From owner-freebsd-hackers Thu Oct 29 09:17:19 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA18755 for freebsd-hackers-outgoing; Thu, 29 Oct 1998 09:17:19 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from Genesis.Denninger.Net (kdhome-2.pr.mcs.net [205.164.6.10]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id JAA18750 for ; Thu, 29 Oct 1998 09:17:17 -0800 (PST) (envelope-from karl@Genesis.Denninger.Net) Received: (from karl@localhost) by Genesis.Denninger.Net (8.9.1/8.8.2) id LAA27750; Thu, 29 Oct 1998 11:16:55 -0600 (CST) Message-ID: <19981029111654.A27715@Denninger.Net> Date: Thu, 29 Oct 1998 11:16:54 -0600 From: Karl Denninger To: "Matthew N. Dodd" Cc: Hallam Oaks , "hackers@FreeBSD.ORG" Subject: Re: Multi-terabyte disk farm References: <19981029105943.A27659@Denninger.Net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: ; from Matthew N. Dodd on Thu, Oct 29, 1998 at 12:06:15PM -0500 Organization: Karl's Sushi and Packet Smashers X-Die-Spammers: Spammers will be LARTed and the remains fed to my cat Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, Oct 29, 1998 at 12:06:15PM -0500, Matthew N. Dodd wrote: > On Thu, 29 Oct 1998, Karl Denninger wrote: > > > You'd proably only see it in RAID5 mode or if you were -really- beating on > > > your array. Still, with that much memory they should make # of tags > > > supported a tunable. > > > > We beat the SHIT out of our arrays, and the big NFS servers run in RAID 5 > > mode :-) > > But how busy is the controller? 50%? More? Yeap. A good percentage of the time anyway. During backups (which are done hot!) it gets pounded even harder. > David G. would probably have more information on the CMD's low performance > modes. (Or rather modes where the limited number of taged commands begins > to impose limits on I/O) Hmmm..... I'd like to see that, actually. > > > I really want to find a cheap CRD-5440 just for kicks. 1 host and 2 disk > > > channels is just right for a small server. > > > > Yep. Actually, the 5440 has 4 channels :-) ~$2500 or so. > > Ya, reading skills help. $2500 is still a bit out of my price range for > home use. Maybe when I can second hand them in a few years. :) Yep. I'd buy one for my home network too, but that's a big pricey. I like having the "best and fastest", but not THAT badly :-) I am nutty enough though to do swappable carriers with temperature control in each (via a sensor, control CPU and dual fans - IN the carrier) :-) The disks run at a near-constant 42 degrees centigrade case temperature ;-) -- -- Karl Denninger (karl@denninger.net) http://www.mcs.net/~karl I ain't even *authorized* to speak for anyone other than myself, so give up now on trying to associate my words with any particular organization. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message