Date: Thu, 16 Sep 1999 17:22:59 GMT From: "Giorgio Bozio" <webgio@hotmail.com> To: brad@baileylink.net, freebsd-scsi@freebsd.org Subject: RE: tandberg ns8 with on-board adaptec AIC-7890 Message-ID: <19990916172259.18001.qmail@hotmail.com>
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I don't know if they are on one scsi bus, actually they plug on different connectors on the motherboard and so have different cables. the motherboard manual states: ------ this motherboard has onboard 50-pin fast scsi connector for 8-bit scsi devices, 68-pin wide scsi cinnector for 16-bit scsi devices, and 68-pin ultra2 scsi connector for 32-bit scsi devices. IMPORTANT: the 68-pin wide scsi connector is always terminated and will only work as an end device. ... the onboard adaptec aic-7890ab chipset incorporates an advanced multimode i/o cell that supports both single-ended (SE) and ultra2 devices, the scsi bus platform performs at full ultra2 speed (up to 40 MB/sec in 8 bit mode and up to 80 in 16 bit mode) and extended cabling 12m. When the SE device is attached, the bus defaults to an SE speed and cable length. In mixed enviroment of Ultra2 and SE devices, the onboard host adapter can be coupled with adaptec aic-3860 transceiver chipset to bridge the compatibility gap. By dividing the scsi bus into indipendent SE and low voltage differential (LVD) segments, the transceiver chipset support legacy devices without limiting performance and cable lenght on the LVD segment. ------ I should check if the HD is on SE mode or auto switch with LVD. I think it's on SE, anyway, but not sure. The pc is colocated, I'm not able able to check right now. ciao Giorgio >Probably not. If I read correctly you use one SCSI bus. Every SCSI bus >should have 2 terminators, one on each end. I believe that the motherboard >controller will terminate one end automatically. It is advisable to either >terminate the last device and place it at the end of the cable or to use >and >external (preferably active) terminator. > >On a side note, I have heard that one would only need one terminator for >busses with cable length of less than 18 inches, personally I always use >two. > >BMG > >p.s. Please go easy on me if this is not exactly correct, SCSI busses have >changed a lot over the years. > > >tape and disk are both terminated, is this correct? > > > > > > > >Having gone though this myself recently...have a look at your >termination. > > > >On Thu, 16 Sep 1999, Giorgio Bozio wrote: > > > > > I'm trying to install a tandberg tape ns8 (fast-Scsi) on a pc with a > >asus > > > P2B-S motherboard that has a on-board adaptec AIC-7890. The >motherboard > >has > > > a quantum vicking II on (Ultra2 scsi) and has always worked fine. HD >is > >on > > > ID 0 and tape on ID 4. The problem I encountered is that approx. 1 out > >of 3 > > > boots (and reboots) the system hangs at the point when it says >"waiting > >15 > > > seconds for scsi devices to settle". I wonder if changing the >scsi_delay > > > setting in the kernel config and raising it would do any help. > > > Please help! > > > thank you, > > > Giorgio Bozio > > > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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