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Date:      Thu, 10 Oct 2002 12:28:35 -0500
From:      Dan Nelson <dnelson@allantgroup.com>
To:        Attila Nagy <bra@fsn.hu>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: Sharing a SCSI bus between some computers
Message-ID:  <20021010172835.GA24603@dan.emsphone.com>
In-Reply-To: <Pine.LNX.4.44.0210101808560.3631-100000@scribble.fsn.hu>
References:  <Pine.LNX.4.44.0210101808560.3631-100000@scribble.fsn.hu>

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In the last episode (Oct 10), Attila Nagy said:
> Due to the lack of enough "networking power" I started to think about
> alternatives.
>
[ snip pic of SCSI RAID with 3 servers hanging off it ]
> 
> The question is: what will happen if BOX3 mounts the filesystem from
> the SCSI BOX RW and BOX[1-2] mount it RO?
> 
> In the case BOX[1-2] it is only necessary to read from the array,
> nothing more.

As long as BOX3 never writes data, you're okay.  The problem is that
BOX1/2 don't know when BOX3 has invalidated their cached data by
writing to the disk.  What you want is a shared-storage filesystem, and
there is no such thing for FreeBSD.

Considering you can get a gigabit ethernet NIC for under $50 and a
D-Link 4-port gigabit switch for $300, you might just want to plug the
RAID into BOX3, and have BOX1/2 NFS-mount it.

-- 
	Dan Nelson
	dnelson@allantgroup.com

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