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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IIR(4) BSD Kernel Interfaces Manual IIR(4)
NAME
iir -- Intel Integrated RAID controller and ICP Vortex driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device pci
device scbus
device iir
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
iir_load="YES"
DESCRIPTION
The iir driver claims to interface with the Intel integrated RAID controller cards, and all versions of the ICP Vortex controllers (including
FC).
HARDWARE
Controllers supported by the iir driver include:
o Intel RAID Controller SRCMR
o Intel Server RAID Controller U3-l (SRCU31a)
o Intel Server RAID Controller U3-1L (SRCU31La)
o Intel Server RAID Controller U3-2 (SRCU32)
o All past and future releases of Intel and ICP RAID Controllers.
o Intel RAID Controller SRCU21 (discontinued)
o Intel RAID Controller SRCU31 (older revision, not compatible)
o Intel RAID Controller SRCU31L (older revision, not compatible)
The SRCU31 and SRCU31L can be updated via a firmware update available from Intel.
SEE ALSO
cam(4), pass(4), xpt(4), camcontrol(8)
AUTHORS
The iir driver is supported and maintained by Achim Leubner <Achim_Leubner@adaptec.com>.
This manual page was written by Tom Rhodes <trhodes@FreeBSD.org> and is based on information supplied by the driver authors and the website
of Mike Smith <msmith@FreeBSD.org>.
BSD
August 8, 2004 BSD