Date: 11 Jul 1996 10:14:32 +0100 From: mark@plato.ucsalf.ac.uk (Mark Powell) To: freebsd-scsi@freebsd.org Subject: Does Adaptec 7880 Ultra support simultaneous wide and narrow transfers? Message-ID: <m0ueHpV-00036uC@viking.ucsalf.ac.uk>
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Hi, I have a motherboard with a built in 7880 Ultra with a narrow and a wide connector surface mounted. I have a Conner CFP4207S on the narrow channel with TERM/PWR enabled and a Conner CFP4207W on the wide channel with TERM/PWR enabled. I wanted to move my FreeBSD-2.1-stable filesystem from the narrow disk to the wide. I assumed that I could simply copy all the data over with (narrow on sd0, wide on sd1; with 512k on board data buffer): $ dd if=/dev/sd0c of=/dev/sd1c bs=512k However, this only yields data transfer rates in the 200K/s range. I've tried both larger and smaller buffer sizes with no apparent increase. I'm beginning to wonder if the 7870 chipset is performing these transfers simultaneously. I would expect such a command to push both drives at full speed with the drive access lights on solidly. However, the drive lights are alternating off/no for around 1 sec. periods. Am I expecting the wrong thing here? If I turn on WIDE negotiation for the W drive, the kernel enables 16bit transfers: ahc0 <Adaptec aic7880 Ultra SCSI host adapter> rev 0 int a irq 11 on pci0:18 mapreg[10] type=1 addr=00006000 size=0100. mapreg[14] type=0 addr=f2000000 size=1000. ahc0: BurstLen = 8DWDs, Latency Timer = 32PCLKS ahc0: Reading SEEPROM...done. ahc0: aic7880 Wide Channel, SCSI Id=7, 16 SCBs Reseting Channel A ahc0: Downloading Sequencer Program...Done ahc0: Probing channel A ahc0: target 0 synchronous at 10.0MHz, offset = 0xf (ahc0:0:0): "CONNER CFP4207S 4.28GB 1524" type 0 fixed SCSI 2 sd0(ahc0:0:0): Direct-Access 4096MB (8388608 512 byte sectors) sd0(ahc0:0:0): with 3999 cyls, 20 heads, and an average 104 sectors/ track ahc0: target 1 using 16Bit transfers ahc0: target 1 synchronous at 10.0MHz, offset = 0x8 (ahc0:1:0): "CONNER CFP4207W 4.28GB 1524" type 0 fixed SCSI 2 sd1(ahc0:1:0): Direct-Access 4096MB (8388608 512 byte sectors) sd1(ahc0:1:0): with 3999 cyls, 20 heads, and an average 104 sectors/ track ahc0: target 2 synchronous at 10.0MHz, offset = 0x8 (ahc0:2:0): "HP C1533A 9503" type 1 removable SCSI 2 st0(ahc0:2:0): Sequential-Access density code 0x24, variable blocks, write-enabled ahc0:A:4: refuses WIDE negotiation. Using 8bit transfers ahc0: target 4 synchronous at 4.4MHz, offset = 0xf (ahc0:4:0): "TOSHIBA CD-ROM XM-3701TA 0236" type 5 removable SCSI 2 cd0(ahc0:4:0): CD-ROM cd0(ahc0:4:0): NOT READY asc:4,1 cd0(ahc0:4:0): Logical unit is in process of becoming ready can't get the size 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 This effectively hangs the machine, requiring a reset. Whats wrong here? -- 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>
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