Date: Wed, 15 Nov 2000 03:55:30 +0100 (CET) From: Are Bryne <are.bryne@communique.no> To: freebsd-scsi@freebsd.org Subject: LVD SCA disk compatability with narrow SCSI-2 Message-ID: <Pine.BSF.4.05.10011150353100.9850-100000@rune.communique.no>
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[ Please keep are.bryne@communique.no cc'd. TIA. ] Hello, I am having problems using a Quantum IV LVD SCA 9GB disk with an Adaptec 2940UA PCI single channel SCSI-2 host adapter. The problem is sketched out below. What I really would like to know, is whether this setup can be reliably used in some sort of configuration, and whether anyone has succeeded in this respect. I have seen comments by Adaptec and other host adapter producers that try to discourage this kind of arrangement. I take it that there might be more to these comments than simple marketing efforts of their more advanced adapters? I am trying to connect the two using a 50 pin <-> 80 pin LVD adapter with upper (high) byte termination. The problem I am seeing is the spontaneous reboot of the computer. This happens at irregular, but usually quite short intervals after the slices have been mounted. Sometimes the computer can stay alive for an hour, with both massive reads and writes. The 2940 BIOS has been told to use asynchronous 3.3MB/s transfers. If I try using higher, synchronous rates, the reboots happen at the start of stage two or three of the boot process (boot1, or boot2). One end of the SCSI chain has an external SCSI-2 active terminator, the other is terminated passively by a tape streamer. I had the computer working reliably at the low speeds using an Adaptec 1542CF host adapter, but no such luck using the 2940. I've tried with only the host adapter and the Quantum disk on the SCSI chain, but that did not change anything. Hoping for some useful advice, regards, Are Bryne Communiqué DA Phone: +47 22 44 33 99 Postboks 9050 Grønland E-mail: admin@communique.no N-0133 Oslo URL: http://www.communique.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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