The pair is created when you create the initial copy. All data in the P-VOL on the primary system is copied to the S-VOL on the secondary system. The P-VOL remains available to the host for I/O operations.
Prerequisite information
• The initial copy must be performed from the primary system.
• Pair status of both data volumes must be SMPL.
• S-VOLs must be offline to all hosts.
• The primary and secondary systems and logical paths must be defined.
See Configuring local and remote systems for UR on page 5-3 for more information.
• Journal volumes must be registered to the journals that are associated with pairs. See Registering journal volumes in a journal on page 5-10 for more information.
• If you are creating multiple pairs at the same time, you must specify the number of volumes on which initial copy operations can be performed on concurrently. See Specifying number of concurrent initial/resync copies on page 5-9 for more information.
• If you are creating a UR pair for delta resync, see Prerequisite information for delta resync operation on page B-7.
• Make sure Performance Monitor is stopped.
The following additional information may be useful to you before beginning the procedure:
• You will select the volumes you will pair by the volume's port, GID, and LUN. Make sure to have this information available.
• You will assign master and restore journals to the P-VOL and S-VOL during the operation.
• You will assign a mirror ID to the pair. This identifies the pair within the journal. A mirror refers to the pair within the journal.
To create an initial copy or copies
1. In the Storage Navigator main window, select Actions > Remote Copy
> Universal Replicator > Pair Operations.
2. Click to change the mode from View to Modify.
3. In the tree, select the port of the P-VOL or host group (displayed below the ports).
4. From the list of volumes in the right pane, right-click a volume you want to pair. From the menu that appears, select Paircreate.
Volumes with the pair icon are already used as P-VOLs.
Volumes with the pair icon are already used as S-VOLs.
You can create more than one pair at a time.
Data for the selected volume displays in the P-VOL box. The numbers indicate the volume port, GID, LUN, and volume
One P-VOL displays at a time, even if you selected multiple volumes for pairing.
5. Specify an S-VOL.
Caution: In HUS VM and VSP G1000, LUNs can display in hexadecimal or decimal, while in VSP and USP V/VM LUNs display only as
hexadecimal. And in HUS VM and VSP G1000 secondary windows, LUNs display in decimal only.
When LUNs display in decimals, decimals display even if you change LUN ID Notation in the Edit Information Display Settings window to hexadecimal.
Therefore, when assigning an S-VOL in a VSP and USP V/VM storage system, make sure to convert hexadecimal LUN numbers to decimal
To create one pair, select the port, GID, and LUN from the three S-VOL boxes.
If you selected multiple volumes as P-VOLs and want to create multiple pairs, do one of the following using the Select Other S-VOL(s) list to assign S-VOLs:
- Select Increment to add the secondary system LUN incrementally.
Your S-VOL LUN numbers must be numbered incrementally. For example, if you want to create three pairs and you specified 11 for the first P-VOL LUN, the LUNs on the secondary system are
incremented at 11, 12, and 13.
- Select Input Next to specify each S-VOL LUN for each P-VOL. For example, set the S-VOL LUN for the current P-VOL and click Set, then reopen the dialog box to set the next S-VOL, and so on.
- Select Relative to VOL to add the S-VOL LUN closest to the P-VOL's LUN. For example, if the LUN of the three P-VOLs are 1, 5, and 6, and you select LUN 2 for the first S-VOL, LUN numbers 6 and 7 are assigned by the system as the next two S-VOLs.
6. In the Mirror box, proceed as follows.
a. Select the master journal from the M-JNL list.
b. Select a mirror ID (0 to 3) from the Mirror ID list.
c. Select a restore journal from the R-JNL list. Only journal numbers between 000 and 0FF display.
7. From the CT Group list, specify the consistency group number. If possible, assign the consistency group number matching the Universal Replicator journal number (best practice).
8. In the DKC list, select the secondary system, which must be the same for all pairs created in the operation. Secondary systems are identified in the list by serial number, LDKC number, controller ID, model name, and ID (path group ID).
When the secondary system is USP V/VM, only 0 (default) is available for Path Gr. ID.
If a pair is already created in the mirror being used, this field cannot be changed.
9. In the Initial Copy list, select one of the following:
Entire, to create the UR pair relationship and copy the data from primary to secondary volumes immediately.
None, to create the UR pair relationship but copy no data from primary to secondary volumes. If you select this option, the data in the P-VOL and S-VOL must be identical.
Delta, to create a delta resync pair. Because the P-VOL and S-VOL in this case already contain data, there is no initial copy. Pair status changes to HOLD or HOLDING.
10.In the Priority list, specify the scheduling order for this initial copy operation, if the number of initial copies in the operation is greater than the maximum concurrent copy setting. The default value is 32, and 1 to 256 can be specified.
See Maximum initial copy operations and priorities on page 3-10 if running more initial copies than previously specified.
11.In the Error Level list, select one of the following options for the action to take if a failure occurs during this operation:
Mirror, to split all pairs in the failed pair's mirror. Mirror is the default.
LU, to split only the pair that failed.
12.Click Set to close the Paircreate dialog box.
13.In the Preview list check your settings.
To modify a setting, right click it and select Modify.
To cancel a setting, right click it and select Cancel.
14.Click Apply to apply the settings and create pairs.
15.In the Pair Operation window, verify that the pair status is correct based on the initial copy option:
16.(Optional) You can monitor the progress of the paircreate operation by clicking File > Refresh in the menu bar. This updates the information in the list.
You can also review current pair activity and pair status in the Detailed Information dialog box. See Monitoring pair activity and status on page 7-2 for more information.