> On Nov 11, 2015, at 3:39 PM, Debra S Baddorf <[email protected]> wrote: > > >> 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’ve got a question about THIS STEP — see below. >> >> >> 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 > With no other replies, I’ve re-read and will assay another answer: If you are using a DIFFERENT set of ~8 tapes every week, then why not just TELL amanda that you have 999 tapes (or some near infinite number). Then you don’t have to worry about issuing the “no re-use” commands, I don’t think, because it won’t WANT to re-use any tapes, until you hit the 999 number (in which case, pick a bigger number yet). Question about your COPY step: What kind of “copy” do you envision? If you just do an amanda configuration to backup those DLE’s, amanda will try to guess correctly about the size of the last DLE and making it fit onto the tape, BUT that is dependent on your correct number for the tape size. As I understand it, she will then try another DLE too (a small one, since that’s what size still seems to be left) and when THAT doesn’t fit, that DLE will not have a LEOT and will be redone on the next tape. If you are using a non-amanda copy of individual DLEs, then amanda won’t have anything to do with your resultant tape. But you can use amanda’s AMVAULT command to copy from one set of media to another. Perhaps that’s what you need? I’ve done some of this ….. copying LTO2 tapes to virtual disk “media” and then, on another machine, copying from those virtual disk media to LTO5 tapes. That worked well, once I got the commands right. Sorry if you’ve already gotten this to work, but since nobody else answered, I thought I’d try again. 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 >
