From owner-freebsd-questions Tue Apr 14 12:50:38 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA29014 for freebsd-questions-outgoing; Tue, 14 Apr 1998 12:50:38 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from frodo.epigram.com (gated.epigram.com [209.0.75.3]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id TAA28892 for ; Tue, 14 Apr 1998 19:50:27 GMT (envelope-from brandon@epigram.com) Received: from epigram.com (berio [10.100.100.31]) by frodo.epigram.com (8.8.5/8.8.5) with ESMTP id MAA10262 for ; Tue, 14 Apr 1998 12:50:27 -0700 (PDT) Message-ID: <3533BDAF.A8588F53@epigram.com> Date: Tue, 14 Apr 1998 12:49:03 -0700 From: Brandon Huey Reply-To: bh@epigram.com Organization: Epigram, Inc. X-Mailer: Mozilla 4.04 [en] (X11; I; FreeBSD 2.2.6-RELEASE i386) MIME-Version: 1.0 To: freebsd-questions@FreeBSD.ORG Subject: RAID performance/benchmarking Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG **cross-posted in freebsd-scsi Dell PowerEdge 4200/300, 96MB RAM, 3 9GB Seagate Barracuda SCA drives DPT PM3334UW w/64MB cache FreeBSD 2.2.6 DPT kernel options: DPTOPT DPT_MEASURE_PERFORMANCE DPT_FREELIST_IS_STACK i created an array group with the dos util 'dptmgr' from default settings. using IOZONE and Bonnie, i create a 128MB file for read/write benchmarking. i am aware of the performance implications of RAID-5, but I am getting about 2MByte/sec max write transfer rate compared with 19MByte/sec on reads. For a pci ultrawide controller, are these figures suspect? What kind of write performance hit should one expect w/RAID-5 ? Thanks, -bh -- Brandon Huey Epigram, Inc. bh@epigram.com +1 408 720 3027 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message