From owner-freebsd-hackers  Tue Mar  3 13:02:11 1998
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Date: Tue, 03 Mar 1998 13:08:48 -0800 (PST)
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Organization: The Simon Shapiro Foundation
From: Simon Shapiro <shimon@simon-shapiro.org>
To: Wilko Bulte <wilko@yedi.iaf.nl>
Subject: Re: SCSI Bus redundancy...
Cc: grog@lemis.com, hackers@FreeBSD.ORG, blkirk@float.eli.net, jdn@acp.qiv.com,
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On 03-Mar-98 Wilko Bulte wrote:
> As Simon Shapiro wrote...
>> 
>> On 02-Mar-98 Wilko Bulte wrote:
 ...

>> > 'Not everything that can be done should be done'
>> 
>> Right!!!
> 
> You must have tried it ;-)

I expanded this statement (a favorite of mine) in my mind to cover a wide
range of social, political, and interpersonal subjects.

> HP has something like this, but with a different implementation, I think
> it is called AutoRaid (?). They use RAID5 for 'cool' data and RAID1 for
> 'hot' data. This gives a nice compromise between cost (RAID1 is $$) and
> RAID5 (slower, especially on writes). They migrate between the raid
> levels
> based on data usage patterns. 

Check out {sendero,nomis}.simon-shapiro.org.  I have RAID-1 on the boot
images, RAID-5 on data I care about, /usr/obj and such on RAID-0.  Sonme of
these arrays are actually shared between nomis and sendero.  Hard to tell
which is which.

Migration happens using human prowess and the all powerful ``find . | cpio
-dump'' tool.

Simon


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