From owner-freebsd-scsi Tue Jan 4 14: 3:23 2000 Delivered-To: freebsd-scsi@freebsd.org Received: from turtle.looksharp.net (cc360882-a.strhg1.mi.home.com [24.2.221.22]) by hub.freebsd.org (Postfix) with ESMTP id 25F6A14C82 for ; Tue, 4 Jan 2000 14:03:14 -0800 (PST) (envelope-from bsdx@looksharp.net) Received: from localhost (bsdx@localhost) by turtle.looksharp.net (8.9.3/8.9.3) with ESMTP id RAA10155; Tue, 4 Jan 2000 17:03:04 -0500 (EST) (envelope-from bsdx@looksharp.net) Date: Tue, 4 Jan 2000 17:03:04 -0500 (EST) From: Adam To: Matthew Jacob Cc: scsi@FreeBSD.ORG Subject: Re: sym troubles In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org sapphire:/dev % cp /usr/src/etc/MAKEDEV . sapphire:/dev % ./MAKEDEV cd2 sapphire:/dev % ls -l cd* crw-r----- 1 root operator 15, 0 Jan 4 16:54 cd0a crw-r----- 1 root operator 15, 2 Jan 4 16:54 cd0c crw-r----- 1 root operator 15, 8 Jan 4 16:54 cd1a crw-r----- 1 root operator 15, 10 Jan 4 16:54 cd1c sapphire:/dev % ls -l rcd* crw-r----- 1 root operator 15, 0 Jan 4 16:54 rcd0a crw-r----- 1 root operator 15, 2 Jan 4 16:54 rcd0c crw-r----- 1 root operator 15, 8 Jan 4 16:54 rcd1a crw-r----- 1 root operator 15, 10 Jan 4 16:54 rcd1c sapphire:/dev % cd /root sapphire:/root % ./stuff /dev/rcd1c 2k 0 1000 I/O returned -1, err is Operation not supported by device sapphire:/root % ./stuff /dev/cd1c 2k 0 1000 I/O returned -1, err is Operation not supported by device sapphire:/root % dd if=/dev/rcd1c of=/dev/null bs=2048 count=2000 2000+0 records in 2000+0 records out 4096000 bytes transferred in 1.632706 secs (2508719 bytes/sec) dd'ing small counts doesnt seem to hint that it is caching any. Plextor's website thinks it has cache though, but dd causes the disk access light to light up each time as well as spinning up / keeping the disk spun up. On Mon, 3 Jan 2000, Matthew Jacob wrote: >Not if the xfer size is small enough such that it's held in the drive's >buffer, in which case the bus speed should show up. > > >> >semuta.feral.com > root rdsame /dev/rwd0c 2k 0 1000 >> >Read 2048000 bytes in 0.866316 seconds, 2308.63KB/sec in 2048 byte blocks >> >semuta.feral.com > root rdsame /dev/rwd0c 1k 0 10 >> >Read 10240 bytes in 0.6581 seconds, 1519.53KB/sec in 1024 byte blocks To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message