Chapter 3. Storage management subsystem environment
3.4 Preparing for DFSMShsm fast replication
3.4.2 Defining copy pool backup storage groups
Each pool storage group to be included in a copy pool must be associated with a CPBSG. The
copy pool backup storage group
(CPBSG) is designated as the target where the copies of the pool storage group will be kept. Usually, each storage group is associated with its own CPBSG.Tip: The copy pool fast reverse restore setting is saved at the time of the fast replication
backup. Therefore, when you change the copy pool setting at any time, the new setting will be used only for new fast replication backups. Settings for existing fast replication backups remain unchanged.
Tip: You can specify storage groups that are not yet defined in the Source Control Data Set
(SCDS), but this action makes the SCDS invalid for activation. The storage groups that are specified must be defined in the SCDS before you activate the configuration.
COPY POOL DEFINE Page 3 of 5
Command ===> SCDS Name . . : SYS1.SMS.SCDS Copy Pool Name : CP1 To DEFINE Copy Pool, Specify:
Storage Group Names: (specify 1 to 256 names) ==> SG1 ==> ==> ==> ==> ==> ==> ==> ==> ==> ==> Use ENTER to Perform Verification; Use UP/DOWN Command to View other Panels; Use HELP Command for Help; Use END Command to Save and Exit; CANCEL to Exit.
Define your copy pool backup definitions by selecting option 6 Storage Group - Specify
Volume Names and Free Space Thresholds from the ISMF Primary Option Menu as shown
in Figure 3-2 on page 31.
Figure 3-7 shows the Storage Group Application Selection panel.
Figure 3-7 Storage Group Application Selection panel
With the Storage Group Application Selection panel, you can perform the following tasks:
Specify the name for the CPBSG.
Specify the storage group type of copy pool backup.
Associate your existing source pool storage groups with the CPBSG where you want to keep your copies.
After you enter the chosen Storage Group Name and Storage Group Type of copy pool backup, select option 2 Define - Define a Storage Group.
When the CPBSG is defined, you also need to define volumes in it. You need to know which pool storage group must be associated with this CPBSG and the number of versions to keep for the pool storage group. The number of versions is defined in the related copy pool definition. For example, if your pool storage group contains 10 volumes and you want to keep two backup versions, the CPBSG must contain 20 target volumes.
If the pool storage group uses extended or overflow storage groups that are defined, you must also define target volumes for those storage groups. For example, if the pool storage group with 10 volumes has an overflow storage group with five volumes, you must define 30 target volumes in the CPBSG for two backup versions.
STORAGE GROUP APPLICATION SELECTION Command ===> To perform Storage Group Operations, Specify: CDS Name . . . 'SYS1.SMS.SCDS' (1 to 44 character data set name or 'Active' ) Storage Group Name cpbsg1 (For Storage Group List, fully or partially specified or * for all) Storage Group Type copy pool backup (VIO, POOL, DUMMY, COPY POOL BACKUP, OBJECT, OBJECT BACKUP, or TAPE) Select one of the following options : 2 1. List - Generate a list of Storage Groups 2. Define - Define a Storage Group 3. Alter - Alter a Storage Group 4. Volume - Display, Define, Alter or Delete Volume Information If List Option is chosen, Enter "/" to select option Respecify View Criteria Respecify Sort Criteria Use ENTER to Perform Selection; Use HELP Command for Help; Use END Command to Exit.
Tip: The physical volume status of all volumes in a CPBSG must be CONVERTED. (The volume is fully converted to SMS.) Otherwise, the volumes will not be selected as target volumes during FRBACKUP processing.
After you define the CPBSG, you must alter your existing pool storage groups to associate the CPBSGs where you want to keep their copies.
Start by selecting option 6 Storage Group - Specify Volume Names and Free Space
Thresholds from the ISMF Primary Option Menu as shown in Figure 3-2 on page 31. The
Storage Group Application Selection panel displays. Specify the Storage Group name that you want and the Storage Group Type of POOL. Then, select option 3 Alter - Alter a Storage
Group (Figure 3-8).
Figure 3-8 Storage Group Application Selection panel: Alter a Storage Group
ThePool Storage Group Alter panel displays. Specify the name of the CPBSG that you want in the Copy Pool Backup SG Name field (Figure 3-9 on page 39).
STORAGE GROUP APPLICATION SELECTION Command ===> To perform Storage Group Operations, Specify: CDS Name . . . 'SYS1.SMS.SCDS' (1 to 44 character data set name or 'Active' ) Storage Group Name SG1 (For Storage Group List, fully or partially specified or * for all) Storage Group Type (VIO, POOL, DUMMY, COPY POOL BACKUP, OBJECT, OBJECT BACKUP, or TAPE) Select one of the following options : 3 1. List - Generate a list of Storage Groups 2. Define - Define a Storage Group 3. Alter - Alter a Storage Group 4. Volume - Display, Define, Alter or Delete Volume Information If List Option is chosen, Enter "/" to select option Respecify View Criteria Respecify Sort Criteria Use ENTER to Perform Selection; Use HELP Command for Help; Use END Command to Exit.
Figure 3-9 Pool Storage Group Alter panel
A pool storage group can have only one CPBSG that is associated with it. Many pool storage groups can be associated with the same CPBSG. So, we can have different versions of different pool storage groups in a CPBSG. DFSMShsm keeps control of the copies that you have.
From the Pool Storage Group Alter panel, you can also alter the SMS storage group status by typing Y in the ALTER SMS Storage Group Status field. Compared with pool type storage groups, the SMS status of CPBSGs is different: SMS status can be only ENABLE or NOTCON.