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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Hardware Raid + hot-replace failed disk
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> Suppose you have a system with multiple disks managed by a
> hardware RAID controller in a RAID5 of RAID6 configuration,

what is "RAID5 of RAID6"???

>
> To FreeBSD it will look like e.g. a single large drive.
>
> If you want to extend your disk space by plugging in an extra
> disk, the hardware RAID controller will probably detect it and
> add it in his management, but will it be seen by FreeBSD?

FreeBSD will see larger drive.

you then have to fix partition table (use bsdlabel -e)

fix c partition to be actually sized of whole drive, and then

a) add new partition(s) for new space
b) extend the size of last partition and use growfs

> How can you make the added disk-space available for FreeBSD.
> Can this be done without shutting down the system? How??

i don't think FreeBSD can be told to reget device info from controller 
when partitions of that device are mounted. but i may be wrong