I'm sorry if this is a FAQ; I tried searching and didn't find anything.
I am still running 2.4.5p1 because I haven't updated the server side for
krb4 yet.
I have been running amanda for a very long time, and up until now on DDS
(1, 2 and then 3). Most recently I had 15 tapes, dumpcycle 7 days, and
runspercycle 5 days, so I always had 2 and sometimes 3 fulls on tape.
I just got an LTO-2 drive (no changer), and I am setting up to use 10
tapes. I'd like to tell amanda
dumps happen 5 times per week (0005 tuesday to saturday)
I have 10 tapes.
I would like a level 0 every 4 tapes.
so that I will essentially always have 2 fulls safely on tape, even when
writing the tape with the next full dump, and even if the full dump is
one run late.
I tried:
dumpcycle 5 days
runspercycle 4
tapecycle 10 tapes
and balance showed:
due-date #fs orig kB out kB balance
----------------------------------------------
7/02 Mon 36 22172589 8364704 -8.2%
7/03 Tue 25 42117664 20905858 +129.5%
7/04 Wed 4 14313242 7170225 -21.3%
----------------------------------------------
TOTAL 65 78603495 36440787 9110196
(estimated 4 runs per dumpcycle)
(22 filesystems overdue, the most being overdue 2 days)
With dumpcycle set to 6 (and others as above), balance says:
due-date #fs orig kB out kB balance
----------------------------------------------
7/02 Mon 22 11059915 4551488 -50.0%
7/03 Tue 14 11112674 3813216 -58.1%
7/04 Wed 25 42117664 20905858 +129.5%
7/05 Thu 4 14313242 7170225 -21.3%
----------------------------------------------
TOTAL 65 78603495 36440787 9110196
(estimated 4 runs per dumpcycle)
(16 filesystems overdue, the most being overdue 1 day)
So, is the scheduler really going to be trying to write a full every 4
runs? It seems there is some roundoff going on in the above
calculations (one 4- and one 4+).
I think what I'd really like is decoupling of conveying the schedule of
when dumps happen, and the number of fulls to keep on tape, more or
less. I realize other people want to say "a full every week".
Something like:
operationcycle 7 days
runsperoperationcycle 5
dumpcycle 4 tapes
tapecycle 10
This would mean (avoiding thinking about unflushed dumps in holding
disk) that a full dump is due if there is not one on the most recently
written 3 tapes.
Perhaps I should have just used 12 tapes....
Any clues appreciated. I will be running 6/4/10 for now.
pgpELw56bU1j2.pgp
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