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- Path: sparky!uunet!gatech!gatech!kd4nc!n4hgf!wa4cyb!jmd
- From: jmd@wa4cyb.UUCP (John Dashner)
- Newsgroups: comp.unix.sysv386
- Subject: Re: SCSI controller board inquiry
- Message-ID: <2@wa4cyb.UUCP>
- Date: 11 Dec 92 12:33:44 GMT
- References: <1992Dec10.183131.19791@fcom.cc.utah.edu>
- Organization: John Dashner & Assoc.
- Lines: 32
- X-Newsreader: TIN [version 1.1 PL7]
-
- Jeff Thomas (jeff@anthro.utah.edu) wrote:
- : What's a good brand of SCSI controller that's ASPI compliant that will
- : work with both DOS5 and ISC UNIX? This is gonna go into a 386 ISA machine.
- : I'm planning to hook up an Archive 2150S SCSI tape drive and possibly a
- : SCSI disk.
-
- At my current client's location, we installed 9 BusLogic SCSI-2 compliant
- (note the keyword *compliant*) controllers in 3 486 50Mhz servers. The
- model number we installed is the KT-542B version for ISA buses (they have
- other models for MCA an EISA as well.) These controllers support up to
- 7 SCSI devices each of which can be up to 8 gigabyte drives (or tapes,
- CD-ROMs, whathaveyou) and provide appropriate mapping of cylinder geometry
- that avoids the BIOS hangup over 1024 cylinders. This of course does not
- matter for U*ix systems. They come with drivers for DOS, OS/2 and Netware
- as well as a replacement driver for ISC and SCO vintages.
-
- Above I noted that the device is SCSI-2 compliant -- this means that it
- supports the command set enhancements of SCSI-2 *but* may NOT necessarily
- support specific drives rated as SCSI-2 due to bandwidth limitations (I
- believe they will support up to 10 megabyte per second disk tranfers in
- burst mode. They will support up to 20 megabyte transfers over the ISA
- bus.) Typically, you're looking at a better controller for present SCSI
- devices. They also seem to have solved the memory addressing problem above
- 16 megabytes although I cannot confirm this as yet.
-
- You may have noted that was 9 controllers in 3 boxes. This is what can be
- supported on the ISA bus -- MCA and EISA will support four controllers.
-
- Y'all come on down and see a PC with 32 gigabytes of online disk storage
- when we get them all installed ;-)
-
- All the best, pappy
-