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Full Discussion: RAID config
Operating Systems AIX RAID config Post 302224545 by bakunin on Wednesday 13th of August 2008 11:35:51 AM
Old 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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LEARN ABOUT NETBSD

mfi

MFI(4)							   BSD Kernel Interfaces Manual 						    MFI(4)

NAME

     mfi -- LSI Logic & Dell MegaRAID SAS RAID controller

SYNOPSIS

     mfi* at pci? dev ? function ?

DESCRIPTION

     The mfi driver provides support for the MegaRAID SAS family of RAID controllers, including:

	   -   Dell PERC 5/e, PERC 5/i, PERC 6/e, PERC 6/i
	   -   Intel RAID Controller SRCSAS18E, SRCSAS144E
	   -   LSI Logic MegaRAID SAS 8208ELP, MegaRAID SAS 8208XLP, MegaRAID SAS 8300XLP, MegaRAID SAS 8308ELP, MegaRAID SAS 8344ELP, MegaRAID
	       SAS 8408E, MegaRAID SAS 8480E, MegaRAID SAS 8708ELP, MegaRAID SAS 8888ELP, MegaRAID SAS 8880EM2, MegaRAID SAS 9260-8i
	   -   IBM ServeRAID M1015, ServeRAID M5014

     These controllers support RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 50 and RAID 60 using either SAS or SATA II drives.

     Although the controllers are actual RAID controllers, the driver makes them look just like SCSI controllers.  All RAID configuration is done
     through the controllers' BIOSes.

     mfi supports monitoring of the logical disks in the controller through the bioctl(8) and envstat(8) commands.

EVENTS

     The mfi driver is able to send events to powerd(8) if a logical drive in the controller is not online.  The state-changed event will be sent
     to the /etc/powerd/scripts/sensor_drive script when such condition happens.

SEE ALSO

     intro(4), pci(4), scsi(4), sd(4), bioctl(8), envstat(8), powerd(8)

HISTORY

     The mfi driver first appeared in NetBSD 4.0.

BSD
								  March 22, 2012							       BSD
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