From owner-freebsd-scsi Fri Jun 19 17:47:58 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id RAA11333 for freebsd-scsi-outgoing; Fri, 19 Jun 1998 17:47:58 -0700 (PDT) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from tempest.nac.net (tempest.nac.net [209.123.20.1]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id RAA11314 for ; Fri, 19 Jun 1998 17:47:56 -0700 (PDT) (envelope-from alex@nac.net) From: alex@nac.net Received: (qmail 21464 invoked from network); 19 Jun 1998 20:42:29 -0400 Received: from iago.nac.net (alex@209.123.20.5) by tempest.nac.net with SMTP; 19 Jun 1998 20:42:29 -0400 Date: Fri, 19 Jun 1998 20:47:40 -0400 (EDT) To: Simon Shapiro cc: Chris Parry , freebsd-questions@FreeBSD.ORG, freebsd-SCSI@FreeBSD.ORG Subject: RE: DPT support binaries - How to Setup In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Just some notes... > The DPT controller creates and manages RAID array in a manner totally > transparent to the (ANY) operating system. Say, you have 45 disk drives, ANY operating system that has a drive for the SCSI card. Like, remember the FreeBSD didn't have a driver for it until recently. > 1 RAID-0 array to be used for swap, /tmp, /var/tmp, /usr/obj, etc. > RAID-0 is very fast, but if any disk in the array fails, the whole > array will lose its data. For the indicated use, this is acceptable > to us (Remember, this is just an example). > We do not need an awful lot of space, but we need the speed of at > least 15MB/Sec, so we will use 6 drives here. Is this bright? Couldn't this panic the system in an event of a failure? > 1 Huge RAID-0 array to contain news articles. Again, we do not care if > we loose the article. This array needs to be big and as fast as > possible. We will use 33 disk drives here. Also, I think this is a bad idea; at least make three 11-drive arrays (RAID-0 is ok, but this way if you lose *1* disk, you don't lose the ENTIRE spool, only a third -- and, you lose no storage space). With news servers like breeze, this is very easy. > 1 Huge RAID-5 array to contain our E-mail. We need reliability and > capacity, so we will use 33 drives here. In reality, RAID-5 arrays > are not so effective at this size, but this is just an exadurated > example. You are putting news and mail on the same machine? > What does the DPT do in case of disk failure? Usually kernel panic on bootup, but thats irrelevant. > Typically, the user who buys a $3,000.00 disk controller, attaching it to The most expensive 3334/UDW is like $1800. > -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Atheism is a non-prophet organization. I route, therefore I am. Alex Rubenstein, alex@nac.net, KC2BUO, ISP/C Charter Member Father of the Network and Head Bottle-Washer Net Access Corporation, 9 Mt. Pleasant Tpk., Denville, NJ 07834 Don't choose a spineless ISP! We have more backbone! http://www.nac.net -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message