Path: utzoo!attcan!utgpu!watmath!att!tut.cis.ohio-state.edu!network!ucsd!orion.cf.uci.edu!uci-ics!zardoz!conexch!ccicpg!cci632!rit!tropix!moscom!ur-valhalla!uhura.cc.rochester.edu!rochester!bbn!csd4.milw.wisc.edu!cs.utexas.edu!uunet!bywater!scifi!njs From: njs@scifi.UUCP (Nicholas J. Simicich) Newsgroups: comp.sys.ibm.pc.rt Subject: Re: Backup info for RT Wanted Message-ID: <635@scifi.UUCP> Date: 22 Jul 89 04:44:59 GMT References: <12237@well.UUCP> Reply-To: njs@scifi.UUCP (Nicholas J. Simicich) Organization: Nick Simicich, Peekskill, NY Lines: 41 In article <12237@well.UUCP> gors@well.UUCP (Gordon Stewart) writes: > >Hello, I am trying to figure out how to do regular backups on >an IBM RT running AIX 2.2.1. I would like to use "backup" format >since it appears to be much faster than tar, as well as having an >incremental backup system built into the command. I can't seem >to give the backup command more than one volume to back up at once. The backup command can back up files by name, in which case it can cross file systems, or it can back up file systems, either as images or by inode. The incremental mode is a file system backup, by inode as I recall. If you wanted to do a global backup of changed files, you'd have to make up a list of the files you wanted to back up, and back them up by name. >Nor does it appear to have a flag which allows incremental storage >on my tape. Is there any way of backing up several volumes to the >same tape? Yes, but only if you write all of the files before you reposition the tape. These tapes cannot be read or repositioned and then written to, and you can't append to a file. Now were you to run several backup commands in a row, you could write several successive files to the same tape. But this is not a property of the backup command. It is controlled by the device name. /dev/rmt0 rewinds after. /dev/rmt4 rewinds neither on open or close. /dev/rmt8 retensions before and rewinds after. /dev/rmt12 retensions before but does not rewind. If you were backing up a bunch of file systems, to a single tape, you might write the first file to /dev/rmt12, the intermediates to /dev/rmt4, and the last one to /dev/rmt0. > Does anyone out there have a script which controls the >level of your back up by the current date. I use a fancy tar driver, myself. (.....) -- Nick Simicich --- uunet!bywater!scifi!njs --- njs@ibm.com (Internet)