1 |
On Monday 24 March 2008, Enrico Weigelt wrote: |
2 |
> Hi folks, |
3 |
> |
4 |
> |
5 |
> does anyone know an (virtual) block device which can do automatic |
6 |
> defect management (if the underlying disks have badblocks) ? |
7 |
> |
8 |
> My idea goes like this: |
9 |
> * one or more devices are assigned to one block device |
10 |
> * a bunch of spare blocks are reserved for defect management |
11 |
> (so the device looks smaller than the sum of assigned disks) |
12 |
> * if an badblock is detected, it's automatically remapped |
13 |
> to an spare block |
14 |
> |
15 |
> In fact, just what drive-internal defect manangement does, but |
16 |
> at OS / driver level. |
17 |
|
18 |
I don't see the point, unless you are dealing with drives that do not |
19 |
have defect management. |
20 |
|
21 |
What makes you think you can accomplish this result better than the |
22 |
firmware on the drive? It seems to me that if the drive firmware missed |
23 |
the opportunity to relocate the bad block, then your window of |
24 |
opportunity to do it in your code has long since passed. IOW, the OS |
25 |
code cannot possibly ever achieve it's design result. |
26 |
|
27 |
Just a thought, maybe you know some aspect of disks that I don't and can |
28 |
see where this would be useful. From where I sit, I can;t see any such |
29 |
use-case. |
30 |
|
31 |
|
32 |
-- |
33 |
Alan McKinnon |
34 |
alan dot mckinnon at gmail dot com |
35 |
|
36 |
-- |
37 |
gentoo-user@l.g.o mailing list |