> On Nov 11, 2015, at 2:55 PM, David Simpson <[email protected]> wrote: > > Hi all, > > Thanks for the help so far. This has saved me a lot of time. > > I have a fair amount of data I'm looking to copy (potentially ~30TB) - that > is data from multiple file-servers to multiple tapes and without LEOM. Am I > correct in saying this is the implication(?) - Amanda will get so far through > the disklist then realize it can't fit a DLE onto a tape then load the next > [correctly labeled] tape? > > > I will be loading 8 LTO6 tapes into the tape changer (currently max > capacity). I only have this one tape changer at my disposal. > > I'm looking to do two things with the same data: > > 1) perform a one-off archive and remove the tapes for safe storage off-site > 2) load a new set of tapes and use amanda as a near-line storage solution > (quick backup/restore over network) > > Both of these can be achieved with the identical config I think? I just need > to specify the exact days for 1) then remove the tapes... before doing so, > will i need to use amadmin to say do not re-use these tapes? (incase I > retrieve from safe storage to do a restore from) > > Does this sound sensible? > > dumpcycle 1 week > runspercycle 5 > tapecycle 8 ?
To address only THIS part of the question: I would recommend a MINIMUM of tapecycle 15 # 3 weeks - 5 runs times 3 weeks. and if you can manage it tapecycle 20 # 4 weeks - 5 runs times 4 weeks. or more. If you use one tape per night (runtapes 1 is the default; you didn’t mention how many you need?) then you are only giving yourself half a week before you overwrite your last full backup. 8 tapes means you are overwriting a full backup BEFORE you write another full backup, and you might not be able to do a restore. Amanda doesn’t promise on WHICH day any one DLE will get a full done. So maybe the DLE that you need to restore today doesn’t have ANY full because you overwrote it last night? (Yeah, I just said that, didn’t I.) My philosophy is “if the data is worth anything at all to us, then it is worth buying enough tapes to have at least 4 weeks of backups”. I’ve got a 10 week rotation of tapes right now. Deb Baddorf Fermilab > > cronjob to invoke amdump once sun-thur inclusive at night ... any new DLE > configured fri, meaning full backup of new DLE performed sunday > > > thanks > David > > -------------------- > David Simpson - Computing Support Officer > IBME - Institute of Biomedical Engineering > Old Road Campus Research Building > Oxford, OX3 7DQ > Tel: 01865 617697 ext: 17697
