AFS backups with Amanda Mitch Collinsworth Cornell Center for Materials Research

Motivation A flexible, automated backup system for both AFS and non-AFS filesystems

Existing alternatives zAFS backup zADSM/TSM zOthers?

AFS backup zComplex and difficult to automate ytypical implementation uses home-grown scripts yerrors recovery requires manual intervention zCan’t share tapes with non-AFS backups

ADSM/TSM zGood automation bus costly for smaller sites zNo server for free OS’s (Linux, FreeBSD...) zData integrity dependent on a database y“Good” tapes are worthless if database is compromised

Amanda zA backup manager, not a backup program zManages native backup programs zFreeware zTapes are in native format zTape library support (extensible)

Amanda... zOptimizes daily tape usage yspreads full dumps across the backup cycle zOptimizes daily backup window yMultiple dumps in parallel to a holding disk zOptimizes tape speed/usage yKeeps tape streaming by feeding from the holding disk

Amanda... zEasy to add filesystems to backup list zEasy to add tapes to the tape cycle zEasy interactive restores from any client zCompression in software or hardware

Amanda - deficiencies zWindows support (smbtar) currently a kludge zNo Mac support zNo tape spanning or appending

Amanda - advantages zShare tapes with non-AFS backups zMultiple backups in parallel zAutomated error recovery zDegraded mode - tape errors don’t stop the whole show

Advantages... zFree, runs on any unix zSupports for tape libraries zKeeps high capacity tapes streaming

Implementation zUse ‘backup dump’ or ‘vos dump’ ? zVolume sets? zDumpdates equivalent

Implementation... zNeeded functions yEstimate yBackup yIndex generation zRecovery ydumptool (Ken Hornstein) might be useful. Needs to run in a single pass so can be pipelined.