Date: Fri, 6 Jun 1997 16:37:54 -0700 (PDT) From: asami@cs.berkeley.edu (Satoshi Asami) To: scsi@freebsd.org Subject: 3940uw with long cables Message-ID: <199706062337.QAA19597@vader.cs.berkeley.edu>
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Howdy, I've got a machine that has a bunch of disks -- unfortunately, some of the cables are quite long due to physical constraints (enclosures stacked on top of each other, etc.) I see the following kind of errors when the probe reaches one of the longer cables: === Probing for devices on PCI bus 3: ahc4 <Adaptec 3940 Ultra SCSI host adapter> rev 0 int a irq 11 on pci3:4 ahc4: aic7880 Wide Channel A, SCSI Id=6, 16 SCBs ahc4 waiting for scsi devices to settle ahc4: target 0 Tagged Queuing Device (ahc4:0:0): "IBM OEM DCHS09Y 2424" type 0 fixed SCSI 2 sd28(ahc4:0:0): Direct-Access 8689MB (17796077 512 byte sectors) ahc4: target 1 Tagged Queuing Device (ahc4:1:0): "IBM OEM DCHS09Y 2424" type 0 fixed SCSI 2 sd29(ahc4:1:0): Direct-Access 8689MB (17796077 512 byte sectors) ahc4: target 2 Tagged Queuing Device (ahc4:2:0): "IBM OEM DCHS09Y 2424" type 0 fixed SCSI 2 sd30(ahc4:2:0): Direct-Access 8689MB (17796077 512 byte sectors) ahc4: target 3 Tagged Queuing Device (ahc4:3:0): "IBM OEM DCHS09Y 2424" type 0 fixed SCSI 2 sd31(ahc4:3:0): Direct-Access 8689MB (17796077 512 byte sectors) ahc4: target 4 Tagged Queuing Device (ahc4:4:0): "IBM OEM DCHS09Y 2424" type 0 fixed SCSI 2 sd32(ahc4:4:0): Direct-Access 8689MB (17796077 512 byte sectors) ahc4: target 5 Tagged Queuing Device (ahc4:5:0): "IBM OEM DCHS09Y 2424" type 0 fixed SCSI 2 sd33(ahc4:5:0): Direct-Access 8689MB (17796077 512 byte sectors) ahc4: target 8 Tagged Queuing Device (ahc4:8:0): "IBM OEM DCHS09Y 2424" type 0 fixed SCSI 2 sd34(ahc4:8:0): Direct-Access 8689MB (17796077 512 byte sectors) ahc4: board is not responding (ahc4:9:0): SCB 0x0 - timed out while idle, LASTPHASE == 0x1, SCSISIGI == 0xb4 SEQADDR = 0x42 SCSISEQ = 0x12 SSTAT0 = 0x5 SSTAT1 = 0x2 (ahc4:9:0): SCB 0: Immediate reset. Flags = 0x801 (ahc4:9:0): no longer in timeout ahc4: Issued Channel A Bus Reset. 1 SCBs aborted ahc4: board is not responding (ahc4:9:0): SCB 0x0 - timed out while idle, LASTPHASE == 0x1, SCSISIGI == 0xb4 SEQADDR = 0x42 SCSISEQ = 0x12 SSTAT0 = 0x5 SSTAT1 = 0x2 (ahc4:9:0): SCB 0: Immediate reset. Flags = 0x801 (ahc4:9:0): no longer in timeout ahc4: Issued Channel A Bus Reset. 1 SCBs aborted === Is this something that can be only cured by somehow shortening the cables? This is 2.2-stable, IBM U-W disks on Adaptec 3940UW (with 20MHz mode disabled). We have 14-disk enclosures stacked on top of each other. The cables inside the enclosures are about 10 feet total in my eyeball test. The external cables are either 2, 2 1/2, 3 or 3 1/2 feet long. It's only the 3 or 3 1/2 feet cables that give us problems. (Which is also very interesting, does 12 1/2 and 13 make *that* much difference?!?) Satoshi
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