Setting up gmirror

[Carl]

Wojciech Puchar wrote:
 > Andrew Falanga wrote:
>> Identical drive models so their sizes are the same.  Is this the
>> command, from gmirror(8), the one I'll want to use?
>>
>>     Create a mirror on disk with valid data (note that the last sector of the
>>     disk will be overwritten).  Add another disk to this mirror, so it will
>>     be synchronized with existing disk:
>>
>> 	   gmirror label -v -b round-robin data da0
> 
> add -s <very large value> like -s 1048576 to prevent splitting one request 
> on 2 disks.

I thought the -s option was only applicable when using "-b split" for 
the balancing algorithm. Does "round-robin" not mean simply alternating 
between the two disks without ever splitting requests?

What are the considerations in choosing between "load", "prefer", 
"round-robin", and "split" balance algorithms?

Carl                                             / K0802647