Changing options used by journals

Most Universal Replicator pair operations are performed on multiple pairs, which is done using journals. You can change options that affect the pairs in journals.

You can control the following aspects of pair operations:

  • Inflow Control: Allows you to restrict the inflow of data to allow other journals with higher priority data unrestricted inflow when the data transfer path accessing two journals is set.
  • Data Overflow Watch: Establishes a timeout period.

    In a 3DC multi-target configuration in which three UR sites are combined, if the status of the two mirrors in the primary site is both Active and the free space in the journal data area or metadata area is less than a certain amount, one of the mirrors in the journal will be suspended by error, regardless of the value in Data Overflow Watch.

  • Cache Mode: Allows you to use journal data in the cache on the secondary storage system.

Before you begin

  • Journal options must be changed on both storage systems, primary and secondary.
  • To change journal options, one of the following conditions must be satisfied:

    - The attribute of the journal is Initial.

    - The status of the journal in the mirror is one of the following:

    • Initial
    • Stopped
    • Hold
    • Holding
    • Hold(Failure)

    When one journal uses multiple mirrors, whether you can select Change Journal Option depends on the status of the journal whose mirror is not in Hold, Holding or Hold(Failure) status. For example, if mirrors in the journal are in the Hold and Active status, you cannot change the journal option. If mirrors in the journal are in the Hold and Stopped status, you can change the journal option.

  • When changing options for multiple journals, you can leave some options unchanged by entering or selecting no value. If you specify a value, it is applied to the selected journals.

In CCI, use the raidcom modify journal command.

Procedure

  1. In the Explorer pane, expand the Storage Systems tree.

  2. Expand the target storage system tree, expand Replication, and click Journals.

  3. In the Journals tab, select the journal whose options you want to change.

  4. Click Edit Journal Options.

  5. In the Edit Journal Options dialog box, change the following options as needed.

    • Inflow Control
    • Data Overflow Watch
    • Cache Mode
    For descriptions, see the procedure in Creating journals and adding journal volumes .

  6. Click Finish.

  7. In the Confirm window, review the settings and enter a task name in the Task Name box.

  8. Click Apply to save your settings to the system.

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