Re: mdadm "hang", 100% CPU usage when trying to create RAID-1 array with external bitmap

[Tomasz Chmielewski <mangoo@wpkg.org>]

On 15.07.2010 07:45, Neil Brown wrote:

(...)

>> access("/mnt/src/bitmap", F_OK)         = -1 ENOENT (No such file or directory)
>> open("/mnt/src/bitmap", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 3
>>
>>
>
> Hmm... that's rather embarrassing.
> This patch should fit it.  Or you can explicitly set a bitmap chunk size -
> aim for several megabyte.
>
> Thanks for the report,
> NeilBrown
>
> diff --git a/bitmap.c b/bitmap.c
> index beef2dc..44a8677 100644
> --- a/bitmap.c
> +++ b/bitmap.c
> @@ -373,7 +373,7 @@ int CreateBitmap(char *filename, int force, char uuid[16],
>   		 */
>   		chunksize = DEFAULT_BITMAP_CHUNK;
>   		/*<<20 for 2^20 chunks,>>9 to convert bytes to sectors */
> -		while (array_size>  (chunksize<<  (20-9)))
> +		while (array_size>  ((unsigned long long)chunksize<<  (20-9)))

It works fine with that patch applied, thanks a lot!


-- 
Tomasz Chmielewski
http://syneticon.net