1 04/07/83 tape_archive.changes
 2 
 3 This info describes changes to the tape_archive utility.
 4 
 5 
 6 Version 4, MR10.2:
 7 
 8 o  independent densities for primary and alternate volume sets are
 9    supported.  A new optional control argument '-alternate' may be
10    specified on the 'ta alter table density N' request to indicate
11    which volume set density is to be changed.
12 
13 o  all mount requests issued by tape_archive contain a '-density'
14    argument to enable the system to choose an appropriate tape drive
15    in a mixed hardware configuration.  It is currently possible (but
16    not likely) for a tape_archive volume set to actually be recorded
17    at a density different from that specified in the table.  With
18    version 4 the recording density in the table MUST match the
19    corresponding volume set density.  If problems are encountered in
20    this area, the actual recording density of a volume set can be
21    determined using the read_tape_and_query utility and the tape
22    archive table can be brought into step using the 'ta alter table
23    density N' request.
24 
25 
26 o  'xd' and 'xdf' requests have been added which extract a component
27    and then delete it from the tape archive.
28 
29 o  the 'cancel' request can correctly reinstate components dead
30    components which have been processed as deleted but are still on
31    the volume set.
32 
33 o  the 't' request produces header information when -long is
34    specified and the table is empty.
35 
36 
37 o  an auto_compaction limit of 1.0 is handled correctly and never
38    causes automatic scheduling of volume set compaction.
39 
40 o  'r'-type requests issued for a non-existent table proceed by
41    creating the table with a warning.
42 
43 o  extra checks have been added to prevent the deletion of the active
44    tape_archive table out from under current processing.
45 
46 o  redundant tape mounts have been eliminated by only writing the
47    tape_archive table to tape if the volume set has in fact changed.