Allowing the Host to Control the Timestamp

By default, the clock in each VSAN is the same as the switch hardware clock. Each VSAN in a Cisco MDS 9000 Family switch represents a virtual director. The clock and time present in each virtual director can be different.To maintain separate clocks for each VSAN, the Cisco NX-OS software maintains the difference of the VSAN-specific clock and the hardware-based director clock. When a host (mainframe) sets the time, the Cisco NX-OS software updates this difference between the clocks. When a host reads the clock, it computes the difference between the VSAN-clock and the current director hardware clock and presents a value to the mainframe.

Detailed Steps

To configure host (mainframe) control for the VSAN time stamp, follow these steps:

  1. Choose VSAN > FICON.

    2. You see a list of switches under the Control tab in the Information pane.

  2. Click the VSANs tab.

    3. You see the FICON VSAN configuration information in the Information pane.

  3. Check the Host Can Sync Time checkbox to allow the mainframe to set the system time on the switch.
  4. Click the Apply Changes icon to save these changes.

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