It depends on how often you require full backups. I was getting really low tape utilization and big swings in amadmin 'balance' results, so I cut my dumpcycle and runspercycle in half, and now I get more consistent tape usage, and level 0 backups twice as often as a side benefit. Amanda's tape fill planning degrades gracefully when there is excess tape, nothing to worry about, but it still degrades.
> -----Original Message----- > From: Jon LaBadie [mailto:[EMAIL PROTECTED]] > Sent: Thursday, March 21, 2002 2:30 PM > To: [EMAIL PROTECTED] > Subject: Re: amflush and irc? > > > On Thu, Mar 21, 2002 at 12:16:10PM -0600, Brandon D. Valentine wrote: > > On Thu, 21 Mar 2002, Jon LaBadie wrote: > > > > >You won't. After running a while amanda will spread the > level 0's over > > >all the dump days. So if your once a week tape "now" gets > 40GB and your > > >daily "incrementals" now get 2, each will average about 8 GB daily. > > > > Actually it's even better than that. Each tape should > average a full > > 40GB. Amanda will do its best to fill each and every tape > to capacity, > > promoting as many full dumps per run as possible. If you > have 40GB of > > data and a 40GB tape drive, you should get a full set of level 0s on > > every run. > > YMMV, but that has not been my experience. > > My tapes are 12GB (dds3) and although I have about 50GB > (data precompression, not disk) to back up, my nightly > tape usage is about 7GB. > > I thought the planner attempted to get a consistant > nightly backup, not a filled-tape backup. Our differing > observations may be the result of different amanda.conf settings. > > -- > Jon H. LaBadie [EMAIL PROTECTED] > JG Computing > 4455 Province Line Road (609) 252-0159 > Princeton, NJ 08540-4322 (609) 683-7220 (fax) >
