Managing SAS Storage Link Speed

  • For direct-attached drives:
    • For drives directly connected to the controller, the Managing SAS Storage Link Speed feature lets you change the link speed between the controller and an expander or between the controller and a drive that is directly connected to the controller. All phys in a SAS port can have different link speeds or can have the same link speed. You can select a link speed setting. However, if phys in a SAS port have different link speed settings and if a phy is connected to a drive or an expander, the firmware overrides the link speed setting you have selected and instead uses the common maximum link speed among all the phys.
  • For UBM backplanes:
    • Lane speeds for controllers connected to UBM backplanes cannot be modified.

Perform these steps to change the link speed.

  1. Select More Actions > Manage SAS Storage Link Speed on the Controller dashboard.
    The Manage SAS Storage Link Speed dialog appears.
    • The Phy column displays the system-supported phy link values.

      The phy link values range from 0 through 7.

    • The Status column displays the status of the link speed.
    • The Port Number column displays the port numbers.
    • The Select Link Speed column displays the phy link speeds.
    • The urrent Speed column displays the current negotiated logical link rate of the phy.
    • The Connected Device column displays the device that is connected to the phy.
  2. Select the desired link speed from the Select Link Speed field using the drop-down selector.
    The link speed values are MAX, 3.0Gb/s, 6.0Gb/s, 12.0Gb/s, or 22.5Gb/s.

    By default, the link speed in the controller is set to MAX or the value last saved by you. The 12.0Gb/s link speed is supported for some SAS-3 expanders.

  3. Click Save.
    The link speed value is now reset. The change takes place after you restart the system.