Multiple hard disk failures - coincidence ?
Bernd Walter
ticso at cicely12.cicely.de
Sat Dec 18 13:18:54 PST 2004
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
bernd at bwct.de info at bwct.de
More information about the freebsd-hackers
mailing list