Date: Thu, 1 May 1997 15:57:10 -0700 (PDT) From: craig@tuna.progroup.com (Craig W. Shaver) To: jin@george.lbl.gov (Jin Guojun[ITG]) Cc: hardware@FreeBSD.ORG Subject: Re: 53C875 UW SCSI-3 adapter Message-ID: <199705012257.PAA06341@tuna.ProGroup.COM> In-Reply-To: <199705012115.OAA10970@george.lbl.gov> from "Jin Guojun[ITG]" at May 1, 97 02:15:34 pm
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> > Under both 2.1.7 and 2.2.1, the 53C875 ultra-wide SCSI-III host adapter, made > by J Bond Computer Systems (JDC5075), has the same performance as the 53C825, > which is just a wide SCSI host adapter, about 18 MBytes/sec. > The disk drive I used are Seagate BARRACUDA 9 (ST19171W) , which seagate > claims that can go 40 MBytes in sychronous-transfer mode. How many drives do you have on the scsi buss? What did you use to test the speed? 18MB/sec sounds pretty good to me. > > Has someone experimented the throughput of 53C875 ultra-wide SCSI-III host > adapter with any wide or ultra-wide drives? > > -Jin > > I am using a 2940UW with 4 ST32171W drives on a Solaris 2.5.1 x86, with 1 drive as the boot drive, and the other 3 striped (32k) using disksuite 4.0. Bonnie gives me about 12MB/sec max on the striped drives. -- Craig Shaver (craig@progroup.com) (415)390-0654 Productivity Group POB 60458 Sunnyvale, CA 94088
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