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Old 04-23-2013, 02:11 AM   #1
Agena
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Registered: Apr 2013
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Booting from RAID under fakeraid.


Hey all,

I'm sorry if this is a stupid question, but I haven't been able to find a clear answer on my own.

I understand that to boot from a RAID partition under software RAID, it has to be RAID-1. I believe that with true hardware RAID, the boot partition can be any RAID level as the RAID hardware presents the array to the bootloader/OS as a single disk.

I'd like to know what the case is with fakeraid. If I use my motherboard's fakeraid controller (Intel ICH/Matrix) to set up the RAID, could I then boot Linux off a RAID-5 array, or does it still have to be RAID-1? I've seen things online that imply either answer...

Thanks for your help

Last edited by Agena; 04-23-2013 at 02:12 AM.
 
Old 04-23-2013, 08:37 PM   #2
jefro
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Not a stupid question at all.

To bypass limits, some people use small boot partitions. Then mount the normal system raid(x).

On boot, a computer has to be smart enough to load the amount of data required to access a raid. In hardware it is loaded after bios from the onboard hardware raid card or embedded. This type of raid usually doesn't care about the OS.

A fake raid is a strange device. It may or may not work with one version of OS. A live cd of Knoppix might see the raid correctly while a live Debian may not. I suggest people stay away from fake raids if they intend on updating. If you can, I'd think you'd be better off using normal channel devices and make a software raid or btrfs/zfs raid.
 
  


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