I'm thinking about using more than one tape, i.e. set "runtapes" parameter to a value > 1, for my updated archival setup. Is there anything special I need to keep in mind when doing this? Also, how do I set up runspercycle in this case? Is it the total number of tapes runspercycle * runtapes, or just runspercycle?
runspercycle does not need to be changed. The "runtapes" means that
for each run up to that number of tapes may be used (note: not "must").
You have to increase your tapecycle probably to cover the same dumpcycle(s), because you'll burn twice as much tapes for each run.
(well, "burn", hopefully not litteraly).
The parameter "taperalgo largestfit" will help to fill the first tape(s) to 100%. (New since amanda 2.4.3.)
This works better when also using:
dumporder "SSSSSS" # as many S's as you have dumpers
(or use "TTTTTT", which is a good approximation of SSSS, but optimises the total runtime of your backups better; I use TTTTT).
For a complete explanation why this works better, see:
http://groups.yahoo.com/group/amanda-users/message/46327
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