[luau] Software RAID (Donation of Oracle 9i Linux)

[Eric Hattemer]

There is little point.  I'm sure someone can think of an absurd situation in
which it might help, but its just interesting that the linux kernel allows
software raid on a partition by partition basis, even if the two partitions
are on the same drive.  Its actually quite useful in that you can set up 2
hard drives each with a linux partition and a windows partition, then set
linux to do software raid on it.  That's what I always do.  Windows software
raid takes over both hard drives, then requiers a third because it makes
them non-bootable.  Really a backup device beats any system of 1HD software
raid 1, but it might be fun to mess around with if you're bored.  Certainly
setting up software raid 0 can be fun on a desktop system, though.  That's
what I do, and I'm quite happy with it as long as redhat sets the DMA on (I
always have to force it on on two different motherboards because of its over
ambitious bad controller protection).

-Eric Hattemer
----- Original Message -----
From: "Brian Low" <brianl at royalstate.com>
To: <luau at videl.ics.hawaii.edu>
Sent: Thursday, August 15, 2002 3:23 PM
Subject: RE: [luau] Software RAID (Donation of Oracle 9i Linux)


> What would be the point of doing a RAID with 1 drive :)  You get 0
> redundency.
>
> Brian
>
>
> -----Original Message-----
> From: luau-admin at videl.ics.hawaii.edu
> [mailto:luau-admin at videl.ics.hawaii.edu]On Behalf Of Eric Hattemer
> Sent: Thursday, August 15, 2002 2:53 PM
> To: luau at videl.ics.hawaii.edu
> Subject: Re: [luau] Software RAID (Donation of Oracle 9i Linux)
>
>
> In litteral terms, you can do software raid on linux with 1 HD and two
> partitions.  However, it probably hurts performance, rather than
> improving
> it.  The multiple heads on a hard drive all line up vertically and scan
> what's called a cyllinder (multiple sectors stacked on top of each
> other).
> They cannot read two partitions at the same time.  You could test out
> software raid with two partitions, but I don't think you'd be too happy
> with
> it.  You can probably get RAID 1 going with a very slight advantage.  It
> won't save you in case your drive fails entirely, but if you start to
> get
> bad sectors or filesystem errors, at least your HD is backed up on
> another
> partition.
>
> -Eric Hattemer
>
> ----- Original Message -----
> From: "W. Wayne Liauh" <LiauhW001 at Hawaii.rr.com>
> To: <luau at videl.ics.hawaii.edu>
> Sent: Thursday, August 15, 2002 1:54 PM
> Subject: [luau] Software RAID (Donation of Oracle 9i Linux)
>
>
> > <Not really :)>
> >
> > Just thought that with the current advancement of multiple-head HDs,
> things might have changed.
> > But I suppose if someone can develop a new type of BIOS?
> >
> >
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