From owner-freebsd-current Fri Apr 7 02:23:49 1995 Return-Path: current-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id CAA29846 for current-outgoing; Fri, 7 Apr 1995 02:23:49 -0700 Received: from gndrsh.aac.dev.com (gndrsh.aac.dev.com [198.145.92.241]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id CAA29837 for ; Fri, 7 Apr 1995 02:23:43 -0700 Received: (from rgrimes@localhost) by gndrsh.aac.dev.com (8.6.8/8.6.6) id CAA07043; Fri, 7 Apr 1995 02:23:10 -0700 From: "Rodney W. Grimes" Message-Id: <199504070923.CAA07043@gndrsh.aac.dev.com> Subject: Re: Label/slices : how to add a disk ? To: roberto@keltia.freenix.fr Date: Fri, 7 Apr 1995 02:23:09 -0700 (PDT) Cc: current@FreeBSD.org In-Reply-To: <199504062000.WAA02147@keltia.frmug.fr.net> from "Ollivier Robert" at Apr 6, 95 10:00:14 pm X-Mailer: ELM [version 2.4 PL23] Content-Type: text Content-Length: 2484 Sender: current-owner@FreeBSD.org Precedence: bulk > > Thanks to all... After a few miss from me, it now works. > > The whole process is not really user-friendly though :-( > > Anyway, the drive is a Conner and it seems very fast : > > Excerpts from iozone 2.01 : > > 16 512 1927723 2982616 > 16 1024 2957966 4036623 > 16 2048 3969470 4455360 > 16 4096 4373693 4464622 > 16 8192 5100911 4464622 > > with a peek at 6.5 MB/s ! > > 8 512 1913978 2974354 > 8 1024 2949840 3976821 > 8 2048 3976821 4382619 > 8 4096 4628197 4418690 > 8 8192 6547206 4382619 > > Boy I'm happy... Thanks for giving us a system like FreeBSD. It keeps on > amazing me. That is an amazing write speed!! How much memory is in this machine??? As a note to folks it really helps if you run one really long iozone job to find out about sustained transfer rate and to eliminate almost all of the buffer cache effects: (The 16MB limit on iozone auto is not high enough for 16MB machines, since the buffer cache can now get quite large). This is on a 16MB machine, P54C-90, NCR810 controller iozone 2.01: The buffer cache become ineffective at 8MB transfer size, but still skewed the numbers some (~200K/sec). 16 512 2681003 2725233 16 1024 2732167 2674325 16 2048 2721779 2704639 16 4096 2725233 2721779 16 8192 2739137 2749658 iozone 128 8192: IOZONE writes a 128 Megabyte sequential file consisting of 16384 records which are each 8192 bytes in length. It then reads the file. It prints the bytes-per-second rate at which the computer can read and write files. Writing the 128 Megabyte file, 'iozone.tmp'...53.343750 seconds Reading the file...51.906250 seconds IOZONE performance measurements: 2516090 bytes/second for writing the file 2585772 bytes/second for reading the file -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Custom computers for FreeBSD