Date: Wed, 12 May 1999 20:01:28 -0400 (EDT) From: Chuck Youse <cyouse@cybersites.com> To: Greg Lehey <grog@lemis.com> Cc: "Mark J. Taylor" <mtaylor@cybernet.com>, Matthew Jacob <mjacob@feral.com>, freebsd-hackers@FreeBSD.ORG, Jim Carroll <jim@carroll.com> Subject: Re: fsck and large file system Message-ID: <Pine.LNX.4.10.9905121956501.8130-100000@ns1.cybersites.com> In-Reply-To: <19990513092808.X89091@freebie.lemis.com>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.LNX.4.10.9905121956501.8130-100000>