1maxgroupid(5)                 File Formats Manual                maxgroupid(5)
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NAME

6       maxgroupid - replicated volume number allocation mechanism
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DESCRIPTION

10       The  system  control  machine  (SCM)  has a file, /vice/vol/maxgroupid,
11       which contains the maximum replicated (aka group)  volume  number  that
12       has ever been allocated in the system.  This is used as a simple way to
13       guarantee that group volume numbers are unique.
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15       Replicated (or group) volume ids  are allocated out of the same  names‐
16       pace  as  replica  ids  and non-replicated volumes ids.  The latter two
17       types of ids have a 1 byte (8 bit) prefix to  identify  the  server  on
18       which  they  are  stored.  We suggest using prefixes in the range 00-7F
19       for replicated volume ids, and prefixes in the range  80-FF  for  other
20       volumes.   When  initializing  a system, put the number you wish to use
21       for the first replicated volume in /vice/vol/maxgroupid.  For  example,
22       if  you  wish  to  use  7f000000 as the first replicated volume, create
23       /vice/vol/maxgroupid with the number 2130706432.
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FILES

26       /vice/vol/maxgroupid on the SCM
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BUGS

29       This file should be salvaged, but it is not.
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31       Removing this file (without  reinitializing  the  whole  system)  is  a
32       recipe  for  disaster.   Grave  confusion  will result if group (or any
33       other) volumes are created with the same number.
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SEE ALSO

36       servers (5), createvol_rep (8)
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AUTHOR

39       Jay Kistler, 1990, Created
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