Splitting Thin Image Advanced pairs to store snapshot data

Thin Image Advanced User Guide
Version
9.8.6
Audience
anonymous
Part Number
MK-98RD9033-00

This topic explains how to split pairs. Splitting pairs stores snapshot data.

A maximum of 1,024 snapshots can be stored for one root volume. If you reach the maximum, delete the unneeded or unused snapshots.

Note: If the amount of snapshot data in selected P-VOLs or the total number of pairs in selected snapshot groups exceeds 37,768, an error message appears when attempting to perform pair tasks.
Note: Snapshot data cannot be stored when the pool is full. Increase the available pool capacity, and then store snapshot data.
  • You must have the Storage Administrator (Local Copy) role.
  • The Thin Image Advanced pair status must be "PAIR".
You can split pairs using CCI or HDvM - SN.

Splitting pairs using CCI commands

You can use the raidcom modify snapshot command with either the -snapshot_data create or the -snapshot_data_split option.

The following is an example of storing snapshot data of the P-VOL (LDEV number 10:10) contained in the snapshot group (db1):

raidcom modify snapshot -ldev_id 0x1010 -snapshotgroup db1
-snapshot_data create
Note: You can also store snapshot data by specifying -snapshot_data split instead of -snapshot_data create. The operation is the same for both options.

The following is an example of storing snapshot data of the P-VOL (LDEV number 10:10) of MU number 10:

raidcom modify snapshot -ldev_id 0x1010 -mirror_id 10
-snapshot_data create

The following is an example of storing snapshot data by specifying an S-VOL (LDEV number 20:10):

raidcom modify snapshot -ldev_id 0x2010 -snapshot_data create

The following is an example of storing snapshot data of all P-VOLs contained in the snapshot group (db1):

raidcom modify snapshot -snapshotgroup db1 -snapshot_data create

Splitting pairs using HDvM - SN

  1. In the Explorer pane, click Storage Systems, expand the storage system tree, expand Replication, and then click Local Replication.
  2. In the Local Replication window, select a P-VOL in the TI Root Volumes tab or a snapshot group in the Snapshot Groups tab.
  3. Click Operate TI Pairs.
  4. In the TI Pairs window, specify the pair you want to split and then click Split Pairs.
    You can specify P-VOLs in Device Manager - Storage Navigator until the total number of snapshots reaches 32,768. You can also specify snapshot groups until the total number of pairs reaches 32,768. For cascaded pairs with layers, start with pairs at the higher layers.
  5. Click Finish, and then confirm the settings.
  6. Accept the default task name or enter a unique name.
    You can enter up to 32 letters, numbers, and symbols, except the following:

    \ / : , ; * ? " < > |

  7. If you want to monitor the task after submitting it, select Go to tasks window for status.
  8. Click Apply to submit the task.