Creating Thin Image pairs using Device Manager - Storage Navigator
You can create a Thin Image pair and define the pair in a consistency group. You can create a maximum of 1,024 Thin Image pairs at the same time for VSP G1000, and 32,768 for VSP G200, G400, G600, G800. To create more than 1,024 (or 32,768) pairs, repeat this task.
When you create a pair, you specify the pool to be used. A Thin Image pair consists of a P-VOL and up to 1,024 S-VOLs. The MU numbers are assigned in the order of 3 to 1,023, followed by 0 to 2.
After creating a Thin Image pair, the number of pairs shown in the summary section in the Local Replication window and the number of pairs shown in the list in the TI Pairs tab can be different. Wait until the configuration information has completed processing. If the numbers of pairs do not match, reload the configuration information (see Reloading Thin Image configuration information).
To prevent the Thin Image pair from being suspended ("PSUE" status), do not create Thin Image pairs while you are shutting down the storage system.
Requirements:
The P-VOL and S-VOLs you select must be the same size in blocks, if you create a Thin Image pair with an S-VOL specified. If the capacity is displayed in GB or TB, a small difference between P-VOL and S-VOL capacity might not be displayed.
To view the capacity in blocks, click Options > Capacity Unit > block in the Logical Devices window.
If you select a P-VOL that you are already using as the P-VOL for another Thin Image pair, you must specify the same pool for both pairs. For example, if you specify three S-VOLs for one P-VOL, specify the same pool for the three Thin Image pairs.
The value of the T10 PI attribute must be the same for the P-VOL and S-VOL.
Before you begin
You must have the Storage Administrator (Local Copy) role.
If you are sharing ShadowImage volumes with Thin Image volumes, the SI pair must exist.
If you want to use a ShadowImage volume as a Thin Image P-VOL when an available MU number does not exist, you must complete the following:
Deleted the Thin Image pairs of MU numbers 0 to 2.
Created the ShadowImage pair.
Recreated the Thin Image pair with an MU number of 3 or greater assigned.
Procedure
Navigate to the Create TI Pairs wizard.
In Command Suite:
On the Resources tab, click Storage Systems, and then expand the storage system tree.
Right-click the target storage system, and then select Local Replication.
In the Local Replication window, select a P-VOL in the TI Primary Volumes tab or a snapshot group in the Snapshot Groups tab, and then click Create TI Pairs.
In Device Manager - Storage Navigator:
In the Explorer pane, click Storage Systems, expand the storage system tree, expand Replication, and then click Local Replication.
In the Local Replication window, select a P-VOL in the TI Primary Volumes tab or a snapshot group in the Snapshot Groups tab, and then click Create TI Pairs.
In Use Primary Volumes of Thin Image Pairs, select Yes or No.
For Yes, continue to the next step. For No, complete the following:
From the Available Primary Volumes table, select the LDEV you want to assign as the P-VOL.
(VSP G1000 only) Nondisruptive migration volumes do not appear in the Available Primary Volumes table.
Click Select Pool.
In the Select Pool window, select a pool from the Available Pools table.
Click OK.
For Snapshot Group, select either Create New to assign the pair to a new snapshot group, or Use Existing to assign the pair to an existing snapshot group. When you create a Thin Image pair, you must assign it to a snapshot group.
Complete one of the following:
For Create New, enter values for Number of Snapshot Data per Primary Volume, Prefix, and Initial Number, and then select Snapshot Group Configuration.
For Use Existing, select Snapshot Group Configuration, and then select the snapshot group to which you want to assign the pair from the Available Snapshot Groups table. If you select All, enter a value in Number of Snapshot Data per Primary Volume.
To create pairs and assign the pairs to a snapshot group by using CCI, see Creating Thin Image pairs and defining them in snapshot or consistency groups using CCI.
Click Add.
The selected LDEV is moved to the Selected Primary Volumes table.
Click Next.
From the Available LDEVs table, select the LDEV you want to assign as the S-VOL, and then click Set.
The selected LDEV is displayed in the Secondary Volumes column of the Selected Pairs table.
(VSP G1000 only) Nondisruptive migration volumes do not appear in the Available Primary Volumes table.
If you select a capacity in Capacity, the Available LDEVs and Selected Pairs tables display the LDEVs that match the selected capacity.
If you select a row in the Available LDEVs table and a row in the Selected Pairs table, and then click Set, you can configure a pair.
If you select LDEVs which were assigned to an S-VOL with the Exclude Assigned Volumes check box unchecked, you can change the S-VOL to which snapshot data is assigned.
Click Finish, and then confirm the settings.
Accept the default task name or enter a unique name.
You can enter up to 32 letters, numbers, and symbols, except the following:
\ / : , ; * ? " < > |
If you want to monitor the task after submitting it, select Go to tasks window for status.
Click Apply to submit the task.
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