Path: utzoo!attcan!seachg!db
From: db@seachg.uucp (David Bell)
Newsgroups: comp.periphs.scsi
Subject: Re: LUN on SCSI drives
Message-ID: <1991Mar4.185942.1554@seachg.uucp>
Date: 4 Mar 91 18:59:42 GMT
References: <1991Mar2.184349.1595@unixland.uucp>
Reply-To: db@seachg.UUCP (David Bell)
Organization: Sea Change Corporation, Mississauga, Ontario, Canada
Lines: 24

In article <1991Mar2.184349.1595@unixland.uucp> bill@unixland.uucp (Bill Heiser) writes:
>I'm kind of confused about the "LUN" on SCSI drives...  For 
>example, when I look at my drive configuration using scsicntl,
>it shows both a SCSI id and a LUN for each unit.  I don't see
>any documentation referring to LUN anyplace though.  Is that
>something different from SCSI id?  How is it configured?  I don't
>see any reference to it, at least in my CDC Wren manual (I'm still
>waiting for Maxtor to send me the manual for the 8760S.)
>
>

The SCSI spec allows up to 8 controllers on the bus, with SCSI id's from 0
to 7. Each controller may have up to four devices connected to it, with
Logical Unit Numbers from 0 to 3.

All devices that have built in SCSI controllers (such as the CDC Wren
drives) have a LUN of 0.

-- 
Dave Bell

Sea Change Corporation    
Mississauga, Ontario, Canada
UUCP: ...!uunet!attcan!seachg!db