LNX100 must be backed up only once a week because it will not change very often. LNX200 and LNX300 change more often and must be backed up daily. Because this environment uses a weekly dump cycle, the DAY and FREQUENCY options determine which days each dump class is dumped. The daily and weekly dumps are short-term dumps that are not be kept for long. Another dump class creates dumps monthly and keeps the dumps for three months. All of the dump classes have a STACK value of three to allow dumps from up to three volumes to be put on one dump tape. One is the default STACK value, meaning that no stacking will occur. The following commands define the dump classes.
DEFINE DUMPCLASS(DAILY AUTOREUSE FREQUENCY(0) -
RETENTIONPERIOD(3) STACK(3) UNIT(3480) VTOCCOPIES(0))
DEFINE DUMPCLASS(WEEKLY AUTOREUSE FREQUENCY(0) DAY(7) -
RETENTIONPERIOD(28) STACK(3) UNIT(3480) VTOCCOPIES(0))
DEFINE DUMPCLASS(MONTHLY AUTOREUSE FREQUENCY(28) DAY(1) -
RETENTIONPERIOD(90) STACK(3) UNIT(3480) VTOCCOPIES(0))If, for example, you have only two tape drives at your disposal, use the SETSYS command to set the maximum number of dumps that may be taken at any one time.
SETSYS MAXDUMPTASKS(2)