Changing the priority of an SPM group

All host bus adapters in one PFC group must have the same priority. Prioritized WWNs and non-prioritized WWNs cannot be mixed in one PFC group.

You can use an SPM group to change the priority of multiple HBAs between prioritized and non-prioritized.

You can perform the upper-limit value control for the an SPM group by setting the upper-limit value on the an SPM group .

Note

The upper-limit value of each HBA which belongs to the PFC group is the upper-limit value set for the PFC group divided by the number of HBAs which belong to the PFC group and have I/O.

The I/O existence in HBA is distinguished with one minute interval monitoring. The upper-limit value of HBAs which belong to the PFC group is updated in one minute interval.

So, when the existence of I/O is alternated the upper-limit value of PFC group might be over or under the setting value.

For example, in the condition that the upper-limit value is set 200 IOPS for the PFC group which 2 HBAs belong to and only 1 HBA has I/O, the upper-limit value allocated to each HBA is 200 (200 ÷ 1) IOPS. After that, if the number of HBAs which have I/O turns from 1 to 2, until the next detection (updating of HBA upper-limit value which belongs to the PFC group is in one minute interval), the upper-limit value might become 400 (200+200) IOPS because the upper-limit value is allocated 200 IOPS to each HBA. That is over the setting value for the PFC group.

Or, in the condition that the upper-limit value is set 200 IOPS for the PFC group which 2 HBAs belong to and 2 HBAs have I/O, the upper-limit value allocated to each HBA is 100 (200 ÷ 2) IOPS. After that, if the number of HBAs which have I/O turns from 2 to 1, until the next detection (updating of HBA upper-limit value which belongs to the PFC group is in one minute interval), the upper-limit value might become 100 IOPS because the upper-limit value is allocated 100 IOPS to each HBA. That is under the setting value for the PFC group.

Before you begin

  • Required role: Storage Administrator (System Resource Management)
  • You must enable the Device Manager - Storage Navigator secondary window. For details, see the System Administrator Guide of your storage system.

Procedure

  1. Click Reports Performance Monitor Server Priority Manager to open the Server Priority Manager window.

  2. Click to change to Modify mode.

  3. In the Server Priority Manager window, click Server Priority Manager. The Server Priority Manager main window appears.

  4. Select the WWN tab.

  5. In the lower-left tree, select and right-click the desired PFC group ().

  6. Change the priority:

    • To change priority from prioritized to non-prioritized, select Prio - Non-Prio from the pop-up menu.
    • To change priority from non-prioritized to prioritized, select Non-Prio - Prio from the pop-up menu.

  7. Click Apply to apply the settings to the storage system.

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