Sometimes 'dump' is one run of amdump, sometimes it is the 'dump' utility that makes a backup of a filesystem. The number of filesystems that fit on a tape will vary by their size and compressability. Your bump factors in amanda.conf will also affect it.
Levels are degrees of incremental-ness in Amanda. Level 0 is a full backup. Level 1 is everything that changed since the last level 0. Level 2 is everything that changed since the last level 1. This goes on to level 9. Amanda automatically picks the 'best' level to use for each file system based on a bunch of things, including how often you want full backups (dumpcycle), how much a backup of each file system will take at each level, and how compressible that backup is likely to be, based on historical records. Your best bet for tape fitting is usually to add file systems gradually over several amdump runs, so that the initial level 0 for each new filesystem can be fit on the tape, bumping existing filesystems to level 1 or lower to make room if needed. I like to add the biggest file systems first, but that's me. > -----Original Message----- > From: Mark Schoonover [mailto:[EMAIL PROTECTED]] > Sent: Thursday, March 21, 2002 3:51 PM > To: 'Joshua Baker-LePain'; Mark Schoonover; 'Jenn Sturm'; 'Bort, Paul' > Cc: Amanda-User (E-mail) > Subject: RE: Confusion on Dumps & Configuration > > > Josh, Jenn & Paul, > > Thanks for the quick replies! I have found the error of my ways, > which leads me to a few more questions! The way I understand > it is a 'dump' > is one cron job of amdump running. OK no problem there. Now, how do I > estimate how many filesystems I can backup to a single tape?? > Trial and > error?? Not sure what a level 0 is offhand. The best I can > figure out on my > own is an entire dump of all filesystems in one run. Josh, > can I bother you > for a copy of your tapetype?? > > Thanks again! > > .mark >
