Service name
Storage Management Subsystem


For z/OS Releases
V1R2 and above


Description
The Storage Management Subsystem (SMS) service is a pure supporting service. It cannot be customized, but it offers update requests that can be used by other services to make definitions in the SMS control data sets (source and active). It also offers selective data that it retrieves from the SMS source control data set during the 'Refresh' task which can be accessed in read-only mode by other services.
Note:
The SMS service accesses various ISPF libraries based on volsers that it retrieves from the management directory. If you moved the ISPF libraries, for example by cloning your system, the SMS service will fail, unless you have created a new product home based on the original one to reflect the volser changes in the management directory.
Note:
Ensure that the values for LOG_PAGES_PRIMARY_QUANTITY and LOG_PAGES_SECONDARY_QUANTITY are set to a value larger than 0. This is done in the panel ISPCCONF. Otherwise the SMS service will fail.
Note:
To successfully share SMS control data sets in a multisystem environment where there are mixed levels of DFSMS:
Update, translate, validate, and activate SMS policies on the system with the highest level of DFSMS. You must perform the following on the system running the highest release level of DFSMS:
Define or update your SMS constructs and ACS routines. Translate your ACS routines. Validate your SCDS.


Policies Supplied
None


Refresh Actions
 
System resources accessed during Refresh Authorization Required
Selected entries are retrieved from the SMS source control data, including:
  • a flag indicating whether SMS is active or not
  • a list of all defined data classes
  • a list of all defined storage classes
  • a list of all defined storage groups and a list of all containd volumes for each storage group
READ authority for the SMS source control data set (SCDS).


Update Actions Performed by this Service
None


Update Requests Offered by this Service
 
Update action System resources Updated Authorization Required
The following objects/settings are defined or modified:
  • data class
  • storage class
  • storage group
  • add volume to storage group
The SMS source control data set (SCDS) and active control data set (ACDS).
  • UPDATE authority for the SMS source control data set (SCDS)
  • ALTER authority for the SMS active control data set (ACDS)
Note:
The updates that are applied to the SMS source control data set (SCDS) are activated by using the SETSMS command during the Commit step. This copies the definitions from the SCDS to the active control data set (ACDS).