From owner-freebsd-questions Wed Aug 8 10: 0: 0 2001 Delivered-To: freebsd-questions@freebsd.org Received: from q.closedsrc.org (ip233.gte15.rb1.bel.nwlink.com [209.20.244.233]) by hub.freebsd.org (Postfix) with ESMTP id 470F737B410 for ; Wed, 8 Aug 2001 09:59:57 -0700 (PDT) (envelope-from lplist@closedsrc.org) Received: by q.closedsrc.org (Postfix, from userid 1003) id 4A06D55407; Wed, 8 Aug 2001 09:57:23 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by q.closedsrc.org (Postfix) with ESMTP id 3A70651610; Wed, 8 Aug 2001 09:57:23 -0700 (PDT) Date: Wed, 8 Aug 2001 09:57:23 -0700 (PDT) From: Linh Pham To: Eric Veraart Cc: Subject: Re: ATA "pseudo" RAID controllers In-Reply-To: <3B712CEE.5E3B3696@monkey-online.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On 2001-08-08, Eric Veraart scribbled: # On http://www.freebsd.org/releases/4.2R/notes.html it says: # # "The ata(4) driver now has support for tagged queueing, which is enabled # by the ATA_ENABLE_TAGS option. It also supports the ServerWorks ROSB4 # ATA33 chipset, the CMD 648 ATA66 and CMD 649 ATA100 chipsets, and the # Cyrix 5530. It also has support for ATA "pseudo" RAID controllers, # including the Promise Fasttrak and HighPoint HPT370 controllers" # # What are "pseuo" RAID controllers? Is it that it can access the # harddisks, but won't support RAID functionality or is it that the RAID # functionality is controlled by the controller and no software or driver # is needed for the RAID functionality? I think the term "'pseudo' RAID controllers" refer to RAID controllers that don't really do any of the computation or processing, but rather rely on software and/or the system processor to do all of the processing. 3Ware and Adaptec provide 'hardware' ATA RAID controllers that have a microprocessor sitting on the RAID card itself that handles parts/most/all of the I/O processing. I could be wrong though :) -- Linh Pham [lplist@closedsrc.org] // 404b - Brain not found To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message