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 2 
 3 :Info: backup.gi: 02/04/82 backup
 4 
 5      There are two types of backup:  hierarchy backup and volume
 6 backup.
 7 
 8      The hierarchy backup system dumps (copies) user segments and
 9 directories onto removable storage (magnetic tape).  The dumping
10 is conventionally done using the processes Backup.SysDaemon and
11 Dumper.SysDaemon.  The information dumped can be recovered by the
12 operations staff at the user's request.
13 
14      A backup system operates at the physical storage volume level.
15 It provides physical volume rebuilding in the event of a failure, as
16 well as segment and subtree retrieval.  See the enter_retrieval_request
17 command.
18 
19 
20 :Info: bit_count.gi: 02/04/82 bit count
21 
22      An index to the last bit of useful information in a segment.  For
23 example, a segment that contains 43 characters starting at the
24 beginning has a bit count of 387 (9*43).  (A segment may, however,
25 contain useful data independent of its bit count.) See the
26 set_bit_count and adjust_bit_count commands.
27 
28 
29 :Info: blocked.gi: 02/04/82 blocked
30 
31      The state a process is in when it is not executing and is waiting
32 for some event to occur (such as the user typing a command line).
33 
34 
35 :Info: bound_segment.gi: 02/04/82 bound segment
36 
37      A group of (usually related) object segments bound into one
38 object segment to save space and speed up references (calls, etc.)
39 between them.  The process of binding segments is similar to linkage
40 editing on other systems and is done by use of the bind command.
41 
42 
43 :Info: branch.gi: 02/04/82 branch
44 
45      An item cataloged in a directory: segment, multisegment file or
46 another directory but not a link.