Re: [linux-lvm] software RAID over LVM

[Austin Gonyou <austin@coremetrics.com>]

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I can think of MANY uses for this. The main one would be a relatively
cheap way of making a RAID0+1, or stripe of mirrors. If you don't have
any hardware to do this with, then software is next. It'd be nice to be
able to do this, for sure. You could even do 0+5, or something crazy
like that too.


On Tue, 2002-01-29 at 17:50, Kirby C. Bohling wrote:
> Paul,
> 
> 	I haven't done it.  I have done mirrors underneath, but I am
> curious what 
> is the reasoning and/or application.  The only thing I can think up is 
> so you can migrate your mirrors to faster drives easily.  However, 
> putting the mirror underneath should allow you to move off one mirror 
> onto another.
> 
> 	I don't believe that mirroring can be expanded like a filesystem
> can.  In 
> order to make the mirror bigger, you have to break the mirror as far as 
> I know.  So what are you planning on doing with it, or is it just "to 
> see if it could be done".
> 
> 	Thanks,
> 		Kirby
> 
> lvm@agilecat.mailshell.com wrote:
> > Hi all,
> > 
> > I understand the use of LVM over software RAID.
> > But is it possible to use software RAID ON TOP
> > of LVM?  For example, have a RAID-1 mirroring
> > array created from two logical volumes.
> > 
> > I've tried and it seems to be working.  Is
> > it safe to do this?  Any pitfalls?
> > 
> > Thanks!
> > 
> > Paul
> > 
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> 
> 
> 
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-- 
Austin Gonyou
Systems Architect, CCNA
Coremetrics, Inc.
Phone: 512-698-7250
email: austin@coremetrics.com

"It is the part of a good shepherd to shear his flock, not to skin it."
Latin Proverb

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