[CentOS] Growing RAID5 on CentOS 4.6

Stephen Harris wrote:
>           A RAID-5 set can be expanded by adding extra drives. This
>           requires "restriping" the array which means (almost) every
>           block must be written to a different place.
>
>           This option allows such restriping to be done while the array
>           is online.
>   

thats also a very risky operation as its extremely difficult to make it 
restartable in case of a mishap during hte many-hours-long restriping 
operation.   I wouldn't undertake this on any production system without 
a full backup first.