Date: Thu, 13 Jun 2002 02:19:44 +0200 From: Bernd Walter <ticso@cicely5.cicely.de> To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: sync cache Message-ID: <20020613001944.GC80030@cicely5.cicely.de> In-Reply-To: <200206121850.g5CIoXB26742@uriah.heep.sax.de> References: <3CFEC5F4.2070003@webvolution.net> <20020606110101.GU66505@cicely5.cicely.de> <200206121850.g5CIoXB26742@uriah.heep.sax.de>
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On Wed, Jun 12, 2002 at 08:50:33PM +0200, Joerg Wunsch wrote: > Bernd Walter <ticso@cicely5.cicely.de> wrote: > > > Even if they do not need the command they should have implemented > > it as a nop. > > Why? > > > Possibly this command is even required in recent SCSI specs. > > Such a lousy implementation does not create trust in firmware. > > Of course, since the entire concept of `cache memory' is optional > to the SCSI block device model, the implementation of SYNCHRONIZE > CACHE is optional as well. I have read the specs. It is still optional if the device has no write cache. This is not the case for a raid controller which allows the drives behind to have write cache enabled. I strongly hope the controller in question explicitly disables it. Nevertheless I would expect it to be available on any modern device. OK - I have to revert that it can be a nop if there is nvram based cache. -- 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-scsi" in the body of the message
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