# Re: clearing blocks wrongfully marked as bad if --update=no-bbl can't be used?

- From: Phil Turmel \<hidden\>
- Date: 2016-11-07 03:36:38 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2016/11/6633350
- Thread: https://ratatoskr.run/linux-raid/2016/10/6633249/t.md

```text
On 11/06/2016 08:13 PM, Marc MERLIN wrote:
> On Mon, Nov 07, 2016 at 11:16:56AM +1100, NeilBrown wrote:

>> Is this a 32bit system you are using?  Such systems can only support
>> buffered IO up to 8TB.  If you use iflags=direct to avoid buffering, you
>> should get access to the whole device.
> 
> You found the problem, and you also found the reason why btrfs_tools
> also fails past 8GB. It is indeed a 32bit distro. If I put a 64bit
> kernel with the 32bit userland, there is a weird problem with a sound
> driver/video driver sync, so I've stuck with 32bits.

Huh.  Learn something new every day, I suppose.  Never would have
thought of this.  Thanks, Neil.

Phil

```