Deb, I'm with you, periodically I have to test something, or will start an additional backup to help move data after a failure of some sort but in general I allow cron to start # amdump once/day. My understanding matches yours, balance will get thrown off, amanda may advance dumps but you chew up a lot of tape and do a lot of I/O for little overall gain if you are running multiple dumps as a matter of course.
I have even gone so far as run run multiple dumps across a very small (perhaps "1") DLE to test include/exclude or get a new dumptype (snapshot) or compress(pig/parallel zip) tested, but do not run multiple dumps as a matter of routine. In my mind running many small DLEs can be self-defeating, as can running very few very large once, each hitting a different set of constraints. My samba shares are on separate ZFS mount points and I snapshot them. My home directories are also on separate ZFS mount points but individual backups were untenable so I glob them by letter, but that means I can't do snapshots. Based on the latest emails I think Chris may have moved on, but he has these additional answers for when he cycles back. Thanks, Brian -----Original Message----- From: Debra S Baddorf <badd...@fnal.gov> Sent: Monday, November 26, 2018 3:00 PM To: amanda-users <amanda-users@amanda.org> Cc: Debra S Baddorf <badd...@fnal.gov>; Debra S Baddorf <badd...@fnal.gov>; Cuttler, Brian R (HEALTH) <brian.cutt...@health.ny.gov> Subject: Re: Configuration Rollback [Was: Reusable] ATTENTION: This email came from an external source. Do not open attachments or click on links from unknown senders or unexpected emails. > > -----Original Message----- > From: owner-amanda-us...@amanda.org <owner-amanda-us...@amanda.org> On > Behalf Of Debra S Baddorf > Sent: Monday, November 26, 2018 2:04 PM > To: amanda-users <amanda-users@amanda.org> > Cc: Debra S Baddorf <badd...@fnal.gov> > Subject: Re: Configuration Rollback [Was: Reusable] > > ATTENTION: This email came from an external source. Do not open attachments > or click on links from unknown senders or unexpected emails. > > >> On Nov 24, 2018, at 9:47 AM, Chris Nighswonger >> <cnighswon...@foundations.edu> wrote: >> >> On Fri, Nov 23, 2018 at 6:47 PM Jon LaBadie <j...@jgcomp.com> wrote: >> On Wed, Nov 21, 2018 at 11:55:21AM -0800, Chris Miller wrote: >>> Hi Folks, >>> >>> I have written some very small DLEs so I can rip through weeks of >>> backups in minutes. I've learned some things. >> > > Am I wrong in thinking that you cannot do extra backups, to get to the end > of your “dumpcycle” faster? > Dumpcycle is explicitly in days, not number of times run. Isn’t it? > > Deb Baddorf > Fermilab > > > > On Nov 26, 2018, at 1:21 PM, Cuttler, Brian R (HEALTH) > <brian.cutt...@health.ny.gov> wrote: > > Deb, > > Not sure if I'm understanding your question. If so I believe Amanda was built > with the concept of a once/day run schedule taking into account runs/cycle as > well as days/dumpcycle (for instance 5 run days in a one week dump cycle). > > Brian Yes, I agree. At one point, Chris was trying to speed this up by doing 21 runs in 10 minutes or so. Perhaps he has stopped that, and people are just continuing to quote that line (above). It’s that line that’s bothering me. He did ask "Can I specify "dumpcycle" as an elapsed count rather than an elapsed time?” Per the wiki help files, dumpcycle seems to be explicitly in “days” and cannot be changed or sped up. ( https://protect2.fireeye.com/url?k=42d018d223e76922.42d2e1e7-4a9f6eb7b4f1e3bb&u=https://wiki.zmanda.com/index.php/Dumpcycle ) Chris also asked "Are "dumpcycle" and "runspercycle" conflicting with each other?” Even if you occasionally do extra amdump runs (I do), that doesn’t bother the “runspercycle” count. It still results in “at least one level 0 within dumpcycle days”. Runspercycle just lets amanda gauge numbers for balance adjusting, and maybe promoting a DLE to do an early level 0. Doing 21 runs in NN minutes will use up all your vtapes, but will not force more than 1 level 0. Maybe I’m being pedantic, and he’s looking at other issues now. If so, nevermind me! :) Deb Baddorf
