Setting a UUID

You can set an arbitrary ID to identify a logical volume from the host when host mode option 33 is set to on. The ID is referred to as the UUID (universally unique identifier) and is typically composed of a Prefix and an Initial Number.

Note the following when setting a UUID:

  • If host mode 05 OpenVMS is used with host mode option 33 set to ON, LUs that do not have UUID settings are inaccessible.
  • If host mode 05 OpenVMS is used with host mode option 33 set to OFF, LUs that have UUID settings are inaccessible.

The following rules apply to setting a UUID:

  • These characters cannot be used for UUID: \ / : , ; * ? " < > |
  • A space character cannot be used as the first or the last character of a UUID.
  • UUID is case-sensitive. For example, Abc and abc are different UUIDs.

To keep track of device information, create a correspondence table similar to the example in Correspondence table for defining devices.

Before you begin

  • The Storage Administrator (Provisioning) role is required to perform this task.
  • Before editing UUID settings, review the information about UUID requirements.

Procedure

  1. Click Storage Systems, and then expand the Storage Systems tree.

  2. Click Ports/Host Groups/iSCSI Targets.

  3. In the Host Groups/iSCSI Targets tab, click the link of the Port ID of the host group.

  4. Click the link of a Host Group Name.

  5. Click the LUNs tab.

  6. Select one or more logical units to which volumes are assigned (if a volume is assigned to an LU, the columns on the right of the LUN column are not empty).

    When multiple LUs are selected, the same UUID is set to all selected LUs.

  7. Click More Actions, and then select Edit UUIDs.

  8. In the Edit UUIDs window, in Prefix, type the UUID.

    If a UUID is already specified, you can change it. The UUID before changing appears in UUID in the Edit UUIDs window. However, if multiple LUs, or N/As are selected, the Prefix box is blank.

    For an OpenVMS server host, enter a UUID composed of a Prefix and an Initial Number. The Prefix may include up to 5 digits, from 1 to 32767, and the Initial Number may include up to 5 digits, from 0 to 32767.

    For a server host other than OpenVMS, enter a UUID composed of a Prefix and an Initial Number. The Prefix may include up to 64 ASCII characters (letters, numerals and symbols) and the Initial Number may include up to 9 digits.

    When changing the server host OS from HP-UX to OpenVMS, or from OpenVMS to HP-UX, the same UUID cannot be used continuously. Clear the UUID setting (see Clearing a UUID setting), and then set the proper UUID for a server host.

  9. To sequentially number the UUIDs, type the first digit in the Initial Number box. The following rules apply to the Initial Number: 

    1: Up to 9 numbers are added (1, 2, 3, ... 9).
08: Up to 92 numbers are added (08, 09, 10, ... 99).
If the host mode is set to OpenVMS, the numbers are as follows:
8, 9, 10, ... 99
23: Up to 77 numbers are added (23, 24, 25, ... 99).

  10. Click Finish.

    The Confirm window appears.

  11. In the Task Name text box, type a unique name for the task or accept the default.

    You can enter up to 32 ASCII characters and symbols, with the exception of: \ / : , ; * ? " < > |. The value "date-window name" is entered by default.

  12. Click Apply.

    If the Go to tasks window for status check box is selected, the Tasks window appears.
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