On 31/01/2022 19:21, Phil Turmel wrote:

On 1/31/22 14:07, Geoff Back wrote:

quoted

If a disk has one or more bad sectors, surely the only logical action is
to schedule it for replacement as soon as a new one can be obtained; and
if it's still in warranty, send it back.  If the data is valuable enough
to warrant use of RAID (along with, presumably, appropriate backups)
surely it is too valuable to risk continuing to use a known faulty disk?

In which case, I would suggest that dangerous experiments that try to
force the disk to reallocate the block are arguably pointless.

Just my opinion, but one that has served me well so far.

Regards,

Geoff.

I would be surprised if you got warranty replacement just for a few 
re-allocated sectors.  The sheer quantity of sectors in modern drives 
and the tiny magnetic domains involved means **no** drive is error-free. 
  Just most defects are identified and mapped out before shipping. 
Reallocations cover the marginal cases.

You've also missed the point that the drive IS NOT FAULTY.

We're trying to trigger a *deliberate* fault on the new drive, when the 
copy from the old (faulty) drive failed ...

If raid does a successful read from the new drive, it will corrupt the 
raid data ...

Cheers,
Wol