--- On Thu, 5/1/08, Kasper Sandberg <lkml@metanurb.dk> wrote:

From: Kasper Sandberg <redacted>
Subject: Re: Sharing disks amoung multiple software RAIDs
To: "Justin Piszcz" <redacted>
Cc: "Alex Davis" <redacted>, linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org
Date: Thursday, May 1, 2008, 9:39 PM
On Thu, 2008-05-01 at 08:50 -0400, Justin Piszcz wrote:

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On Thu, 1 May 2008, Alex Davis wrote:

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Is this a bad thing? I'm guessing that it is,

but I want independent

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confirmation before I spoke to someone I know

who's doing this.

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Thanks


    

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What is the use case, why would you want to do that?
I have seen people on the list do it before, for

example are you going to 

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be utilizing both raids at the same time?  If so, I

would advise against 

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it.

What is the reasoning?

I do this!

is this really bad? i would surely like a list of reasons
why..

I do it because.. well.. first off, it allows me to have
/boot on
different raidlevel than / or /home without extra disks.
secondly, it allows me to with the same disks use different
filesystems.. for instance, it allows me to have /home
encrypted with
dm-crypt, while still raided.. Not that i would mind
encrypting /
and /home as 1 partition, but it creates a whole slew of
issues with
having to create initrd and stuff..

I realize that performance probably suffers abit from this,
but well..
is there any stability or security wise risk? i mostly use
raid1 and
raid5 only..

I would guess if the RAIDs are heavily used simultaneously it could
cause the disk head actuators to jump around more, causing more wear
and tear.


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