into this about 2 years ago. From what I found, each daily backup > used a different tape. This is crazy! I can put 10-20 days on 1 tape. > Maybe more, not really sure. Of course it is based on how much data changes > each day. So, my full backups are only needed about once every 2-3 weeks. > > Since Amanda uses up too many tapes, I use a home grown set of scripts that > maintain the tape position and use cpio for the backup. > > Do you know if the above is true about Amanda? Yes. Amanda uses one tape per backup. It writes a label at the start of every tape to make sure it's writing the backup to the right tape. With your system, if you lose one tape, you lose a lot of backups (however, I have a client who uses one removable disk and I store multiple backups on that disk)... > About tape age. I know of a system that has DLT tapes that are over 7 years > old. They have 21 tape drives total in 7 tape juke boxes. No idea about > the number of tapes, but well over 4000. These very in age from less than 1 > year to over 7 years old. They also have 2 copies of all data. So, if a > tape fails, just find the copy. Also make a new copy to maintain 2 copies. As long as they remember to take a set of tapes out of the jukebox from time to time and replace with fresh :) Gordon - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
