On Sun, Jul 06, 2003 at 09:36:56AM -0700, Scott Petler wrote: > Hi, > I am using amanda to back up to a hard disk on my system and would > like to protect the backed up disk from accidental erasure. I thought > one way to do this would be to mount it then run amdump, and then umount it. > The disk is going to be vulnerable during the backup period, but "safe" > when not doing a backup or recover. > > Is there a way to do this? Or are there some permission settings that > would prevent a rm -rf /* as root from erasing all of the backup disk?
In general, permissions are not checked for root. So I doubt any setting of permissions would help. Even root can not modify a file on a file system mounted read-only. You could mount it rw during backup, ro other times. The advantage to mounting it ro is that you can still do recoveries from the backed up data. Putting umount/mount commands in your cron might work. I'd be worried that the umount and mount would fail if something had a file open on that file system. Some mount commands (possibly FS type specific) may have an option to do a "remount". This option may let you change the properties of the mount without affecting open files. Note, I said "may let you", I've never tried it. -- Jon H. LaBadie [EMAIL PROTECTED] JG Computing 4455 Province Line Road (609) 252-0159 Princeton, NJ 08540-4322 (609) 683-7220 (fax)
