From owner-freebsd-isp Tue Nov 5 16:50:26 1996 Return-Path: owner-isp Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id QAA06066 for isp-outgoing; Tue, 5 Nov 1996 16:50:26 -0800 (PST) Received: from soda.CSUA.Berkeley.EDU (soda.CSUA.Berkeley.EDU [128.32.43.52]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id QAA06061 for ; Tue, 5 Nov 1996 16:50:21 -0800 (PST) Received: from localhost (richardc@localhost) by soda.CSUA.Berkeley.EDU (8.6.12/8.6.12) with SMTP id QAA12040; Tue, 5 Nov 1996 16:49:00 -0800 Date: Tue, 5 Nov 1996 16:48:59 -0800 (PST) From: Veggy Vinny To: Joe Greco cc: michaelv@MindBender.serv.net, isp@FreeBSD.org, chad@gaianet.net, johnnyu@accessus.net, mario1@PrimeNet.Com Subject: Re: /usr/obj size In-Reply-To: <199611052318.RAA07444@brasil.moneng.mei.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-isp@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk On Tue, 5 Nov 1996, Joe Greco wrote: > > On Tue, 5 Nov 1996, Joe Greco wrote: > > > > > > The reason I keep saying 2GB is because that seems to be the current > > > > "sweet spot" where the price per gigabyte is lowest, and the > > > > performanc is at least "good". > > > > > > For price, 2GB is your ticket. For performance, 1GB is (I have recently > > > paid the "premium" to get a dozen and a half ST-31055N's... ouch... it > > > hurts, but you get almost double the throughput for having spent about > > > 30% more than the 2GB drives would have cost). > > > > Hmmm, speaking about 2 GIG drives, the new Barracuda's are cheaper > > than the ST32550N, I wonder if any performance is sacraficed since it has > > half the cache but come in both UltraSCSI and UltraSCSI Wide versions. > > Never thought about it but 5 2 GIG drives are cheaper than a single 9 gig > > drive, I always thought the bigger the drive, the less the cost per > > megabyte. > > Think about this: > > Two drives each with half the cache of a larger drive have the same amount > of cache, total, as the larger drive. > > Two drives have twice the heads of a larger drive. > > Two drives do not cost too much more than the larger drive. Let us say it > costs 30% more. > > If you buy the larger drive and find it is too slow, you buy the two > smaller drives and then you have spent 130% more. (But you have an > additional drive.) Actually, the smaller drives are cheaper now. But I guess it depends on how much room you have left for your computer's pci slots for controller cards as well. > > > > Of course 7200RPM drives are faster. But, if you can buy an extra > > > > drive or two, and put that in the stripe set, with the money you save > > > > by going 5400RPM, that extra drive might just make up the difference > > > > in speed. So, to say it the other way around: no, you don't need > > > > 7200RPM drives. > > > > > > Yes. I will put a two-disk stripe of a pair of ST-31055N Hawk-2 drives > > > (9ms, 5400RPM, etc) up against a single ST-32550N Barracuda (8ms, 7200RPM) > > > any day and beat it by a fair margin. And relatively speaking, with the > > > 32550N's hovering around $650 and 31055N's around $320, tell me what > > > makes more sense to do :-) > > > > > > But I will grant that the 32155N's, in the low 5's are attractive too. > > > > Hmmm, I know I just asked this. but how does striping work and is > > it only for SCSI drives? > > Striping ("CCD") works on general disk devices. I have never tried it on > non-SCSI drives or with non-PCI controllers. Hmmm, where can I get more info on how to do CCD under FreeBSD? Vince GaiaNet Corporation - Unix Networking Operations - GUS Mailing Lists Admin