Mailinglist Archive: opensuse (2391 mails)
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Re: [opensuse] Suse 10.3 install - oh dear
- From: "Brian K. White" <brian@xxxxxxxxx>
- Date: Fri, 9 May 2008 14:54:26 -0400
- Message-id: <00f101c8b206$1acc6590$6b00000a@venti>
----- Original Message -----
From: "Per Jessen" <per@xxxxxxxxxxxx>
Sent: Friday, May 09, 2008 1:13 PM
Subject: Re: [opensuse] Suse 10.3 install - oh dear
How do you define "unraid" ? You probably didn't change theI split the discs and reset the bios to none raid etc.
When you said "fake RAID" I took it to mean "Linux MD RAID"
Why would you think that? Google fake raid.
It means the type of raid that is neither purely software nor purely hardware.
It's when the bios of a motherboard or firmware of a drive controller (same
thing) povides just enough hooks for a boot loader or kernel that knows how to
use that particular fake-raid controller to get started booting. It does not
actually perform any raid work though, the real work is all done in software
similarly to "linux md raid" except it usually has to take place right within
in a drive controller driver, not as a seperate layer on top of any drive
conroller driver the way md raid works.
It's called fakeraid because the box simply says it's a raid controller, same
as real raid cards, yet it performs almost no raid functions itself.
FreeBSD has support for some controllers that do this, And linux did for a
while in 2.4, but it was dropped in 2.6
The recommendation is to always disable the raid feature in any fake-raid
controllers and use the controller as a plain controller, and do any raid using
You lose a few hardware-raid capabilitis and features that way, such as having
the raid present one virtual disk which can have partitions and mbr within the
raid volume, and booting directly from a raid 0/10/5/50 etc..
But the benefits are
* kernel developers don't waste time duplicating effort in multile places (md
raid, plus in various fakeraid drivers)
* you don't get stuck trying to use a buggy raid driver that wasn't implimented
as well as some other driver or isn't being maintained as well.
* md raid components can be assembled and used any where any time on any kind
of drive, any kind of controller, any kind of driver, after any kind of backup
or imaging backup & recovery. You don't need the original controller or driver
or even the type of drive in order to access data saved from failed hardware.
Brian K. White brian@xxxxxxxxx http://www.myspace.com/KEYofR
filePro BBx Linux SCO FreeBSD #callahans Satriani Filk!
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