NetWatchman wrote:
Here are some of the challenges/questions:
My full backups are huge (multi-TB) so filling tapes is not a problem. However, daily incremental might
only be 20-30GB. Since I'm using 1.5 and/or 2TB drive for "tapes" I'm able to get good
"filling" of the tapes when doing full backups, but I'll potentially only fill up 50GB other
times....this potentially leaves a lot of "tapes' mostly empty and is kinda a waste of an expensive
resource.
I can work around this by disabling auto-flush...doing a bunch of backups over the course
of several days until I have at least 2TB on the holding disk, then mounting a
"tape" and doing a flush...problem is then it requires me to manual monitor it
which I'd like to avoid...
set:
flush-threshold-dumped 100
flush-threshold-scheduled 100
taperflush 100
I've read all of the discussions on using vtapes, but they all center on using a fix
mounted drive (or multiple drives in RAID). So I certainly could create 200 10GB vtapes
on a 2TB drive, but I really need a total of 20TB of backup capacitiy...how do I setup
vtapes on 20 different drives, but I only have the "slot" capacity to have 5 of
them physically mounted at any given time. Bottom-line, I'm unclear on how I could use a
vtape approach with MULTIPLE physical disks. I don't want to do RAID as I want the
ability to migrate some of these backups offsite...doing vtapes on RAID would seem to
signficantly complicate that process.
amanda-3.3 (not yet released) can use multiple changer, you set a
chg-disk for each physical disks.
Jean-Louis
