On Sun, Dec 19, 2004 at 08:07:20AM +1100, Peter Jeremy wrote: > On Sat, 2004-Dec-18 20:59:11 +0100, Bernd Walter wrote: > >On Sat, Dec 18, 2004 at 08:17:39PM +1100, Peter Jeremy wrote: > >> My approach to this is to add a line similar to > >> dd if=/dev/ad0 of=/dev/null bs=32k > >> for each disk into /etc/daily.local (or /etc/weekly.local or whatever). > >> This ensures that the disks are readable on a regular basis. > > > >Regular reading of every file is part of what I call backup. > > That only verifies the used part of the disk. Reading the unused parts
That's true - used parts are the only I'm interested in reading. If blocks fail that aren't used write reallocation has to do it's job. > of the disk as well helps reduce surprises. Also, in a mirrored environment, > the backup does not ensure that the data can be read off both disks. > (Or the parity area for RAID-5). Raid is another story. Just dd'ing the disks wouldn't check redundance integrity, but if you check the integrity why would you still want to check via dd too? -- B.Walter BWCT http://www.bwct.de [EMAIL PROTECTED] [EMAIL PROTECTED] _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
