Tr : Re: RE Backup plan and big filesystems

Let's keep the other amanda users informed as I might say stupid things :-)

----- Réacheminé par Cyrille Bollu/FHQ/USERS/FEDASIL le 18/08/2006 15:51 -----

Cyrille Bollu/FHQ/USERS/FEDASIL a écrit sur 18/08/2006 15:50:41 : > Fabio Corazza <fabio AT newbay DOT com> a écrit sur 18/08/2006 15:33:19 : > > > Cyrille Bollu wrote: > > > Forget about weekly full. Amanda uses a completly different logic: > > > > > > Says you have 5 servers to backup and want every server to be full > > > backuped at least once a week. Amanda will probably do something like: > > > > > > full backup of server 1 on monday/ other servers incremental > > > full backup of server 2 on tuesday/ other servers incremental > > > full backup of server 3 on wednesday/ other servers incremental > > > full backup of server 4 on thursday/ other servers incremental > > > full backup of server 5 on friday/ other servers incremental > > > > > > You don't have to tell Amanda what server has to be backuped when. > > > Amanda will do it for you... It will simply respect your requirement of > > > "at least every server must receive a full backup once a week" > > > > Ok, this sounds nice, even if I'm not going to backup an office > > environment but a 24/7 production one. So we need to consider Saturday > > as well as Sunday inside the backup schedule. > > > > > Say you need 1 cartidge per day, with your backup scenario you will need > > > at least 2(weeks)*5(days)*1(tape_per_run)+1 = 11 tapes > > > > What "+1" means? Also, considering 7 weekdays this is going to be pretty > > consuming as of cartridges numbers.
> > > Can't I manage a better plan, say, put full dumps and incremental > dumps into the same cartridge
> > No. Amanda does not allow appending dumps on a same cartidge. That'sby design.
> > > ...
> > I think it's possible to run an Amanda configuration that only does > incremental daily backups and another one that run only full weekly backups.
> > Then you would only export the weekly full backups.
> > You will probably use in that case 2(weeks)*X(tapes_per_full) + > 7(days)*X(tapes_per_incremental). So let say 9 tapes instead of 15.
> > What do you think?
> > On Amanda side, it would probably not be that tricky. Probably the > most trickiest part of the job will be to handle these 2 sets of > tapes (weekly and daily) in your 8-tapes robot.
> > Cyrille