11/09/89 set_volume_log Syntax as a command: set_volume_log VLNAME {-control_arg} Function: alters certain parameters that describe the contents of a volume log. Arguments: VLNAME is the name of the volume log. The volog suffix is assumed if not specified. Control arguments: -cons_sets SET_VALUE, -cs SET_VALUE Sets the number of consolidated dump volume sets to retain in the volume log whenever it is purged. The value of SET_VALUE may be a non-zero positive integer or the word "all" or the letter "a". A consolidated dump set is defined as all volumes that are used in one cycle of the consolidated volume dumper. By default all consolidated dump volumes are kept for each reload group. The default operation will result if the SET_VALUE is set to "all" or "a". See "Notes" section for further explanation of the rules on how volume sets are retained or purged. -incr_sets SET_VALUE, -is SET_VALUE sets the number of incremental dump volume sets to retain in the volume log whenever it is purged. The value of SET_VALUE may be a non-zero positive integer or the word "all" or the letter "a". An incremental dump set is defined as all volumes that are used in all cycles of the incremental volume dumper that take place between cycles of the consolidated volume dumper. By default all incremental dump volumes are kept for each reload group. The default operation will result if the SET_VALUE is set to "all" or "a". See "Notes" section for further explaination of the rules on how volume sets are retained or purged. -reload_groups N, -rg N sets the number of reload groups to N, where N>1. The default value, set at volume log creation, is 2. Notes: 1) All incremental volume sets are retained by default and are purged when the reload group they are in is purged. This default operation is set up when the volume log is created. This default operation can also be set with the following command line; set_volume_log VLNAME -is all -cs all -reload_groups 2 When the incr_sets value is a non-zero positive integer, then that number of incremental volume sets are retained. All other incremental volume sets are purged, even if they are in the current reload group. 2) All consolidated volume sets are retained by default and are purged when the reload group they are in is purged. This default operation is set up when the volume log is created and can also be set up with the following command line; set_volume_log VLNAME -is all -cs all -reload_groups 2 No consolidated volume sets are purged in the current reload group. Using the number of consolidated dump sets in all the reload groups, consolidated volume sets are purged from previous reload groups to satisfy the value given with the -cons_sets option if this value is a non-zero positive integer. 3) No incremental or consolidated volume set is retained if it exists outside of the configured number of reload groups. If it is desired to keep more consolidated or incremental volumes sets, the number of reload groups must be increased. Examples: 1. set_volume_log VLNAME -is 1 -cs 5 -reload_groups 8 This will be the result on the Wednesday before the consolidated dump of the eighth week assuming you are running less incremental runs than consolidated runs, consolidated runs are done once per day (M-F), and a complete is run on Saturday. group SA SN MN TU WD TH FR 1 |comp| 2 |comp| 3 |comp| 4 |comp| 5 |comp| 6 |comp| 7 |comp| |cons||cons||cons| 8 |comp| |incr||incr... |cons||cons| 2. set_volume_log VLNAME -incr_sets 5 -cons_sets 10 -reload_groups 8 This will be the result on the Wednesday before the consolidated dump of the eighth week assuming you are running less incremental runs than consolidated runs, consolidated runs are done once per day (M-F), and a complete is run on Saturday. group SA SN MN TU WD TH FR 1 |comp| 2 |comp| 3 |comp| 4 |comp| 5 |comp| 6 |comp| |cons||cons||cons| 7 |comp| |incr||incr||incr| |cons||cons||cons||cons||cons| 8 |comp| |------incr------||incr||incr... |cons||cons| 3. set_volume_log VLNAME -incr_sets 2 -cons_sets 10 -reload_groups 2 This will be the result on the Wednesday before the consolidated dump of the second week. The consolidated runs are done once per day (M-F) and a complete is run on Saturday. group SA SN MN TU WD TH FR 1 |comp| |cons||cons||cons||cons||cons| 2 |comp| |------incr------||incr||incr... |cons||cons| Notice that there are only 7 consolidated volume sets at this point in the week. This is restricted by the number of reload groups specified, ie, 2. If a full set of 10 consolidated dumps were desired at all times, then 3 reload groups must be configured as in the following example. 4. set_volume_log VLNAME -incr_sets 2 -cons_sets 10 -reload_groups 3 This will be the result on the Wednesday before the consolidated dump of the second week. Again, consolidated runs are done once per day (M-F) and a complete is run on Saturday. group SA SN MN TU WD TH FR 1 |comp| |cons||cons| 2 |comp| |cons||cons||cons||cons||cons| 3 |comp| |------incr------||incr||incr... |cons||cons| ----------------------------------------------------------- Historical Background This edition of the Multics software materials and documentation is provided and donated to Massachusetts Institute of Technology by Group BULL including BULL HN Information Systems Inc. as a contribution to computer science knowledge. This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology, Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell BULL Inc., Groupe BULL and BULL HN Information Systems Inc. to the development of this operating system. Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970), renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture for managing computer hardware properly and for executing programs. Many subsequent operating systems incorporated Multics principles. Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. . ----------------------------------------------------------- Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without fee is hereby granted,provided that the below copyright notice and historical background appear in all copies and that both the copyright notice and historical background and this permission notice appear in supporting documentation, and that the names of MIT, HIS, BULL or BULL HN not be used in advertising or publicity pertaining to distribution of the programs without specific prior written permission. Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc. Copyright 2006 by BULL HN Information Systems Inc. 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