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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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