Re: Using the new bad-block-log in md for Linux 3.1

[Lutz Vieweg <lvml@5t9.de>]

On 07/27/2011 02:44 PM, John Robinson wrote:
>> Can you describe the criteria for MD considering a block as faulty?
>
> I'll try to answer this having followed some of the discussion around it.

Thanks a lot for the explanation!

> Once the controller or power issues are resolved, the bad block list can be
> administratively modified or cleared.

Ah, that's good.

> I don't think mdadm knows whether its constituent devices are SSDs.

In block/cfq-iosched.c I see a test that looks like this:
>         if (blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag)
>                 return;

If that isn't conclusive, putting a note into the mdadm man-page is probably
the best one can do.

Regards,

Lutz Vieweg