Date: Mon, 25 Aug 1997 22:16:25 +0200 From: Ollivier Robert <roberto@keltia.freenix.fr> To: current@FreeBSD.ORG Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it) Message-ID: <19970825221625.33901@keltia.freenix.fr> In-Reply-To: =?iso-8859-1?Q?=3C199708080650=2EIAA01405=40sos=2Efreebsd=2Edk=3E=3B_fro?= =?iso-8859-1?Q?m_S=F8ren_Schmidt_on_Fri=2C_Aug_08=2C_1997_at_08=3A50=3A1?= =?iso-8859-1?Q?5AM_%2B0200?= References: <Pine.BSF.3.96.970807231807.25546B-100000@shell.uniserve.com> <199708080650.IAA01405@sos.freebsd.dk>
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According to Søren Schmidt: > dd if=/dev/rwd0 of=/dev/null count=1600 bs=64k > 1600+0 records in > 1600+0 records out > 104857600 bytes transferred in 11.357939 secs (9232097 bytes/sec) Nice. Here are some data points as well. sd1 is an IBM DCAS 34330W (used here in narrow mode only), sd0 is a IBM DORS 32160; both are on the same ASUS SC-200. 237 [22:01] roberto@keltia:~> dd if=/dev/rsd1 of=/dev/null count=1600 bs=64k 1600+0 records in 1600+0 records out 104857600 bytes transferred in 12.850446 secs (8159841 bytes/sec) 237 [22:01] roberto@keltia:~> dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k 1600+0 records in 1600+0 records out 104857600 bytes transferred in 18.355968 secs (5712453 bytes/sec) The main advantages of SCSI are not in the "pure" speed of one or the other but mostly in my opinion in the ease of plugging and the hability to handle far more peripheral than your average IDE controller. I have 6 SCSI drives, two streamers (QIC-6150 & DAT) and a CD-ROM on 2 NCR controllers (that's for spreading the load) and that takes only two interrupts. I still have space for 5 other peripherals... Try to do this with IDE. Speed is not the name of the game here, it is extensibility (sp?), ease of use and versality. -- Ollivier ROBERT -=- FreeBSD: There are no limits -=- roberto@keltia.freenix.fr FreeBSD keltia.freenix.fr 3.0-CURRENT #24: Fri Aug 22 23:13:44 CEST 1997
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