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- Path: sparky!uunet!math.fu-berlin.de!fub!tpki.toppoint.de!galki.toppoint.de!ulrich
- From: ulrich@galki.toppoint.de (Ulrich Gall)
- Newsgroups: comp.periphs.scsi
- Subject: Re: Two computers can access same SCSI bus?
- Message-ID: <725356151ulrich.term@galki.toppoint.de>
- Sender: term@galki.toppoint.de
- Date: Sat, 26 Dec 92 07:49:11 GMT
- References: <1992Dec22.214433.15146@spectra.com> <1992Dec28.010702.19921@seachg.uucp>
- Organization: Private UUPC OS/2 system near Kiel, Germany
- Lines: 36
-
- In article <1992Dec28.010702.19921@seachg.uucp> burke@seachg.UUCP (Michael Burke) writes:
- >In article <1992Dec22.214433.15146@spectra.com> ohumukin@spectra.com (Kawika Ohumukini) writes:
- >>I run a computer business and wanted to know if it is possible
- >>for two '384's to access the same SCSI disks (4 * 1.2GB)?
- >>
- >>Any information appreciated.
- >>
- >This question is raised from time to time.
- >
- >Yes, two (or more) systems can be on the same scsi bus as scsi disk and
- >tape drives. As long as the scsi requirements are met - cable lengths,
- >termination and type - the devices can share the scsi bus.
- I did this a year ago on a PC under DOS with AHA1542B.
- If you try it, remember to set one of the adaptecs to a different
- SCSI ID.
-
- >The question should be - Are there any O/S' that will allow the sharing of
- >file systems? It would not make sense for two hosts to go about treating
- >shared disks as if they owned the device. Data would be destroyed pretty
- >quickly.
- DOS worked perfect as long as there were no write accesses. Of
- course if one computer writes to disk, it messes up the other
- ones caches. I∩m not only talking smartdrive, but also buffers and
- AHA 1542B, and some kind of internal DOS buffer.
-
- >On the issue of tape devices, however, O/S' tend to give exclusive usage
- >to an application. In this way, tape drives can be shared much more easily.
- >
- >Disks can be best shared by having two (or more) partitions on a disk. Each
- >host "owning" it's own file system.
-
- I think the whole thing is interesting for sharing CD-ROMS.
-
- --
- Ulrich D. Gall, Seebrooksberg 2, W-2300 Klausdorf/Schw.
- EMail: ulrich@galki.toppoint.de, Phone: +49-431-790292
-