Date: Sun, 2 Apr 2000 11:02:17 +0200 From: Bernd Walter <ticso@cicely.de> To: vova@express.ru Cc: Bernd Walter <ticso@cicely.de>, freebsd-fs@FreeBSD.ORG Subject: Re: SCSI bus Message-ID: <20000402110216.A24876@cicely8.cicely.de> In-Reply-To: <Pine.BSF.4.21.0003312359580.14919-100000@lanturn.kmost.express.ru>; from vova@express.ru on Sat, Apr 01, 2000 at 12:01:36AM %2B0400 References: <20000331215756.A19890@cicely8.cicely.de> <Pine.BSF.4.21.0003312359580.14919-100000@lanturn.kmost.express.ru>
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On Sat, Apr 01, 2000 at 12:01:36AM +0400, vova@express.ru wrote: > On Fri, 31 Mar 2000, Bernd Walter wrote: > > > > I have question about two SCSI controllers on one SCSI bus, > > > > > > I want to run following configuration: one FreeBSD with SCSI controler, > > > with mounted disks in read/write mode, and another FreeBSD with SCSI > > > controller on the same bus with mounted disks in read-only mode. > > > > > > So can two controllers correctly handle SCSI bus with FreeBSD drivers ? > > > (I mean aic78* controllers) > > > > I don't expect this to work because the readonly side can't know when the > > incore informations outdates. > > Yes, it can be a problem, but may be this may be solved by disabling any > cache on read-only side (or setting expire time in one sec) ? You can't diable readcaching completely. Say you need the inode, then you will read it and finaly use it. You don't reread it for every single byte you access which creates some kind of read cache. And there are much more complex points like this sample. -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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