From owner-freebsd-isp Mon Aug 26 11:27:53 1996 Return-Path: owner-isp Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id LAA00675 for isp-outgoing; Mon, 26 Aug 1996 11:27:53 -0700 (PDT) Received: from mx.serv.net (mx.serv.net [199.201.191.10]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id LAA00670 for ; Mon, 26 Aug 1996 11:27:48 -0700 (PDT) Received: from MindBender.serv.net by mx.serv.net (8.7.5/SERV Revision: 2.30 † id LAA12368; Mon, 26 Aug 1996 11:27:18 -0700 (PDT) Received: from localhost.HeadCandy.com (michaelv@localhost.HeadCandy.com [127.0.0.1]) by MindBender.serv.net (8.7.5/8.7.3) with SMTP id LAA16542; Mon, 26 Aug 1996 11:27:01 -0700 (PDT) Message-Id: <199608261827.LAA16542@MindBender.serv.net> X-Authentication-Warning: MindBender.serv.net: Host michaelv@localhost.HeadCandy.com [127.0.0.1] didn't use HELO protocol To: Joe Greco cc: winter@jurai.net (Matthew N. Dodd), freebsd-isp@freebsd.org Subject: Re: Anyone using ccd (FreeBSD disk striper) for news In-reply-to: Your message of Mon, 26 Aug 96 11:22:47 -0500. <199608261622.LAA00478@brasil.moneng.mei.com> Date: Mon, 26 Aug 1996 11:27:01 -0700 From: "Michael L. VanLoon" Sender: owner-isp@freebsd.org X-Loop: FreeBSD.org Precedence: bulk >> Um... Isn't the DPT stuff "real raid"? >Guess you can play with words, but in my opinion, not if it's just a >controller... a real RAID includes little things like hot swappability, >redundant power, things that require hardware. ;-) >I thought when I looked at the DPT stuff it was just a controller like the >Adaptec 3985 "RAID" controller, but had some cache RAM on it too. Of course, if it is just a controller, there simply is no way to do hot swap. But the controller itself will also do automatic fail-over to standby drives, automatically filling the fail-over with data and bringing it on-line when ready. But, if you buy DPT's SmartRAID drive chassis to go along with the card, you got full hot swap, automatic fail-over, redundant power supplies (and fans), etc. This goes along with the controller's own ability to do automatic fail-over to standby drives, with or without the case, automatic temperature alarms, S.M.A.R.T. technology for predicting drive failures on SCSI drives that support S.M.A.R.T., and its use of ECC memory (if you buy ECC). Of course, you probably need some driver support for all this, so there's no guarantee the Linux driver will support it all, but... It's really pretty cool stuff. ----------------------------------------------------------------------------- Michael L. VanLoon michaelv@MindBender.serv.net --< Free your mind and your machine -- NetBSD free un*x >-- NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3, Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32... NetBSD ports in progress: PICA, others... -----------------------------------------------------------------------------