hardware question [2]: SATA RAID

[Matt Price]

On Fri, May 12, 2006 at 11:44:05AM -0400, Darryl Clarke wrote:
> On 5/12/06, Matt Price <matt.price at utoronto.ca> wrote:
> > Hi folks,
> >
> > space...  what I'd really LOVE to do is to have some (absolutely crucial)
> > partitions (/home, /usr, /etc) mirrored and other, less essential partitions
> > (/music, /videos) striped.

> Based on theory, you can do exactly as you stated. :)
> 
> If you create identical partitions on both drives, the mdadm tool can
> be used to create the different types of raid.
> 
> I'd try something like this:
> sda1:sdb1 / (19gb)
> sda2:sdb2 /home (80gb)
> sda3:sdb3 /storage (200gb)
> sda4:sda4 swap (1gb) * depending on your system, really...
> 
> Then using mdadm I would create a mirror of sda1:sdb1 (md0), sda2:sdb2
> (md1), and a stripe of sda3:sdb3 (md2), and enable both swap
> partitions seperately
> 
> You would effectively end up with a 19gb system, 80 gb home, and 400gb
> of 'storage'...

wow.  can I just say: linux rocks.  that is truly amazing.  

would it be possible to mix  this with LVM?  Say:
sda1:sda1 (tiny)
sda2:sdb2 (97gig)
sda3:sdb3 (200 gig)
sda4:sdb4 (2 gig) 

then set up sda1:sdb1 = md0 as /boot, mirrored
     	    sda2:sdb2 = md1 as LVM containing / and /home, mirrored
	    sda3:sdb3 = md2 as LVM containing /video and /audio, striped.  
Or maybe the sda3:sdb3 wouldn't be RAID'ed at all, but just a giant LVM	    

I guess I'm sort of thinking out loud here, os maybethe setup isn't perfect.
but in principle does such a mixture sound plausible?

Matt

     	    > 
> Of course, mixing raid types on the same drive might cause a
> performance hit, maybe it won't matter, I can't verify that though.
> 
> -- 
> ~ Darryl  ~ smartssa at gmail.com
> ~ http://darrylclarke.com
> 
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-------------------------------------------
Matt Price	    matt.price at utoronto.ca
History Department, University of Toronto
(416) 978-2094
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