From owner-freebsd-isp  Fri Sep 20 00:18:50 1996
Return-Path: owner-isp
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id AAA25303
          for isp-outgoing; Fri, 20 Sep 1996 00:18:50 -0700 (PDT)
Received: from gargoyle.carpe.net (root@gargoyle.carpe.net [194.162.243.7])
          by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id AAA25263;
          Fri, 20 Sep 1996 00:18:45 -0700 (PDT)
Received: from helva.grefen.carpe.net (helva.grefen.carpe.net [194.162.243.129]) by gargoyle.carpe.net (8.7.4/8.7.3) with ESMTP id JAA04536; Fri, 20 Sep 1996 09:19:25 +0200 (MET DST)
Received: from hex.grefen.carpe.net (root@hex [194.162.243.130]) by helva.grefen.carpe.net (8.7.5/8.7.3) with ESMTP id JAA07099; Fri, 20 Sep 1996 09:21:21 +0200 (MET DST)
Received: from hex.grefen.carpe.net (grefen@localhost [127.0.0.1]) by hex.grefen.carpe.net (8.7.3/8.7.3) with ESMTP id JAA06410; Fri, 20 Sep 1996 09:21:19 +0200 (MET DST)
To: "David E. Tweten" <tweten@frihet.com>
Cc: FREEBSD-SCSI-L <freebsd-scsi@freebsd.org>,
        FREEBSD-CURRENT-L <freebsd-current@freebsd.org>,
        FREEBSD-ISP-L <freebsd-isp@freebsd.org>
Subject: Re: Streamlogic RAID array benchmarks 
Reply-To: grefen@carpe.net
In-reply-to: "David E. Tweten"'s message <199609191729.KAA06675@ns.frihet.com> of Thu, 19 Sep 96 10:29:20 PDT.
References: <199609191729.KAA06675@ns.frihet.com> 
Date: Fri, 20 Sep 1996 09:21:17 +0200
Message-ID: <6407.843204077@hex.grefen.carpe.net>
From: Stefan Grefen <grefen@carpe.net>
Sender: owner-isp@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

In message <199609191729.KAA06675@ns.frihet.com>  "David E. Tweten" wrote:
> grefen@carpe.net said:
> >I assume from your statements that they use the 3 disks as  "Data 
> >Data Parity" not as a 'true' RAID 5  "Data Data Data Data Parity" 
> >(this would have other side effects too). 
> 
> If I read this right, it is an interesting, though incorrect, 
> interpretation of the meaning of the various levels of RAID.

It didn't wanted to imply that the parity is always on the same disk.
As "Data Data Data Data Parity" on a 3 disk system rotes the parity through
the disks !!.

[...]

Stefan


--
Stefan Grefen                            Am Grossberg 16, 55130 Mainz, Germany
grefen@carpe.net                         +49 6131 998566   Fax:+49 6131 998568
Living on Earth may be expensive, but it includes an annual free trip 
around the Sun.