Date: Fri, 14 May 1999 01:29:02 -0700 From: David Greenman <dg@root.com> To: Adrian Filipi-Martin <adrian@ubergeeks.com> Cc: Harold Gutch <logix@foobar.franken.de>, freebsd-advocacy@FreeBSD.ORG Subject: Re: time for another upgrade? Message-ID: <199905140829.BAA08679@implode.root.com> In-Reply-To: Your message of "Fri, 14 May 1999 04:21:38 EDT." <Pine.BSF.4.05.9905140349080.6313-100000@thneed.ubergeeks.com>
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>On Thu, 13 May 1999, Harold Gutch wrote: > >> On Thu, May 13, 1999 at 02:23:42PM -0400, Adrian Filipi-Martin wrote: >> > >> > I was showing the I/O stats page for ftp.cdrom.com to someone, and >> > it's quite amazing. Does anyone have a total on the daily bandwidth over >> > the last few days. Has it broken 1TB/day yet? >> > >> 1024^3 > 86400*10^8 > > Not quite. Assuming you meant 1024^4, you are still mixing units. >Asumnig 10 bits to transmit a byte, you only get 86400*10^7 bytes per day. > >> >> There's no way to achieve 1TB/day with fast ethernet - and above >> I'm assuming a constant stream of 100MBps with no protocol >> overheads. Take all this into account and you're left with even >> less :). > > I was under the impression that the new machine was on gigabit >ethernet. As you correctly point out it is impossible to do 1TB on 100Mbps >ethernet. In fact you cannot even do the 969GB/day cited in the upgrade >press release. 969*2^30*10/86400 == 120,423,128bps. This agrees with what >the stats pages are reporting today. Wrong, sort of. GB = 1 billion bytes in this case, not 2^30. [implode:dg] bc bc 1.03 (Nov 2, 1994) Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. scale=10 100000000/8 12500000.0000000000 12500000*60*60*24 1080000000000 ...or 1.08 trillion bytes. With 7% global packet loss, plus 3% packet overhead (which includes layer 2 and layer 3/4 overhead), the result is about 970GB. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org Creator of high-performance Internet servers - http://www.terasolutions.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-advocacy" in the body of the message
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