question on vinum

[secmgr]

Marko Raiha wrote:

>Hi,
>
>On Tue, Oct 26, 2004 at 11:33:43PM -0600, secmgr wrote:
>  
>
>>...
>>when you define the subdisk, don't use the whole drive.  Leave at least
>>64 blocks unused.
>>...
>>    
>>
>
>Would you mind to tell the reason behind this rule of leaving at least
>64 blocks unused?
>
>Regards,
>  
>
The reason is empirically derived.  When I created a 7 disk raid 5 set 
using "len 0" or all the space available, the raid set would be corrupt 
after initializing.  Every time.  When I reserved back  that extra 
space, no corruption.
(freebsd 4.10-p3)  There was a thread on this a few days ago.

jim