Date: Wed, 8 Aug 2001 09:57:23 -0700 (PDT) From: Linh Pham <lplist@closedsrc.org> To: Eric Veraart <eric@monkey-online.net> Cc: <freebsd-questions@freebsd.org> Subject: Re: ATA "pseudo" RAID controllers Message-ID: <Pine.BSF.4.33.0108080954010.12100-100000@q.closedsrc.org> In-Reply-To: <3B712CEE.5E3B3696@monkey-online.net>
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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
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