Date: Tue, 6 Mar 2001 05:29:30 -0600 From: Mike Meyer <mwm@mired.org> To: dxoch <dxoch@escape.gr> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Backup + Dump + floppies = problem! Message-ID: <15012.51738.570582.604164@guru.mired.org> In-Reply-To: <3AA4C35A.E20BA517@escape.gr> References: <3AA4C35A.E20BA517@escape.gr>
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dxoch <dxoch@escape.gr> types: > Hi there, > After reading the Handbook and other resources i came to the > conclusion that dump is maybe the most reliable solution for > making backups on a FreeBSD Box.I also understood that is > much better to perform the backup procedure on unmounted > filesystems. But... Actually, there's no difference between performing the backup procedure on an unmounted file system vs. one that's inactive - so long as it's really inactive. The best way to insure that it's inactive is to have it be unmounted, or mounted read-only. Having the system in single-user mode is a very close second. > I dont want to use a spare hard disk to boot from, because it > is not practical, and i have boxes that can not boot from > a CDROM. So, in order to perform a backup with dump, i must > use floppies... Is there some reason you can't boot single user and back up the root file system before remounting it read/write? > I used the kern and mfsroot floppies in order to boot and run > the sysinstall program. Then I chooosed fixit from the menu > and i inserted the fixit floppy. Then I came into the following > situation: > > 1) Fixit floppy does not contain the dump program. > 2) Fixit floppy is more than full, df gives: > /dev/fd0 1363 1305 -51 104% /mnt > 3) After removing view and ex, df again gives: > /dev/fd0 1363 1305 -51 104% /mnt > and dump cannot be added. > 4) All files (exept dirs) in the fixit floppy have the same > size of 1215072 bytes. The original sizes are: > dump: 331452, view: 279876, ex: 279876 > 5) Fixit floppy cannot be unmounted (So that I can use an > other floppy) > 6) The kern floppy is also super-full, but files in it have > arbitrary sizes. df gives: > /dev/fd0 1407 1353 -58 105% /mnt > > My questions are: > - Is it OK for a floppy to be more than 100% full? Yes. See the FAQ. > - Can I add or remove files on the fixit floppy and how? Yes. You removed view and ex. Since those are hard links to vi, all you did was free a couple of inodes without releasing any blocks on the disk. > - Can I unmount the fixit floppy somehow, when i am in > the fixit shell? Try "umount -f". Expect things to fail afterwards. > - Is there an easier/better way to do some/all of the above? Yes. Just shut the system down to single user mode, unmount your file system, then dump them. If you're even more paranoid than I am, reboot to single user and dump root before remounting it read/write. Oh yeah - dump root last. > - Does anybody know a way to exclude a directory when using > dump to backup a filesystem. I didnt found anything helpfull > in the man pages. The only way I know to do it is to put the directory on another file system. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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