Gmirror question

[Tom Judge]

Guido van Rooij wrote:
> On Wed, Oct 25, 2006 at 11:34:25AM +0100, Tom Judge wrote:
>   
>> Guido van Rooij wrote:
>>     
>>> On Wed, Oct 25, 2006 at 11:07:14AM +0100, Tom Judge wrote:
>>>  
>>>       
>>>> Guido van Rooij wrote:
>>>>    
>>>>         
>>>>> Is it possible to use gmirror to mirror a single BSD partition?
>>>>> If not: is it possible with other tools?
>>>>>      
>>>>>           
>>>> Yes it is possible, I found this site had very good examples of setting 
>>>> it up:
>>>>
>>>> http://people.freebsd.org/~rse/mirror/
>>>>
>>>>    
>>>>         
>>> This only documents how to set it up on an entire disk or on a slice.
>>>
>>> -Guido
>>>       
>> The instructions for mirroring a slice can be modified slightly (by 
>> using the correct devices) to do mirror a single partition. 
>>     
>
> Please tell me then how these modified instructions look.
> I still do not know how to reserve the last sector of the partition. 
> I can create 1-sector holes using bsdlabel, but I'm not sure this
> would be the way to go...
>
> -Guido
>   

Please read Patricks reply to your earlier post re reserving blocks.

--SNIP--

You don't need to.

If your bsdlabel partition is N sectors in size, the gmirror
object will have size N - 1. Newfs will not be able to write
to that last sector. You newfs the finished mirror device,

--SNIP--

Tom 
not the individual partitions.