Date: Thu, 29 Oct 1998 11:16:54 -0600 From: Karl Denninger <karl@Denninger.Net> To: "Matthew N. Dodd" <winter@jurai.net> Cc: Hallam Oaks <mlnn4@oaks.com.au>, "hackers@FreeBSD.ORG" <hackers@FreeBSD.ORG> Subject: Re: Multi-terabyte disk farm Message-ID: <19981029111654.A27715@Denninger.Net> In-Reply-To: <Pine.BSF.4.02.9810291202030.17054-100000@sasami.jurai.net>; from Matthew N. Dodd on Thu, Oct 29, 1998 at 12:06:15PM -0500 References: <19981029105943.A27659@Denninger.Net> <Pine.BSF.4.02.9810291202030.17054-100000@sasami.jurai.net>
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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
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