[mythtv-users] Is my JFS broken ?

[Alex Butcher]

On Wed, 20 Aug 2008, Graham Wood wrote:

> One last check (that will probably take quite a while) would be to attempt to read the block
> device using dd - that'll tell you if the problem is with jfs or at a lower level.  Just "dd
> if=<block device> of=/dev/null bs=16M" and leave it running overnight ;)

That's correct, but read errors occur from time to time on
perfectly-serviceable discs; that's what spare blocks are for! All drives
that I've tested though, only remap failed blocks on a write attempt.

In this case, my money's on a) filesystem corruption by unclean
reboot/shutdown, b) a filesystem bug or c) wonky memory causing temporary or
permanent corruption.

> Graham

Bests Regards,
Alex.