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- Path: sparky!uunet!tymix!tardis!olivea!decwrl!mips!swrinde!network.ucsd.edu!calmasd!gdh
- From: gdh@calmasd.Prime.COM (Gerald Hall)
- Newsgroups: comp.sys.sun.hardware
- Subject: Re: Sun's SCSI Target Addresses
- Message-ID: <4914@calmasd.Prime.COM>
- Date: 17 Aug 92 18:37:23 GMT
- References: <1992Aug14.043144.9990@i88.isc.com> <1992Aug17.151826.10568@emr1.emr.ca>
- Organization: Computervision, San Diego, CA
- Lines: 24
-
- In article <1992Aug17.151826.10568@emr1.emr.ca> craven@cg.emr.ca writes:
- >I would also like to know the mystery behind the addressing scheme of Sun's
- >SCSI disks.
-
- Making target 3 sd0 actually makes some sense to me in terms of
- internal and external drives on Sun workstations. Many of our external
- drives are not easily jumpered to change the drive target number
- and these are all set (with no jumpers) target 0. By making making
- the internal drive (most often the only drive) target 3 Sun has
- allowd the internal drive to be sd0 (pleasing most people who would
- think that if there is only one drive this is what it should be called)
- AND they have made it possible to add an external drive without jumpering
- or changing the target number from 0 and not conflict with the internal
- drive(s).
-
- What I don't understand is the LUN stuff. Is this used anywhere
- or is it just historical. The sd numbers on a Sun4 (not 4c and I have
- not yet seen the 4m) are really strange because of the provision
- for LUNs.
-
- --
- /
- / Jerry, CalmaSD UNIX SysAdmin, +1 619 587 3065
- /
-