[CentOS] Software Raids Questions (I have only ever used hardware?)

>>> md (software raid mechanism or watever u wanna call it) allows u to
>>> grow so if your raid is formatted with an fs that allows u to grow,
>>> then u r good to go (lvm will allow u to grow).
>>>       
>> This was also my current belief, again thanks for confirming that.
>>     
> ----
> you will not be able to add more physical drives to an existing RAID-5
>   

You can since 2007 (mainline kernel 2.6.17) and therefore should be 
available in Centos 5.