From owner-freebsd-performance@FreeBSD.ORG Wed Jun 18 16:10:03 2003 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B1D2937B401 for ; Wed, 18 Jun 2003 16:10:03 -0700 (PDT) Received: from mta1.lbl.gov (mta1.lbl.gov [128.3.41.24]) by mx1.FreeBSD.org (Postfix) with ESMTP id 037B843F85 for ; Wed, 18 Jun 2003 16:10:03 -0700 (PDT) (envelope-from j_guojun@lbl.gov) Received: from mta1.lbl.gov (localhost [127.0.0.1]) by mta1.lbl.gov (8.12.9/8.12.9) with ESMTP id h5INA0Iq004256 for ; Wed, 18 Jun 2003 16:10:00 -0700 (PDT) Received: from lbl.gov (gracie.lbl.gov [131.243.2.175]) by mta1.lbl.gov (8.12.9/8.12.9) with ESMTP id h5IN9xAs004253; Wed, 18 Jun 2003 16:09:59 -0700 (PDT) Sender: jin@lbl.gov Message-ID: <3EF0F146.86CE2F33@lbl.gov> Date: Wed, 18 Jun 2003 16:09:58 -0700 From: "Jin Guojun [DSD]" X-Mailer: Mozilla 4.76 [en] (X11; U; FreeBSD 4.7-RELEASE i386) X-Accept-Language: zh, zh-CN, en MIME-Version: 1.0 To: Chuck Swiger References: <20030614190033.7F0DE37B407@hub.freebsd.org> <20030615091254.M85497@bluhayz.org> <3EF0B507.2B1B6FDF@lbl.gov> <3EF0EE8D.8040806@mac.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit cc: freebsd-performance@freebsd.org Subject: Re: freebsd-performance Digest, Vol 4, Issue 7 X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Jun 2003 23:10:04 -0000 Chuck Swiger wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Jin Guojun [DSD] wrote: > [ ... ] > > But this seems to have different problem. At least write to RAID 1 requires > > twice bus bandwidth for soft RAID 1. So, read should be faster than write. > > But current read is 67 MB/s, write is 10 MB/s. Something is not working. > > What is the write performance to a bare hard drive? 60 MB/s. Multiple writes (3 or 4 drives) are maximized at 147 MB/s. > I'd expect your write performance to be somewhat higher, true, but your drives > read at 33 MB/s, and write at 15 MB/s, your write performance is nominal. If I got 30 MB/s on write, I would not complain at all. -Jin