On Fri, 19 Jan 2007 at 3:05am, Yogesh Hasabnis wrote
We have data which is approximately 220GB in size. We
have got an HP Ultrium 960 tape device for our backups
with 10 numbers of media (400GB LTO3). I have a few
queries about media rotation. I plan to use a
dumpcycle of 5 days (5 working days of a week).
If you're only going to running 'amdump' on weekdays, use dumpcycle=1
week, not 5 days. Otherwise the weekend will confuse amanda. So, for
your model:
dumpcycle 1 week
runspercycle 5
tapecycle 10
Suppose I use a media set of 5 media for week1 and use
the set of remaining 5 media for week2 and use the
media sets alternately for alternate weeks. When I
reuse the first media set for week3, will the earlier
backup on the media set be overwritten or will the
backup of week3 coexist with the earlier backup?
Amanda never appends to tapes -- that's a design decision. So when a tape
gets reused, whatever is on it gets overwritten.
The man page of amanda.conf says that "The number of
tapes in rotation must be larger than the number of
tapes required for a complete dump cycle." What does
this exactly mean? So in my case if my dumpcycle
requires 5 media, do I need to use more than 5 tapes
in my tape cycle and why?
This all has to do with amanda not appending to tapes.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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