Ian Turner wrote: > On Monday 21 May 2007 13:54, Chris Hoogendyk wrote: > >> Jordan Desroches wrote: >> >>> I'm trying to figure out how to set backup retention, and was >>> wondering if it was as simple as making sure the number of tapes a >>> configuration has to use allows it to cycle through N times, or if >>> there is an actual "set retention" command I haven't found? >>> >> It's in the relationships among (taking from my configuration): >> >> dumpcycle 1 weeks # the number of days in the normal dump cycle >> runspercycle 5 # the number of amdump runs in dumpcycle days >> tapecycle 30 tapes # the number of tapes in rotation >> > > Actually, dumpcycle and runspercycle don't affect the retention policy; they > only affect the choices Amanda makes about what levels to dump at. > > The gory details of Amanda's retention policy can be found here: > http://wiki.zmanda.com/index.php/Taper_scan_algorithm
Correct (except that gory would apply to sendmail.cf, not Amanda's retention policies ;-) ). I was trying to provide a little more context in terms of clock time, because, in some other backup programs, retention is explicitly in terms of clock time. With amanda, if I ran it more or fewer days than the config file said, then the tapecycle of 30 would remain true, but would not correspond to the 6 weeks implied by the config. Also, if backups run over more than one tape, the interpretation changes. But, at least it gives some sense that I'm talking about 6 weeks. --------------- Chris Hoogendyk - O__ ---- Systems Administrator c/ /'_ --- Biology & Geology Departments (*) \(*) -- 140 Morrill Science Center ~~~~~~~~~~ - University of Massachusetts, Amherst <[EMAIL PROTECTED]> --------------- Erdös 4
