08-13-2008
Now, that it becomes clearer what ou want to do, i'd strongly suggest you dont do that. Keep in mind that to create a RAID from several disks is not only a feat the controller does but also the accompaning driver layer. This means that the machine would have to boot from a device which only comes into existence due to the work of a loadable piece of software (the driver) which is stored on the device it tries to make function - a circulus vitiosus, so to say.
Therefore i doubt that it is even possible to boot from a RAID device, but even if it is - don't do it and spare yourself some nightmare. Consider the following, not too farfetched situation: you upgrade the system and upgrade the driver software, which in turn makes the RAID unmountable for some or other software glitch. There is a BIG difference between having a system, which runs but is unable to mount its data storage and a system which is completely unbootable because the most core FSes won't mount, in fact even the kernel image cannot be loaded.
Do yourself a favour and make two disks a mirror, where the system software resides (rootvg) and the other four disks use as a RAID array.
I hope this helps.
bakunin
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ATARAID(4) BSD Kernel Interfaces Manual ATARAID(4)
NAME
ataraid -- ATA software RAID support
SYNOPSIS
device ata
device ataraid
DESCRIPTION
The ataraid driver provides support for so-called software RAID (sometimes referred to as fake RAID or pseudo RAID).
When a controller that supports software RAID is instructed to create a RAID array, its BIOS writes data structures in a specific metadata
format to the disks. These data structures are picked up by the ataraid driver, so that FreeBSD can work with the array. The ataraid driver
has to understand the specific metadata format of a controller BIOS in order to support its RAID capabilities.
Read-only support for a metadata format means that FreeBSD can use the given RAID array for normal read/write operations. Creation and
rebuild of such arrays has to be done from the controller BIOS.
Read and write support for a metadata format means that FreeBSD can use the given RAID array for normal read/write operations. Additionally,
the atacontrol(8) utility can be used to create, rebuild, update and fail such RAID arrays.
The ataraid driver can read the following metadata formats:
o Adaptec HostRAID
o Highpoint V2 RocketRAID
o Highpoint V3 RocketRAID
o Intel MatrixRAID
o Integrated Technology Express (ITE)
o JMicron
o LSI Logic V2 MegaRAID
o LSI Logic V3 MegaRAID
o NVIDIA MediaShield
o Promise FastTrak
o Silicon Image Medley
o Silicon Integrated Systems (SiS)
o VIA Tech V-RAID
o FreeBSD PseudoRAID
The ataraid driver can write the following metadata formats:
o Highpoint V2 RocketRAID
o Intel MatrixRAID
o JMicron
o Promise FastTrak
o Silicon Integrated Systems (SiS)
o VIA Tech V-RAID
o FreeBSD PseudoRAID
It is also possible to use software RAID on controllers that do not have special software RAID capabilities. See atacontrol(8) for details.
FILES
/dev/ar* ATA RAID device nodes
SEE ALSO
ata(4), atacontrol(8)
CAVEATS
RAID5 is not supported at this time. Code exists, but it neither uses nor maintains parity information.
AUTHORS
The ataraid driver was written by Soren Schmidt <sos@FreeBSD.org>. This manual page was written by Christian Brueffer
<brueffer@FreeBSD.org>.
BSD
February 17, 2006 BSD