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64 Storage Management with DB2 for OS/390
Table 19. SMS Storage Classes for Recovery Data Sets
7.1.3 SMS Management Class
DB2 administrators may require several Management Classes for DB2 recovery
data sets. These Management Classes have different expiration and backup
requirements. Table 20 on page 65 shows five examples of Management Classes
for the DB2 recovery data sets. These are:
MCDBICD This Management Class is intended for image copy data sets
created daily. These data sets will expire after four days.
MCDBICW This Management Class is intended for image copy data sets
created weekly. These data sets will expire after 25 days.
MCDBICM This Management Class is intended for image copy data sets
created monthly and primary copies of the archive logs. These
data sets will expire after 365 days.
MCDBLV2 This Management Class is intended for secondary archive logs
and secondary image copy data sets. Using this Management
Class, these data sets will be migrated directly to level two.
MCDBACTL This Management Class is intended for active logs and BSDS
data sets. These data sets do not require SMS management.
Attribute SCDBIC SCDBICH SCDBARCH SCDBACTL
Direct response (MSEC) 10 5 10 5
Direct bias
Sequential response (MSEC) 10 5 10 1
Sequential bias
Sustained data rate (MB/sec) 10 20 20 40
Availability
a
a. Continuous=Duplexed or RAID Disk, Preferred=Array Disk, Standard=Array or Simplex Disk
Standard Continuous Continuous Continuous
Accessibility
b
b. If a device with Concurrent Copy capability is desired, specify Continuous or Continuous Preferred
Standard Standard Standard Standard
Guaranteed space No No No Yes
Guaranteed synchronous write No No No No
Cache set name
CF direct weight
CF sequential weight