From owner-freebsd-hackers Wed May 12 18: 4:28 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from ns1.cybersites.com (unknown [207.92.123.2]) by hub.freebsd.org (Postfix) with ESMTP id 2DA3514C11 for ; Wed, 12 May 1999 18:04:26 -0700 (PDT) (envelope-from cyouse@cybersites.com) Received: from localhost (cyouse@localhost) by ns1.cybersites.com (8.9.3/8.9.3) with ESMTP id UAA08202; Wed, 12 May 1999 20:01:28 -0400 X-Authentication-Warning: ns1.cybersites.com: cyouse owned process doing -bs Date: Wed, 12 May 1999 20:01:28 -0400 (EDT) From: Chuck Youse To: Greg Lehey Cc: "Mark J. Taylor" , Matthew Jacob , freebsd-hackers@FreeBSD.ORG, Jim Carroll Subject: Re: fsck and large file system In-Reply-To: <19990513092808.X89091@freebie.lemis.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Whoa ... can anyone substantiate that this poor performance is typical or atypical of DPT SCSI RAID controllers? I was just about to drop $6000 on a DPT SmartRAID IV 64MB. . . Chuck Youse Director of Systems cyouse@cybersites.com On Thu, 13 May 1999, Greg Lehey wrote: > On Wednesday, 12 May 1999 at 15:18:22 -0400, Mark J. Taylor wrote: > > BTW: this system is getting VERY poor I/O performance, using the DPT SCSI RAID > > controller and three arrays of four 49 GB Seagate drives. "iozone" reports > > 340,000 bytes/sec write and 9,800,000 bytes/sec read. > > That's particularly bad. Which model was it? I've done some > comparisons with Vinum and found that the write performance of Vinum > (RAID-5) was round 25% of read performance, while it was below 10% on > the SmartRAID IV. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message