Re: level 0 dumps getting overwritten?
At 09:57 AM 8/29/2001, Kurt Yoder wrote: >Darin Dugan wrote: > > > Or you need more tapes! > >Thanks for the info. I am probably still a bit foggy on the concepts >behind "dumpcycle", "runspercycle", and "tapecycle". > >Questions: > >In my case, I _must_ use at least 6 tapes in order for amanda not to >overwrite any of its level 0 backups? >If I wanted to use only 2 tapes, I would need to set "runspercycle" to >2? Correct, and only run amdump twice in a given dumpcycle (7 days). >"tapecycle" must always be >= "runspercycle"? Yes. >Are there any advantages to making "tapecycle" > "runspercycle"? Absolutely. For one, you might want to keep X weeks worth of backups, not just the previous week. I have a very simple scheme for instance that uses: dumpcycle 1 weeks runspercycle 5 tapecycle 10 tapes Meaning I want to be sure to have a full dump of everything at least once a week (5 runs), and since I have 10 tapes, I should have two complete cycles on tape at any given time. But think worst case (that's why you're doing backups, right?) -- if you only have tapecycle = runspercycle, when it comes time to use the "first" tape in the cycle again, you're overwriting what's on it, probably with a newer copy of the same stuff. If there's a tape error, you're screwed. If this happens in my cycle, I have the other dumpcycle worth of tapes to recover from. Though you're probably pretty safe with just one or two tapes more than runspercycle tapes (see below). >If I have "tapecycle" at 6, and define 7 tapes in the tapelist, Amanda >cycles through all 7 tapes, with a level 0 at a minimum of every 6 runs >(every 7 days, in my case)? You still want tapecycle to be the actual number of tapes (7). But runspercycle will only be 6. If you had: dumpcycle 1 weeks runspercycle 6 tapecycle 7 tapes ..you might see something like this for a given host: (the incrementals might go higher than 1, it's just an example) Monday tape1 level0 Tuesday tape2 level1 Wednesday tape3 level1 Thursdaytape4 level1 Friday tape5 level1 Saturdaytape6 level1 Sunday (no backup) Monday tape7 level0 Tuesday tape1 level1 Wednesday tape2 level1 ... Does that make any more (or less) sense? Cheers. -- Darin Dugan [EMAIL PROTECTED]
Re: level 0 dumps getting overwritten?
Darin Dugan wrote: > > At 04:01 PM 8/28/2001, Kurt Yoder wrote: > >Hello > >My level 0 dumps seem to be getting overwritten. I run amadmin and see > >only level 1 dumps: > >[...] > >Am I setting up my configuration file correctly? I've got: > > > >dumpcycle 7 days > >runspercycle 6 > >tapecycle 2 tapes > > So you're telling Amanda to make sure she has a full (level 0) backup of > everything at least every 7 days, spread into 6 runs. But you're only > giving her 2 tapes! *Buy more tapes!* Really. > > >I've got a third tape in my tapelist so I can flush dumps from my > >holding disk. I'm trying to do 6 backups every 7 days (the 7th day has a > >weekly backup set that isn't part of this configuration) using two tapes > >(alternate between them). > > If you absolutely have to stick with two tapes, you pretty much need to do > full dumps every run to be safe. (Take for instance the case where tape1 > has level0's, tape2 has level1's, you go to do level0's on tape1 again and > there's an error and the tape is fubar'd. You've just lost all hope of a > restore.) Use 'dumpcycle 0' in the dumptype to force level 0's. > > >I must be setting up my "numbers" wrong, or? > > Or you need more tapes! Thanks for the info. I am probably still a bit foggy on the concepts behind "dumpcycle", "runspercycle", and "tapecycle". Questions: In my case, I _must_ use at least 6 tapes in order for amanda not to overwrite any of its level 0 backups? If I wanted to use only 2 tapes, I would need to set "runspercycle" to 2? "tapecycle" must always be >= "runspercycle"? Are there any advantages to making "tapecycle" > "runspercycle"? If I have "tapecycle" at 6, and define 7 tapes in the tapelist, Amanda cycles through all 7 tapes, with a level 0 at a minimum of every 6 runs (every 7 days, in my case)?
Re: level 0 dumps getting overwritten?
At 04:01 PM 8/28/2001, Kurt Yoder wrote: >Hello >My level 0 dumps seem to be getting overwritten. I run amadmin and see >only level 1 dumps: >[...] >Am I setting up my configuration file correctly? I've got: > >dumpcycle 7 days >runspercycle 6 >tapecycle 2 tapes So you're telling Amanda to make sure she has a full (level 0) backup of everything at least every 7 days, spread into 6 runs. But you're only giving her 2 tapes! *Buy more tapes!* Really. >I've got a third tape in my tapelist so I can flush dumps from my >holding disk. I'm trying to do 6 backups every 7 days (the 7th day has a >weekly backup set that isn't part of this configuration) using two tapes >(alternate between them). If you absolutely have to stick with two tapes, you pretty much need to do full dumps every run to be safe. (Take for instance the case where tape1 has level0's, tape2 has level1's, you go to do level0's on tape1 again and there's an error and the tape is fubar'd. You've just lost all hope of a restore.) Use 'dumpcycle 0' in the dumptype to force level 0's. >I must be setting up my "numbers" wrong, or? Or you need more tapes! >Thanks! >-Kurt Darin Dugan System Support Specialist Iowa State University Extension [EMAIL PROTECTED] http://www.extension.iastate.edu
level 0 dumps getting overwritten?
Hello My level 0 dumps seem to be getting overwritten. I run amadmin and see only level 1 dumps: Dunedin# amadmin DailySet1 find dunedin Scanning /usr/local/amanda/holdingdisk... date host disklv tape or file file status 2001-08-25 dunedin.shcorp.com /dev/da0s1f 1 DS1tape01d 2 OK 2001-08-26 dunedin.shcorp.com /dev/da0s1f 1 DS1tape03 1 OK 2001-08-27 dunedin.shcorp.com /dev/da0s1f 1 DS1tape03 3 OK 2001-08-28 dunedin.shcorp.com /dev/da0s1f 1 DS1tape02 2 OK Am I setting up my configuration file correctly? I've got: dumpcycle 7 days runspercycle 6 tapecycle 2 tapes I've got a third tape in my tapelist so I can flush dumps from my holding disk. I'm trying to do 6 backups every 7 days (the 7th day has a weekly backup set that isn't part of this configuration) using two tapes (alternate between them). I must be setting up my "numbers" wrong, or? Thanks! -Kurt
