On Sat, Oct 02, 2010 at 09:05:44AM -0400, Robert Heller wrote: > Why does Amanda do multiple level 0 backups? I only want 1 (and only > 1) level 0 backup (of any given disk) in the backup cycle (4 weeks / 28 > days). The documentation for the bump* parameters is not clear (to > me). I want Amanda to aggressively bump dump levels.
Hmm, I thought the descriptions in the amanda.conf(5) manpage were pretty clear. [snip] > bumpsize 10 Mb # minimum savings (threshold) to bump level 1 -> 2 > bumppercent 0 # minimum savings (threshold) to bump level 1 -> 2 > bumpdays 2 # minimum days at each level > bumpmult 1 # threshold = bumpsize * bumpmult^(level-1) Two changes would increase the likelyhood of bumping levels: change bumpsize to a smaller value (eg. 1 Mb or 500 Kb) change bumpdays to 1 > I don't have enough virtual tapes to do more than one level 0 backup in > a backup cycle. Yeah, I see that your setup is: > dumpcycle 4 weeks # the number of days in the normal dump cycle > runspercycle 28 # the number of amdump runs in dumpcycle days > tapecycle 30 tapes # the number of tapes in rotation And you are telling amanda it can use up to 56 tapes per cycle. > runtapes 2 # number of tapes to be used in a single run of amdump I hope very few dumps take more than one tape, like none :) When the Wendell Free Library adds 2 or 3 DVDs to its filesystem, > /dev/mapper/WendellFreeLibrary-dvdisos > 34G 177M 32G 1% /dvdisos it will never backup because its size will be greater than your tapesize * your runtapes setting. Even if your amdumps only use 1 tape per run and you get the aggressive bumping you seek, I think you are on the edge of a disaster. Suppose a DLE gets its level 0 on day 1 and incrementals for the rest of the cycle (days 2 to 28). On day 29 it gets its regularly scheduled level 0 and on days 30 and 31 it gets incrementals. But that last incremental wipes out the first level 0 and makes all 27 of its incrementals lose much of their value. Jon -- Jon H. LaBadie [email protected] JG Computing 12027 Creekbend Drive (703) 787-0884 Reston, VA 20194 (703) 787-0922 (fax)
