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Path: utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!dsinc!syd
From: syd@DSI.COM (Syd Weinstein)
Newsgroups: comp.unix.xenix,comp.unix.questions
Subject: Re: How many uids and gids are allowed in SCO Xenix?
Message-ID: <1990Jun28.165234.23491@DSI.COM>
Date: 28 Jun 90 16:52:34 GMT
References: <1990Jun28.031638.15931@cunixf.cc.columbia.edu>
Reply-To: syd@DSI.COM
Organization: Datacomp Systems, Inc.  Huntingdon Valley, PA
Lines: 19

chaiklin@cunixf.cc.columbia.edu (Seth Chaiklin) writes:
>I am runing SCO Xenix/386 2.3.1.  I am curious about whether there
>is a upper limit on uids and also a upper limit on group ids?
>How do people handle the growing number of uids? Do you fill in
>the lower values or just keep adding to the end?  Does it matter?
SCO, like most Unix's uses 16 bits for the uid and gid.  Thus
the upper limit is 16 bits.  However, when you start to network,
you will find some bugs re negative uid's in many Unix's so the
practical limit is 32767, not 65535 for the upper limit.

Since uid's and gid's should (must if NFS is used) be consistent
network wide on you LAN's, perhaps some very large sites might
find that constraining.  However, for most sites, I would think
that approximately 32000 uids and gid's is sufficient.
-- 
=====================================================================
Sydney S. Weinstein, CDP, CCP                   Elm Coordinator
Datacomp Systems, Inc.                          Voice: (215) 947-9900
syd@DSI.COM or dsinc!syd                        FAX:   (215) 938-0235