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PSU Configuration

PSU Configuration allows users to set the redundancy mode for power supplies.

Figure 1. PSU Configuration
PSU Configuration
  1. Redundancy Mode: Offer two modes for user to choose.

    • Redundancy Mode
      • No Redundancy: System could be throttled or shut down if one or more power supplies are in faulty condition.

      • N+1: There is one properly installed PSU as redundant power supply, so there is no impact to system operation or performance if any one of the PSUs is in faulty condition, given that Oversubscription mode is not enabled.

      • N+N: Have half of the properly installed PSUs as redundant power supplies, therefore, there is no impact to system operation or performance if any half number of the PSUs has failed, given that Over-subscription mode is not enabled. For example, 6 PSUs properly installed, 3 PSUs could fail without any impact when N+N and no Over-subscription is applied.

    • Over-subscription Mode: Oversubscription Mode allows user to take advantage of the extra power from the redundant power supply when the power supplies are in healthy condition. When the redundancy fails, PSU will shut down within 1 second if system power loading is not corrected after the time limit. FPC takes the action of node throttling at such power emergency. Chassis performance could be impacted even in redundancy mode if oversubscription is also enabled.

      • Oversubscription is applied only with N+1 or N+N redundancy modes.

      • When enabled with N+1, the total power available is equivalent to No Redundancy mode.

    • Click on Apply after choosing the redundancy and oversubscription mode from drop-down menu to activate.

  2. Smart Redundancy: Three scanning period are offered: 10/30/60 minutes. The shorter the scanning period, the faster FPC adjusts number of hibernate PSUs to optimize PSU efficiency when system load changes. With shorter scanning period, PSU are also turned on and off more frequently when system loading fluctuates, which could reduce PSU life. Disable smart Redundancy will keep all PSU always active. Click on Apply after choosing the scanning period from drop-down menu to apply selections.


    CFFv1 PSU (900w) does not support this feature. Smart Redundancy will always be in Disable state and the Apply button will be greyed out when 900w PSU is installed