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Date: Mon, 05 Feb 2007 10:34:45 -0600
From: Eric Anderson <anderson@freebsd.org>
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To: Indigo <indigo@voda.cz>
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Cc: freebsd-fs@freebsd.org
Subject: Re: Dumb filesystem idea
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On 02/04/07 16:11, Indigo wrote:
> Hello Everyone,
>    Im about to try a disklayout experiment and I wanted to ask everyone if
> Im trying things that are pointless or if I should extend the experiment
> somehow.
> 
> Hardware:
>    Highpoint RocketRAID 2320
>    2xWD Raptor 74GB
>    5xWD Caviar 320GB
> 
> Original idea for the setup:
>    74GB RAID1 (Raptors)
>     /,/var,/usr
>    50GB RAID0 (Caviars[10GB from each - maybe less])
>     swap,/usr/obj,/tmp,[/var/audit]
>    1TB+ RAID5 (Caviars[the rest])
>     /home (or just general storage)
> 
> The goal is to waste as few fast/reliable space as possible on things that
> CAN be lost and to generally reorganize the filesystem by file purpose.
> 
> Known issue is that I'll need some script to recreate the RAID0
> filesystems when they crash.
> 
> Am I onto something here? I feel like running in circles - it's dumb to
> put /var/obj on the RAID1 where it just eats valuable space. But it's also
> dumb to put things on a RAID0 where they will crash a running system in
> the event of disk failure. I know my idea won't work but I wanted to ask
> if anyone was playing with similar ideas.


It's not dumb - there's even been some lengthy discussion of this on the 
freebsd-geom@ list recently I believe.  Check the archives, and you can 
read up on nearly this exact scenario.


Eric