maxgroupid(5) maxgroupid(5) NAME maxgroupid - replicated volume number allocation mechanism DESCRIPTION The system control machine (SCM) has a file(1,n), /vice/vol/maxgroupid, which contains the maximum replicated (aka group) volume number that has ever been allocated in(1,8) the system. This is used as a simple way to guarantee that group volume numbers are unique. Replicated (or group) volume ids are allocated out of the same names- pace as replica ids and non-replicated volumes ids. The latter two types of ids have a 1 byte (8 bit) prefix to identify the server on which they are stored. We suggest using prefixes in(1,8) the range 00-7F for replicated volume ids, and prefixes in(1,8) the range 80-FF for other volumes. When initializing a system, put the number you wish to use for the first replicated volume in(1,8) /vice/vol/maxgroupid. For example, if(3,n) you wish to use 7f000000 as the first replicated volume, create /vice/vol/maxgroupid with the number 2130706432. FILES /vice/vol/maxgroupid on the SCM BUGS This file(1,n) should be salvaged, but it is not. Removing this file(1,n) (without reinitializing the whole system) is a recipe for disaster. Grave confusion will result if(3,n) group (or any other) volumes are created with the same number. SEE ALSO servers (5), createvol_rep (8) AUTHOR Jay Kistler, 1990, Created maxgroupid(5)