Date: Thu, 11 Jul 1996 09:27:42 -0700 From: "Justin T. Gibbs" <gibbs@freefall.freebsd.org> To: mark@plato.ucsalf.ac.uk (Mark Powell) Cc: freebsd-scsi@freebsd.org Subject: Re: Does Adaptec 7880 Ultra support simultaneous wide and narrow transfers? Message-ID: <199607111627.JAA08545@freefall.freebsd.org> In-Reply-To: Your message of "11 Jul 1996 10:14:32 BST." <m0ueHpV-00036uC@viking.ucsalf.ac.uk>
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>$ dd if=/dev/sd0c of=/dev/sd1c bs=512k dd is a linear program. It will read all 512k from the source then write all 512k to the destination then loop. You should ensure that 512k divides evenly into the total capacity of the drive too. You will probably see better performance if you use an 8 or 16k buffer. >If I turn on WIDE negotiation for the W drive, the kernel enables 16bit transf >ers: ... >However, the same command causes the following SCSI errors on the console: > >sd0(ahc0:0:0): timed out in dataout phase, SCSISIGI == 0x48 >ahc0: Issued Channel A Bus Reset #2. 2 SCBs aborted >sd0(ahc0:0:0): UNIT ATTENTION asc:29,0 >sd0(ahc0:0:0): Power on, reset, or bus device reset occurred field >replaceable unit: 14 When was the last time you updated your stable? This sounds like a bug I fixed on June 8th. >-- >Mark Powell - Senior Network Technician - Room: C806 >Computer Services Unit, University College Salford, Salford, Manchester, UK. >Tel: +44 161 745 3376 Fax: +44 161 736 3596 >Email: mark@ucsalf.ac.uk finger mark@ucsalf.ac.uk (for PGP key) ><A HREF="http://www.ucsalf.ac.uk/~mark/">Home Page</A> -- Justin T. Gibbs =========================================== FreeBSD: Turning PCs into workstations ===========================================
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